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Crystals, Volume 5, Issue 2 (June 2015), Pages 172-274

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Editorial

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Open AccessEditorial Crystals Best Paper Award 2015
Crystals 2015, 5(2), 273-274; doi:10.3390/cryst5020273
Received: 2 June 2015 / Revised: 2 June 2015 / Accepted: 4 June 2015 / Published: 5 June 2015
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Abstract
An annual award has been instituted to recognize the outstanding papers published in Crystals. We are pleased to announce the first “Crystals Best Paper Award” for 2015. [...] Full article
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Research

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Open AccessArticle Synthesis of Framework Isomer MOFs Containing Zinc and 4-Tetrazolyl Benzenecarboxylic Acid via a Structure Directing Solvothermal Approach
Crystals 2015, 5(2), 193-205; doi:10.3390/cryst5020193
Received: 29 November 2014 / Revised: 9 February 2015 / Accepted: 16 February 2015 / Published: 2 April 2015
Cited by 2 | PDF Full-text (639 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The solvothermal synthesis of framework isomers was carried out using the hybrid carboxylate and tetrazolate functional ligand, 4-tetrazolyl benzenecarboxylic acid (H2TBC, TBC = 4-tetrazolyl benzenecarboxylate) and zinc. H2TBC was also synthesized with the solvothermal approach, and is referred herein
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The solvothermal synthesis of framework isomers was carried out using the hybrid carboxylate and tetrazolate functional ligand, 4-tetrazolyl benzenecarboxylic acid (H2TBC, TBC = 4-tetrazolyl benzenecarboxylate) and zinc. H2TBC was also synthesized with the solvothermal approach, and is referred herein as structure 1. Using single-crystal X-ray diffraction, we found that the tetrazolate groups of TBC show an unusual “opposite-on” coordination mode with zinc. Three previously characterized metal-organic frameworks (MOFs) were obtained by systematically changing the solvents of the H2TBC-Zn reaction, (1) ZnTBC, 2, which has a non-porous structure; (2) Zn2(TBC)2(H2O), 3, which has an amphiphilic pore structure and (3) Zn2(TBC)2{guest}, 4, which is porous and has channels containing uncoordinated N heteroatoms. Fluorescence spectra of 4 reveal a strong blue emission mainly from the TBC ligands. Full article
(This article belongs to the Special Issue Metal-Organic Frameworks (MOFs): Energy and Informatics)
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Open AccessArticle Ferronematics Based on Paramagnetic Nitroxide Radical Liquid Crystal
Crystals 2015, 5(2), 206-214; doi:10.3390/cryst5020206
Received: 23 March 2015 / Revised: 16 April 2015 / Accepted: 20 April 2015 / Published: 27 April 2015
Cited by 3 | PDF Full-text (715 KB) | HTML Full-text | XML Full-text
Abstract
We have prepared novel ferronematics based on a paramagnetic liquid crystalline (LC) material. Our ferronematics can disperse a higher volume fraction of magnetic nanoparticles compared to classical ferronematics because paramagnetic nature of the host LC material prevents the aggregation of magnetic nanoparticles. The
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We have prepared novel ferronematics based on a paramagnetic liquid crystalline (LC) material. Our ferronematics can disperse a higher volume fraction of magnetic nanoparticles compared to classical ferronematics because paramagnetic nature of the host LC material prevents the aggregation of magnetic nanoparticles. The interactions between the magnetic nanoparticles and the LC material enhance a magnetic anisotropy of ferronematics and improve the magnetic responsivity. Full article
(This article belongs to the Special Issue Liquid Crystal Films)
Open AccessCommunication Synthesis, Crystal Structure, and Electroconducting Properties of a 1D Mixed-Valence Cu(I)–Cu(II) Coordination Polymer with a Dicyclohexyl Dithiocarbamate Ligand
Crystals 2015, 5(2), 215-225; doi:10.3390/cryst5020215
Received: 6 February 2015 / Revised: 7 April 2015 / Accepted: 20 April 2015 / Published: 29 April 2015
Cited by 1 | PDF Full-text (10990 KB) | HTML Full-text | XML Full-text
Abstract
