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Article

Silver(I) 2,2'-(1,2-Phenylenedisulfanediyl)diacetic Acid as a Molecular Building Block for a Silver(I)-Cadmium(II) Coordination Polymer

by
Ioana Georgeta Grosu
1,2,†,
Christiane Berghof
1,†,
Peter Lönnecke
1,
Luminita Silaghi-Dumitrescu
2 and
Evamarie Hey-Hawkins
1,*
1
Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
2
Department of Chemistry, Babeş-Bolyai University, Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Molecules 2015, 20(5), 8020-8032; https://doi.org/10.3390/molecules20058020
Submission received: 29 March 2015 / Revised: 23 April 2015 / Accepted: 28 April 2015 / Published: 4 May 2015
(This article belongs to the Special Issue Metal-Organic Frameworks: Chemistry and Applications)
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Versions Notes

Abstract

:
Starting from heterotopic multidentate ligand 2,2'-(1,2-phenylenedisulfanediyl)diacetic acid, (RS,RS,RS,RS/SS,SS,SS,SS)-[Ag{1,2-C6H4(SCH2COOH)2-κ2S,S'}2]BF4 (1) was prepared and further used as a building block for the synthesis of heterobimetallic Ag-Cd coordination polymer [Ag2Cd2{1,2-(OOCCH2S)2C6H4}3(H2O)3 5H2O]n (2). Both complexes were characterized by X-ray structure analysis and conventional spectroscopic techniques.

Graphical Abstract

1. Introduction

Although the chemistry of coordination polymers has received much attention during the last decade, not only due to their interesting architectures [1] but also because of their potential applications in gas storage [2,3,4], nonlinear optics [5,6], or catalysis [7,8], and interesting magnetic [9,10] or luminescence [11] properties, the synthesis of such polymers with predictable geometries and structures is still a challenge [12,13]. Increasing attention has been paid in recent years to rational synthetic approaches for the assembly of target structures [14,15]. The key step of this approach is the design of molecular building blocks which can direct the formation of the desired architecture and functionality of the target compound.
Platinum(II) [16], manganese(II) [17,18,19], rhodium(II) [20], and copper(I) [21] complexes with bifunctional ligands were successfully used as “metalloligands” for rational construction of coordination polymers. Furthermore, heterobimetallic coordination polymers (e.g., Ln-Ba, Ln-Na, and Ln-Ca) that retain the luminescence properties of the mononuclear Ln complexes used as starting materials were obtained by a stepwise approach [22,23]. Nanoporous heterobimetallic Cd-Ag and heterotrimetallic Zn-Cd-Ag polymers were prepared from tris-chelate metalloligands (Cd, Zn) with 1,3-bis(4'-cyanophenyl)-1,3-propanedione as multifunctional chelate ligand and silver(I) salts [24]. Two one-dimensional heterotrimetallic Zn-Cd-Ag polymers with dicyanoargentate(I) bridges were obtained from a mixture of the metal salts and the nitronyl nitroxide radical ligand [25]; similarly, the mixed-ligand Ag-Cd heterometallic coordination polymer poly[bis(μ3-thiocyanato-κ3N,S,S')(μ2-thiocyanato-κ2N,S)(4'-p-tolyl-2,2':6',2''-terpyridine-κ3N,N',N'')cadmium(II)silver(I)] was obtained from the corresponding metal salts and 4'-p-tolyl-2,2':6',2"-terpyridine [26].
Here, we report the synthesis of a mononuclear silver(I) complex from heterotopic multidentate ligand 2,2'-(1,2-phenylenedisulfanediyl)diacetic acid, which was further used as a molecular building block for the synthesis of a Ag-Cd heterobimetallic coordination polymer.

2. Results and Discussion

2.1. Synthesis of 1 and 2

With the goal of obtaining heterobimetallic coordination polymers through rational synthesis, the monomeric silver(I) complex of 2,2'-(1,2-phenylenedisulfanediyl)diacetic acid was prepared by heating the ligand with AgBF4 (2:1) in tetrahydrofuran (thf) for five minutes. The ligand 2,2'-(1,2-phenylenedisulfanediyl)diacetic acid coordinates via both sulfur atoms in a chelating manner, leaving the carboxyl groups uncoordinated. Thus, it should be possible to employ complex 1 as a building block to construct extended networks. Accordingly, 1 reacts with Cd(OAc)2 3H2O (1:1) in dmf:H2O:MeOH (1:2:2.5) at room temperature for one hour to give heterobimetallic Ag-Cd coordination polymer 2 (Scheme 1).
Complex 1 was characterized by 1H, 11B{1H}, 19F{1H}, 13C{1H} NMR and IR spectroscopy and elemental analysis, and insoluble polymer 2 by IR spectroscopy and elemental analysis. Furthermore, single crystals suitable for X-ray crystallography could be obtained for both compounds.
Molecules 20 08020 g006 550
Scheme 1. Synthesis of 1 and 2.
Scheme 1. Synthesis of 1 and 2.
Molecules 20 08020 g006

