Switching from positive to negative axial thermal expansion in two organic crystalline compounds with similar packing

2018 ◽  
Vol 54 (76) ◽  
pp. 10675-10678 ◽  
Author(s):  
Lalita Negi ◽  
Ashutosh Shrivastava ◽  
Dinabandhu Das
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Crystal Packing ◽  
Unusual Phenomenon ◽  
Packing Arrangement ◽  
Thermal Vibrations

Switching from positive to negative axial thermal expansion was observed in two organic crystalline compounds with similar crystal packing. This unusual phenomenon has been explained by the packing arrangement of molecules in the crystal structure and transverse thermal vibrations of atoms.

scholarly journals Crystal structure of catena-poly[[(μ-6-{[bis(pyridin-2-ylmethyl)amino]methyl}pyridine-2-carboxylato)copper(II)] perchlorate acetonitrile monosolvate]

2019 ◽  
Vol 75 (6) ◽  
pp. 789-793
Author(s):  
Giacomo Cioncoloni ◽  
Claire Wilson ◽  
Isolda Roger ◽  
Mark D. Symes
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Crystal Packing ◽  
Complex Molecule ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Space Group ◽  
Two Component ◽  
Packing Arrangement ◽  
Amine Ligand

The crystal structure of the title compound, {[Cu(C19H17N4O2)]ClO4·C2H3N} n , is reported and compared to similar structures in the literature. The compound crystallizes in the monoclinic space group P21. The unit cell contains one complex molecule in addition to perchlorate as the counter-ion and solvent (acetonitrile). The crystal packing evinces extended chains whereby the carboxylate moiety on the 6-carboxylato-2-(pyridylmethyl)bis(pyridin-2-ylmethyl)amine ligand bridges between two different copper centers in adjacent molecules. This packing arrangement for the title compound appears to be unique when compared to allied structures in the literature. The perchlorate anion showed signs of disorder and its oxygen atoms were modelled over two sets of partially occupied sites, the occupancy of which was competitively refined to 0.564 (12)/0.436 (12). The crystal studied was refined as a two-component inversion twin.

Channel-Type Crystal Packing in the Very Rare Space Group P4212 with Z' = 3/4: Crystal Structure of the Complex γ-Cyclodextrin–Methanol–n-Hydrate

1998 ◽  
Vol 54 (4) ◽  
pp. 450-455 ◽  
Author(s):  
T. Steiner ◽  
W. Saenger
Keyword(s):  
Crystal Structure ◽  
Crystal Packing ◽  
Cell Content ◽  
Guest Molecules ◽  
Space Group ◽  
Cyclodextrin Inclusion Complexes ◽  
Packing Arrangement ◽  
Type Crystal ◽  
Channel Type

The crystal structure of the title compound is discussed with focus on its unusual crystal packing mode. The γ-cyclodextrin molecules stack in columns which have internal channels and additional large channels are formed between the columns. Both types of channels are so wide that more or less free diffusion of water and small guest molecules is possible, preventing characterization of the solvent and guest arrangements. Although the space group P4212 (no. 90) and the unit-cell content Z′ = 3\over 4 are extremely rare in general, this is the favorite crystal packing arrangement of γ-cyclodextrin inclusion complexes. This space group has not been observed as yet for other purely organic compounds.

Crystal structure, thermal expansion and fluorescence of Sr3–1.5Eu B2+Si1–O8–/2 phosphors

2021 ◽  
Vol 260 ◽  
pp. 124151
Author(s):  
Maria G. Krzhizhanovskaya ◽  
Sergey N. Volkov ◽  
Alexey V. Povolotskiy ◽  
Rimma S. Bubnova ◽  
Olga L. Belousova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion

ChemInform Abstract: Magnetization, Crystal Structure and Anisotropic Thermal Expansion of Single-Crystal SrEr2O4.

ChemInform ◽  
2015 ◽  
Vol 46 (10) ◽  
pp. no-no
Author(s):  
Hai-Feng Li ◽  
Andrew Wildes ◽  
Binyang Hou ◽  
Cong Zhang ◽  
Berthold Schmitz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Single Crystal ◽  
Anisotropic Thermal Expansion

Study on a Novel Structure of Zn Phenanthroline Malic Acid Hydrate, [Zn (C12H8N2)(C4H4O5)(H2O)](H2O)

2013 ◽  
Vol 739 ◽  
pp. 26-29
Author(s):  
Hai Xing Liu ◽  
Jing Zhong Xiao ◽  
Huan Mei Guo ◽  
Qing Hua Zhang ◽  
Zhang Xue Yu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Malic Acid ◽  
Hydrothermal Reaction ◽  
Crystal Packing ◽  
X Ray Diffraction ◽  
Acid Anion ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Novel Structure ◽  
Acid Hydrate

A novel Zn complex [Zn (C12H8N2)(C4H4O5)(H2O)](H2O) has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Zn atom is six-coordinated by two phenanthroline N atoms, three O atoms from malic acid anion and one O atom from water. The crystal packing is stabilized by O-H...O hydrogen bonding interactions.

4-(Bromomethyl)benzophenone

2007 ◽  
Vol 63 (3) ◽  
pp. o1188-o1189 ◽  
Author(s):  
Wei-Jian Xu ◽  
Yang-Ling Zang ◽  
Guo-Liang Wu ◽  
Sheng-Pei Su ◽  
De-Yue Qiu
Keyword(s):  
Crystal Structure ◽  
Carbon Tetrachloride ◽  
Dihedral Angle ◽  
Structure Analysis ◽  
Title Compound ◽  
Crystal Packing ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
Compound C ◽  
Phenyl Rings

The title compound, C14H11BrO, was synthesized by the reaction of 4-methylbenzophenone and bromine in carbon tetrachloride. X-ray crystal structure analysis reveals that the benzene and phenyl rings form a dihedral angle of 59.53 (6)°, and the crystal packing is stabilized by intermolecular C—H...π interactions.

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