A new mixed-valence Cu(I)–Cu(II) 1D coordination polymer, [CuI4CuIIBr4(Cy2dtc)2]n, with an infinite chain structure is synthesized by the reaction of Cu(Cy2dtc)2 (Cy2dtc = dicyclohexyl dithiocarbamate,
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A new mixed-valence Cu(I)–Cu(II) 1D coordination polymer, [CuI4CuIIBr4(Cy2dtc)2]n, with an infinite chain structure is synthesized by the reaction of Cu(Cy2dtc)2 (Cy2dtc = dicyclohexyl dithiocarbamate, C13H22NS2) with CuBr·S(CH3)2. The as-synthesized polymer consists of mononuclear copper(II) units of CuII(Cy2dtc)2 and tetranuclear copper(I) cluster units, CuI4Br4. In the cluster unit, all the CuI ions have distorted trigonal pyramidal coordination geometries, and the CuI–CuI or CuI–CuII distances between the nearest copper ions are shorter than the sum of van der Waals radii for Cu–Cu. Full article
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Open AccessArticle Novel S = 1/2 Kagome Lattice Materials: Cs2TiCu3F12 and Rb2TiCu3F12
Crystals 2015, 5(2), 226-243; doi:10.3390/cryst5020226
Received: 18 March 2015 / Revised: 16 April 2015 / Accepted: 21 April 2015 / Published: 5 May 2015
Cited by 1 | PDF Full-text (883 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Two new members of the A2B′Cu3F12 family of kagome-related materials have been prepared, in order to further understand the crystal-chemical relationships, phase transitions and magnetic behaviour within this family of potentially frustrated S = ½ two-dimensional quantum magnets.
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Two new members of the A2B′Cu3F12 family of kagome-related materials have been prepared, in order to further understand the crystal-chemical relationships, phase transitions and magnetic behaviour within this family of potentially frustrated S = ½ two-dimensional quantum magnets. Cs2TiCu3F12 adopts a crystal structure with the ideal kagome lattice topology (space group R m) at ambient temperature. Diffraction studies reveal different symmetry-lowering structural phase transitions in single crystal and polycrystalline forms at sub-ambient temperatures, with the single crystal form retaining rhombohedral symmetry and the powder form being monoclinic. In both cases, long-range antiferromagnetic order occurs in the region 16–20 K. Rb2TiCu3F12 adopts a distorted triclinic structure even at ambient temperatures. Full article
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Open AccessArticle Cleavage of the Pt-I bond in a Primary Cycloplatinated Amine by Chelation
Crystals 2015, 5(2), 244-251; doi:10.3390/cryst5020244
Received: 23 April 2015 / Accepted: 18 May 2015 / Published: 22 May 2015
Cited by 2 | PDF Full-text (1239 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In the square-planar cycloplatinated complex of R–phenylethylamine, both additional substituents, an anionic iodo and a neutral donor ligand, have been replaced by chelating ethylenediamine. A very pronounced trans influence is observed in the cationic product complex: Two significantly different bond distances to
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In the square-planar cycloplatinated complex of R–phenylethylamine, both additional substituents, an anionic iodo and a neutral donor ligand, have been replaced by chelating ethylenediamine. A very pronounced trans influence is observed in the cationic product complex: Two significantly different bond distances to the chelating ligand are found, the longer in trans geometry to the coordinated carbon atom. The positive charge of the monocationic complex is balanced by an uncoordinated iodide. This target solid crystallizes with four independent cations and anions in the unit cell; pairs of complex cations related by pseudo-inversion are stabilized by T stacking. Classical N–H···I hydrogen bonds lead to a layer structure in the (0 1 0) plane. Full article
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Open AccessArticle Flux Growth and Crystal Structure Refinement of Calcite Type Borate GaBO3
Crystals 2015, 5(2), 252-260; doi:10.3390/cryst5020252
Received: 1 May 2015 / Revised: 20 May 2015 / Accepted: 21 May 2015 / Published: 27 May 2015
Cited by 5 | PDF Full-text (1011 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A single crystal of gallium borate, GaBO3, 4 × 4 × 0.2 mm3 in size has been grown by spontaneous crystallization with a molten flux based on a Bi2O3-3B2O3 solvent. From single crystal