2.2. Molecular Structures of 1 and 2

Suitable crystals of 1 for X-ray structure analysis were obtained from thf at −20 °C. Complex 1 crystallizes in the tetragonal space group P 4 ¯ n2 with two molecules in the unit cell. In addition, eight thf molecules are also present in the unit cell. The structural motif of the [Ag{1,2-C6H4(SCH2COOH)2-κ2S,S'}2]+ cation in monomeric complex 1 is a distorted AgS4 tetrahedron with small S(1)–Ag(1)–S(1') bite angles (83.67(3)°) and large adjacent S(1)–Ag(1)–S(1'') (140.05(3)°) and S(1)–Ag(1)–S(1''') (110.10(3)°) bond angles. The metal center is located on a special position (three C2 axes) with site symmetry (222) [27] (Figure 1, Table 1).
Molecules 20 08020 g001 550
Figure 1. Molecular structure and atom labeling scheme for the silver complex cation in 1. Each acetic acid proton (H1O) is hydrogen-bonded to a thf molecule. The BF4− anion, CH protons, and noncoordinating thf molecules are omitted for clarity.
Figure 1. Molecular structure and atom labeling scheme for the silver complex cation in 1. Each acetic acid proton (H1O) is hydrogen-bonded to a thf molecule. The BF4− anion, CH protons, and noncoordinating thf molecules are omitted for clarity.
Molecules 20 08020 g001
Table
Table 1. Selected bond lengths (Å) and angles (°) in 1.
Table 1. Selected bond lengths (Å) and angles (°) in 1.
Ag(1)–S(1)2.5518(8)S(1)–Ag(1)–S(1')83.67(3)
S(1)–C(1)1.778(3)S(1)–Ag(1)–S(1'')140.05(3)
S(1)–C(4)1.805(3)S(1)–Ag(1)–S(1''')110.10(3)
F(1)–B(1)1.343(3)F(1)–B(1)–F(1')109.8(1)
O(1)–C(5)1.307(4)
O(1)–H(1o)0.82(5)
O(2)–C(5)1.182(4)
O(3)–C(9)1.394(7)
O(3)–C(6)1.427(8)
A distorted tetrahedral coordination geometry of silver ions was also observed in the related homoleptic discrete silver(I) complex cations [Ag{1,2-C2H4(SCH2Ph)2-κ2S,S'}2]+ (Ag–S 2.590(1) to 2.604(1) Å, S–Ag–S bite angles 85.17(5) and 86.58(5)°) [28] and [Ag{1,2-C2H4(SCH2CH2CH2COOH)2-κ2S,S'}2]+ (Ag–S 2.55(2) to 2.60(2) Å, S–Ag–S bite angle 86(1)°) [29]. The Ag(1)–S(1) bond length in 1 (2.5518(8) Å) is in the range of reported values [21,22,30]. The five-membered AgS2C2 rings are almost planar (deviation of C(1) and C(1') from plane: 0.02 Å). The sulfur atoms are in a tetrahedral environment (three substituents and one lone pair of electrons) and are thus chiral. Due to the presence of three perpendicular C2 axes at the silver center, all four sulfur atoms have the same configuration (either all R or all S).
The four carboxyl groups are noncoordinating, but each forms hydrogen bonds with one thf molecule (O(3)···H(1O) 1.80(5) Å, O(3)···O(1) 2.608(5) Å, O(3)···H(1O)–O(1) 174(5)°) (Figure 1). The BF4− anion is located on a fourfold inversion axis with ideal tetrahedral symmetry.
Colorless crystals of 2 were obtained at room temperature in three days from a solvent mixture of dmf, MeOH, and H2O. Polymer 2 crystallizes in the monoclinic space group P21 with two formula units in the unit cell. Five water molecules are present in the asymmetric unit.
Polymer 2 contains three types of C6H4(SCH2COO)22− anions (Figure 2) which differ from each other in their coordination mode with the metal ions (Cd2+ is exclusively coordinated by oxygen, whereas Ag+ is preferably coordinated by sulfur), as well as in the deviation of the SCH2COO groups from the plane of the benzene ring. The silver ions are no longer coordinated in a chelating fashion by four sulfur atoms of two neutral ligands but by three sulfur atoms from three different C6H4(SCH2COO)22− dianions and by one carboxylate oxygen atom.
