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Crystals, Volume 5, Issue 2 (June 2015) – 9 articles , Pages 172-274

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155 KiB  
Editorial
Crystals Best Paper Award 2015
by Helmut Cölfen
Crystals 2015, 5(2), 273-274; https://doi.org/10.3390/cryst5020273 - 5 Jun 2015
Viewed by 4472
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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9324 KiB  
Article
Incidental Polymorphism, Non-Isomorphic and Isomorphic Substitution in Calcium-Valine Coordination Polymers
by Kevin Lamberts and Ulli Englert
Crystals 2015, 5(2), 261-272; https://doi.org/10.3390/cryst5020261 - 29 May 2015
Cited by 6 | Viewed by 5829
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 [...] Read more.
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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1011 KiB  
Article
Flux Growth and Crystal Structure Refinement of Calcite Type Borate GaBO3
by Shichao Wang, Ning Ye and Kenneth R. Poeppelmeier
Crystals 2015, 5(2), 252-260; https://doi.org/10.3390/cryst5020252 - 27 May 2015
Cited by 14 | Viewed by 6840
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 [...] Read more.
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
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1239 KiB  
Article
Cleavage of the Pt-I bond in a Primary Cycloplatinated Amine by Chelation
by William Raven, Irmgard Kalf and Ulli Englert
Crystals 2015, 5(2), 244-251; https://doi.org/10.3390/cryst5020244 - 22 May 2015
Cited by 3 | Viewed by 3750
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 [...] Read more.
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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883 KiB  
Article
Novel S = 1/2 Kagome Lattice Materials: Cs2TiCu3F12 and Rb2TiCu3F12
by Lewis J. Downie, Elena I. Ardashnikova, Chiu C. Tang, Alexandre N. Vasiliev, Peter S. Berdonosov, Valery A. Dolgikh, Mark A. De Vries and Philip Lightfoot
Crystals 2015, 5(2), 226-243; https://doi.org/10.3390/cryst5020226 - 5 May 2015
Cited by 8 | Viewed by 7453
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. [...] Read more.
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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10990 KiB  
Communication
Synthesis, Crystal Structure, and Electroconducting Properties of a 1D Mixed-Valence Cu(I)–Cu(II) Coordination Polymer with a Dicyclohexyl Dithiocarbamate Ligand
by Kenji Nakatani, Kento Himoto, Yuki Kono, Yuuki Nakahashi, Haruho Anma, Takashi Okubo, Masahiko Maekawa and Takayoshi Kuroda-Sowa
Crystals 2015, 5(2), 215-225; https://doi.org/10.3390/cryst5020215 - 29 Apr 2015
Cited by 9 | Viewed by 6769
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, [...] Read more.
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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715 KiB  
Article
Ferronematics Based on Paramagnetic Nitroxide Radical Liquid Crystal
by Takuya Akita, Yoshiaki Uchida, Sho Nakagami, Daichi Kiyohara and Norikazu Nishiyama
Crystals 2015, 5(2), 206-214; https://doi.org/10.3390/cryst5020206 - 27 Apr 2015
Cited by 4 | Viewed by 6095
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 [...] Read more.
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)
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639 KiB  
Article
Synthesis of Framework Isomer MOFs Containing Zinc and 4-Tetrazolyl Benzenecarboxylic Acid via a Structure Directing Solvothermal Approach
by Carlos Ordonez, Tiffany L. Kinnibrugh, Hongwu Xu, Jennifer Lindline, Tatiana Timofeeva and Qiang Wei
Crystals 2015, 5(2), 193-205; https://doi.org/10.3390/cryst5020193 - 2 Apr 2015
Cited by 6 | Viewed by 6954
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 [...] Read more.
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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49554 KiB  
Review
The Growth and Properties of Lead-Free Ferroelectric Single Crystals
by Xiaobing Li, Chao Chen, Hao Deng, Haiwu Zhang, Di Lin, Xiangyong Zhao and Haosu Luo
Crystals 2015, 5(2), 172-192; https://doi.org/10.3390/cryst5020172 - 25 Mar 2015
Cited by 17 | Viewed by 10172
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 [...] Read more.
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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