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A single crystal of gallium borate, GaBO3, 4 × 4 × 0.2 mm3 in size has been grown by spontaneous crystallization with a molten flux based on a Bi2O3-3B2O3 solvent. From single crystal X-ray diffraction measurement, GaBO3 was found to crystallize in the trigonal calcite type, space group R-3c, with cell dimensions a = 4.56590(10) and c = 14.1764(4) Å, Z = 6. Layers of distorted [GaO6] octahedra are interleaved by layers of triangular planar [BO3] unites. The transmission spectrum on a single crystal indicated that the band gap of GaBO3 is 3.62 eV. Full article
Open AccessArticle Incidental Polymorphism, Non-Isomorphic and Isomorphic Substitution in Calcium-Valine Coordination Polymers
Crystals 2015, 5(2), 261-272; doi:10.3390/cryst5020261
Received: 23 April 2015 / Revised: 20 May 2015 / Accepted: 22 May 2015 / Published: 29 May 2015
Cited by 1 | PDF Full-text (9324 KB) | HTML Full-text | XML Full-text
Abstract
Five coordination polymers with the stoichiometry CaX2(valine)2(H2O)2 (X = Cl, Br) were obtained from the corresponding calcium halides and either racemic and enantiopure valine. In all cases the zwitterionic amino acid is exclusively O coordinated and the halides act as counteranions for the
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Five coordination polymers with the stoichiometry CaX2(valine)2(H2O)2 (X = Cl, Br) were obtained from the corresponding calcium halides and either racemic and enantiopure valine. In all cases the zwitterionic amino acid is exclusively O coordinated and the halides act as counteranions for the resulting one-dimensional cationic chains. The enantiopure chloride shows dimorphism; both forms differ in connectivity from the bromide. In contrast to this structural variability for L-valine, the derivatives of the racemic amino acid are isomorphous. Full article
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Review

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Open AccessReview The Growth and Properties of Lead-Free Ferroelectric Single Crystals
Crystals 2015, 5(2), 172-192; doi:10.3390/cryst5020172
Received: 30 April 2014 / Accepted: 15 September 2014 / Published: 25 March 2015
Cited by 4 | PDF Full-text (49554 KB) | HTML Full-text | XML Full-text
Abstract
Much attention is drawn to the preparation, structure and properties investigation of lead-free ferroelectrics for the next generation of piezoelectric devices. (Na0.5Bi0.5)TiO3-BaTiO3 (NBT-BT) lead-free solid solution piezoelectric single crystals with composition x in the range of
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Much attention is drawn to the preparation, structure and properties investigation of lead-free ferroelectrics for the next generation of piezoelectric devices. (Na0.5Bi0.5)TiO3-BaTiO3 (NBT-BT) lead-free solid solution piezoelectric single crystals with composition x in the range of 0–0.05 as a materials with high piezoelectric properties were successfully grown from platinum crucible by using the top-seeded solution growth (TSSG) method. The dimensions of NBT-BT crystal is Ø40 × 10 mm2. X-ray powder diffraction patterns reveal that the crystal structure of NBT-BT crystal changes from rhombohedral to tetragonal symmetry with increasing amounts of BT(x). The dielectric, ferroelectric and piezoelectric properties of NBT-BT crystals with different compositions near the morphotropic phase boundary (MPB) were studied systematically. Ions (Mn, Eu, Zn) doped NBT and NBT-BT 95/5 crystals were also grown and studied. In addition, their piezoelectric and ferroelectric properties are investigated. Further, a high-quality and large-sized (K0.25Na0.75)NbO3 (KNN25/75) single crystal has been achieved by a carefully controlled TSSG method. The dimensions of the as-grown KNN25/75 single crystal reached up to Ø30 × 10 mm2. The obtained KNN crystals provided us a superb material for the dielectric, piezoelectric, ferroelectric and electromechanical coupling property characterization along different orientations. Full article
(This article belongs to the Special Issue Piezoelectric Crystals)
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