In type 1, the C6H4(SCH2COO)22− anion acts as a tetradentate ligand, bridging two silver and two cadmium ions. Each sulfur atom coordinates to a silver ion. One of the silver ions is also coordinated in a chelating fashion by one carboxylate oxygen atom, which also coordinates to a cadmium ion. The second cadmium ion is coordinated by an oxygen atom from the second carboxylate group. One SCH2COO group is almost coplanar with the benzene ring, while the other is located out of the plane, and torsion angles Caryl–S–Calkyl–C are 169.16(1)° and –85.94(1)°, respectively. The type 2, a hexadentate C6H4(SCH2COO)22− anion bridges two silver and four cadmium ions, each oxygen atom being involved in coordination with a different cadmium ion, while each sulfur atom coordinates to a silver ion. Like in type 1, only one SCH2COO group is almost coplanar with the plane of the benzene ring, and the torsion angles Caryl–S–Calkyl–C are 165.04(1)° and –68.38(1)°. In the third type of coordination, type 3, the C6H4(SCH2COO)22− anion acts as a pentadentate ligand bridging two silver and two cadmium ions. Each sulfur atom coordinates to a silver ion. One of the silver ions is also coordinated in a chelating fashion by one carboxylate oxygen atom, and the second oxygen atom of this carboxylate group coordinates to a cadmium ion. The second cadmium ion is coordinated by an oxygen atom from the second carboxylate group. Again, one SCH2COO group is almost coplanar with the benzene ring, while the other is located out of the plane, and the torsion angles Caryl–S–Calkyl–C are –175.14(1)° and 81.22(1)°, respectively.
Molecules 20 08020 g002 550
Figure 2. Observed coordination modes of C6H4(SCH2COO)22− in polymer 2: tetradentate ligand (type 1), hexadentate (type 2), or pentadentate (in type 3).
Figure 2. Observed coordination modes of C6H4(SCH2COO)22− in polymer 2: tetradentate ligand (type 1), hexadentate (type 2), or pentadentate (in type 3).
Molecules 20 08020 g002
In 2, two types of Cd2+ ions (Cd(1) and Cd(2)) and two types of Ag+ ions (Ag(1) and Ag(2)) are present. The Cd(1) ions are pentacoordinated in a square-pyramidal fashion by three carboxylate oxygen atoms from three different C6H4(SCH2COO)22− anions and by two oxygen atoms from two coordinating water molecules. The Cd(2) ions are hexacoordinated in a distorted octahedral fashion by four carboxylate oxygen atoms from four different C6H4(SCH2COO)22− anions and two oxygen atoms from two coordinating water molecules. The Cd(1) and Cd(2) ions are bridged by one oxygen atom (O(14)) from a water molecule which coordinates to both metal ions (Figure 3, Table 2). The Cd–Ocarboxylate bond lengths range from 2.255(2) to 2.295(2) Å and are in agreement with those observed for similar compounds [31,32,33]. The Cd–Owater bond lengths vary from 2.247(2) Å (Cd(1)–O(13)) and 2.268(3) Å (Cd(2)–O(15)) for the terminal water molecules to 2.301(2) Å (Cd(1)–O(14)) and 2.344(2) Å (Cd(2)–O(14)) for the bridging water molecule.
Molecules 20 08020 g003 550
Figure 3. Coordination environments of the silver and cadmium ions and atom labeling in 2. Hydrogen atoms other than O–H and the noncoordinating water molecules were omitted for clarity.
Figure 3. Coordination environments of the silver and cadmium ions and atom labeling in 2. Hydrogen atoms other than O–H and the noncoordinating water molecules were omitted for clarity.
Molecules 20 08020 g003
Table
Table 2. Selected bond lengths (Å) and angles (°) in 2.
Table 2. Selected bond lengths (Å) and angles (°) in 2.
Cd(1)–O(1)2.282(2)O(1)–Cd(1)–O(7)76.97(7)
Cd(1)–O(6')2.255(2)O(6')–Cd(1)–O(13)90.66(8)
Cd(1)–O(7)2.295(2)O(7)–Cd(1)–O(13)162.48(8)
Cd(1)–O(9')2.275(2)O(7)–Cd(1)–O(9)79.70(7)
Cd(1)–O(13)2.247(2)O(9)–Cd(1)–O(13)91.32(8)
Cd(1)–O(14)2.301(2)O(13)–Cd(1)–O(14)107.07(8)
Cd(2)–O(3')2.263(2)O(3')–Cd(2)–O(8)176.54(8)
Cd(2)–O(5')2.319(2)O(3')–Cd(2)–O(11')92.15(8)
Cd(2)–O(8)2.289(2)O(3')–Cd(2)–O(15)97.57(1)
Cd(2)–O(11')2.260(2)O(5')–Cd(2)–O(8)91.68(8)
Cd(2)–O(14)2.344(2)O(8)–Cd(2)–O(15)82.73(1)
Cd(2)–O(15)2.268(3)O(11')–Cd(2)–O(14)174.21(8)
Ag(1)–O(12)2.434(2)O(12)–Ag(1)–S(1)97.80(5)
Ag(1)–S(1)2.534(8)O(12)–Ag(1)–S(3)124.95(5)
Ag(1)–S(3)2.571(7)S(1)–Ag(1)–S(3)116.24(2)
Ag(1)–S(6)2.592(8)S(1)–Ag(1)–S(6)126.86(2)
Ag(2)–O(1)2.482(2)O(1)–Ag(2)–S(4)118.42(6)
Ag(2)–S(2)2.604(8)O(1)–Ag(2)–S(2)73.15(5)
Ag(2)–S(4)2.548(7)S(2)–Ag(2)–S(5'))120.37(2)
Ag(2)–S(5')2.527(7)S(4)–Ag(2)–S(2)106.58(2)
Both silver ions Ag(1) and Ag(2) are tetracoordinated in a distorted trigonal-pyramidal fashion by two sulfur atoms from two different C6H4(SCH2COO)22− and by one sulfur atom and one carboxylate oxygen atom from a third dicarboxylate anion. The ions Ag(1) and Ag(2) are bridged by two sulfur atoms of the same ligand molecule (Ag(1)···Ag(2) 4.350(1) Å). The Ag–S bond lengths (2.527(7) Å to 2.604(8) Å) are in the same range as those of the starting material 1 (2.552(8) Å). The Ag–O bonds (2.434(2) Å and 2.482(2) Å) are shorter than those observed in catena-[(μ2-benzene-1,3-dicarboxylato)-bis(μ2-3,3',5,5'-tetramethyl-4,4'-bipyrazole)disilver(I)] (2.615(2) Å and 2.672(2) Å) [34].
The structure extends to a two-dimensional network parallel to the C face (Figure 4). The water molecules of solvation interconnect the two-dimensional sheets via hydrogen bonding, giving rise to a three-dimensional supramolecular network (Figure 5a,b). The five noncoordinating water molecules are involved in hydrogen bonding between themselves (H···O 1.69 Å to 1.93 Å and O···O 2.649(5) Å to 2.870(5) Å), with the water molecules coordinated to the cadmium ions (H(30O)···O(17) 1.93 Å, H(31O)···O(18) 1.69 Å, O(15)–H(30O)···O(17) 2.894(5) Å, O(15)–H(31O)···O(18) 2.649(5) Å), and also with carboxylate hydrogen atoms which belong to different sheets (H···O 1.81 Å to 2.07 Å and O···O 2.752(5) Å to 3.018(4) Å).
Molecules 20 08020 g004 550
Figure 4. Two-dimensional layered structure of 2, viewed along the a axis.
Figure 4. Two-dimensional layered structure of 2, viewed along the a axis.
Molecules 20 08020 g004
Molecules 20 08020 g005a 550Molecules 20 08020 g005b 550
Figure 5. Three-dimensional hydrogen-bonded network of 2 (dashed lines) (a) with atom labeling and (b) with coordination polyhedra (blue-gray polyhedra denote the coordination environment of cadmium ions, and violet polyhedra the coordination environment of the silver ions).
Figure 5. Three-dimensional hydrogen-bonded network of 2 (dashed lines) (a) with atom labeling and (b) with coordination polyhedra (blue-gray polyhedra denote the coordination environment of cadmium ions, and violet polyhedra the coordination environment of the silver ions).
Molecules 20 08020 g005aMolecules 20 08020 g005b

3. Experimental Section

3.1. General Procedures

All manipulations for the synthesis of compound 1 were carried out in an inert atmosphere of dry nitrogen and in the absence of light; the synthesis of 2 was performed in air. 2,2'-(1,2-Phenylenedisulfanediyl)diacetic acid [35,36] was prepared according to literature methods; AgBF4 and Cd(OAc)2 3H2O were commercially available. The thf was dried over sodium/benzophenone, distilled under an atmosphere of dry argon, and stored over potassium mirror. CD3OD for NMR spectroscopy was kept in an inert atmosphere of dry argon over molecular sieves. The NMR spectra were recorded on a Bruker Avance DRX-400 spectrometer. Chemical shifts are quoted in ppm relative to tetramethylsilane. Elemental analysis was performed with a Vario EL-Heraeus microanalyzer. IR spectra were recorded with a Perkin-Elmer System 2000 in the range 4000–400 cm−1 in KBr pellets.

3.2. Synthesis of (RS,RS,RS,RS/SS,SS,SS,SS)-[Ag{1,2-C6H4(SCH2COOH)2-κ2S,S'}2]BF4 (1)

A solution of AgBF4 (0.21 g, 1.08 mmol) in thf (20 mL) was added dropwise over a period of 5 min to a solution of 2,2'-(1,2-phenylenedisulfanediyl)diacetic acid (0.63 g, 2.44 mmol) in thf (15 mL). The reaction mixture was heated to reflux for 5 min. The solvent volume was reduced in vacuum to yield a white precipitate. Recrystallization from thf under a nitrogen atmosphere at −20 °C gave 1 (0.41 g, 38%) as air-stable colorless crystals. M.p. 73 °C. Elemental Anal. Calc. for C20H20AgBF4O8S4·4thf: C 43.25; H 5.24. Found: C 39.66; H 4.74%. The lower values indicate loss of thf (calculated for C20H20AgBF4O8S4·2thf: C 39.31; H 4.24) as was also observed by 1H-NMR spectroscopy. 1H-NMR (CD3OD): δ = 1.86 (m, 8H, CH2 in thf), 3.72 (m, 8H, CH2 in thf), 3.96 (s, 8H, SCH2), 7.44 (d, 4H, CH), 7.77 (d, 4H, CH). 13C{1H} NMR (CD3OD): δ = 25.1 (s, CH2 in thf), 38.8 (s, SCH2), 67.5 (s, CH2 in thf), 129.5 (s, CH), 133.0 (s, CH), 134.4 (s, SC), 170.7 (s, COOH). IR (KBr, cm−1): v ˜ = 3440 (s, ν(O–H)), 2951 (s), 1705 (s, ν(C=O)), 1568 (w), 1431 (m), 1386 (m), 1318 (s), 1043 (s, ν(B-F)), 902 (m), 810 (m), 755 (s), 668 (m).

3.3. Synthesis of [Ag2Cd2{1,2-(OOCCH2S)2C6H4}3(H2O)3.5H2O]n (2)

A solution of complex 1 (0.20 g, 0.28 mmol) and Cd(OAc)2 3H2O (0.075 g, 0.26 mmol) in a mixture of dmf (4 mL), MeOH (10 mL), and H2O (8 mL) was stirred at room temperature for one hour. The reaction mixture was filtered and the resulting solution was kept unsealed in air. Colorless crystals of 2 (0.12 g, 44%) were formed in three days. The crystals were isolated by filtration and washed twice with H2O (10 mL). Elemental Anal. Calc. for C30H30Ag2Cd2O15S6.5H2O: C: 26.62; H: 2.98. Found: C: 25.68; H: 2.50%. IR (KBr, cm−1): v ˜ = 3451 (s, ν(O–H)), 2930 (w, ν(CH)), 2364 (w), 2057 (w), 1620 (m), 1477 (w), 1384 (m, ν(C–O)), 1224 (w), 1042 (w), 900 (w), 813 (m), 754 (m), 691 (w), 638 (m), 561 (m), 523 (m).

3.4. X-ray Structure Determination

Data for 1 were collected on a Siemens CCD diffractometer (SMART) [37] in ϕ-scan mode using MoKα radiation (λ = 0.71073 Å). Data reduction was performed with SAINT [38], including the program SADABS [39] for empirical absorption correction. Data for 2 were collected on a CCD Gemini diffractometer (Agilent Technologies) in ω-scan mode using MoKα radiation (λ = 0.71073 Å). Data reduction was performed with CrysAlis Pro including analytical numeric absorption correction using a multifaceted crystal model based on expressions derived by Clark and Reid [40]. All structures were solved by direct methods [41,42] and the refinement of all atoms was performed with SHELXL-97 [31]. With the exception of thf molecules, all hydrogen atoms for 1 were located in difference Fourier maps calculated at the final stage of structure refinement. For 2, all H atoms except those of the water molecules H2O(13) and H2O(14) were calculated on idealized positions. Structure figures were generated with ORTEP [43] and DIAMOND-3 [44]. CCDC 877467 (1) and 877468 (2) contain the supplementary crystallographic data for this paper [45]. A summary of the data collection, structure solution, and refinement details for compounds 1 and 2 is given in Table 3.
Table
Table 3. Data collection, structure solution, and refinement details for compounds 1 and 2.
Table 3. Data collection, structure solution, and refinement details for compounds 1 and 2.
12
Empirical formulaC20H20AgBF4O8S4 4thfC30H30Ag2Cd2O15S6 5H2O
M/g mol−1999.701353.52
T/K213(2)130(2)
Crystal systemtetragonalmonoclinic
Space group P 4 ¯ n2P21
a/Å12.0071(6)7.6790(1)
b/Å12.0071(6)24.2111(3)
c/Å15.219(1)11.7500(2)
α/°9090
β/°90102.175(1)
γ/°9090
V/Å32194.1(2)2135.39(5)
Z22
Dcalcd/Mg m−31.5132.105
μ/mm−10.7232.256
F(000)10321332
Reflections collected1108848203
Independent reflections2238 [R(int) = 0.0209]12977 [R(int) = 0.0290]
Restraints/parameters0/1528/557
Goodness of fit on F21.0610.985
Final R indices [I > 2 σ(I)]R1 = 0.0310R1 = 0.0227
wR2 = 0.0756wR2 = 0.0519
R indices (all data)R1 = 0.0379R1 = 0.0255
wR2 = 0.086wR2 = 0.0524
Largest diff. peak and hole/e Å−30.241 and −0.1862.186 and −0.759
Absolute structure parameter−0.01(4)–0.02(1)

4. Conclusions

The reaction of 2,2'-(1,2-phenylenedisulfanediyl)diacetic acid with AgBF4 produced mononuclear silver(I) complex 1, which was further used as a building block for the synthesis of two-dimensional heterobimetallic Ag-Cd coordination polymer 2. In the discrete silver(I) complex cation in 1, the four COOH groups are not coordinated to the metal center but are involved in hydrogen bonding with one thf molecule each. In 2, the water molecules of solvation interconnect the two-dimensional sheets via hydrogen bonding, giving rise to a three-dimensional supramolecular network.

Acknowledgments

We gratefully acknowledge support from COST Action CM1302 SIPs and financial support from the Deutscher Akademischer Austausch Dienst (DAAD, sandwich-PhD scholarship and SOE programme) (I.G.G.). C.B. thanks the Friedrich-Ebert Foundation for a PhD scholarship.

Author Contributions

CB prepared compound 1 and analyzed the data; IGG prepared compound 2, analyzed the data and prepared the first draft of the manuscript; PL performed X-ray crystallography and analyzed the data; LSD analyzed the data and prepared the manuscript; EHH designed research, analyzed the data and prepared the manuscript. All authors read and approved the final manuscript.

Conflicts of Interest

The authors declare no conflict of interest.

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MDPI and ACS Style

Grosu, I.G.; Berghof, C.; Lönnecke, P.; Silaghi-Dumitrescu, L.; Hey-Hawkins, E. Silver(I) 2,2'-(1,2-Phenylenedisulfanediyl)diacetic Acid as a Molecular Building Block for a Silver(I)-Cadmium(II) Coordination Polymer. Molecules 2015, 20, 8020-8032. https://doi.org/10.3390/molecules20058020

AMA Style

Grosu IG, Berghof C, Lönnecke P, Silaghi-Dumitrescu L, Hey-Hawkins E. Silver(I) 2,2'-(1,2-Phenylenedisulfanediyl)diacetic Acid as a Molecular Building Block for a Silver(I)-Cadmium(II) Coordination Polymer. Molecules. 2015; 20(5):8020-8032. https://doi.org/10.3390/molecules20058020

Chicago/Turabian Style

Grosu, Ioana Georgeta, Christiane Berghof, Peter Lönnecke, Luminita Silaghi-Dumitrescu, and Evamarie Hey-Hawkins. 2015. "Silver(I) 2,2'-(1,2-Phenylenedisulfanediyl)diacetic Acid as a Molecular Building Block for a Silver(I)-Cadmium(II) Coordination Polymer" Molecules 20, no. 5: 8020-8032. https://doi.org/10.3390/molecules20058020

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