Cooperative Jahn−Teller Interactions in Dynamic Copper(II) Complexes. Temperature Dependence of the Crystal Structure and EPR Spectrum of Deuterated Ammonium Copper(II) Sulfate Hexahydrate

1999 ◽  
Vol 121 (7) ◽  
pp. 1488-1501 ◽  
Author(s):  
Michael A. Hitchman ◽  
Wim Maaskant ◽  
Jaco van der Plas ◽  
Charles J. Simmons ◽  
Horst Stratemeier
Keyword(s):  
Crystal Structure ◽  
Temperature Dependence ◽  
Epr Spectrum ◽  
Jahn Teller

Temperature Dependence of the Crystal Structure and EPR Spectrum of Bis(1,3,5-Trihydroxycyclohexane)copper(II) Tosylate. A Unified Interpretation Using a Model of Dynamic Vibronic Coupling

1996 ◽  
Vol 35 (25) ◽  
pp. 7419-7429 ◽  
Author(s):  
Joachim Bebendorf ◽  
Hans-Beat Bürgi ◽  
Eduard Gamp ◽  
Michael A. Hitchman ◽  
Angela Murphy ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Temperature Dependence ◽  
Vibronic Coupling ◽  
Epr Spectrum

Temperature Dependence of the EPR Spectrum of Copper(II)- carnosine

1976 ◽  
Vol 6 (2) ◽  
pp. 119-121 ◽  
Author(s):  
Ronald E. Viola ◽  
Charles R. Hartzell ◽  
Joseph J. Villafranca
Keyword(s):  
Temperature Dependence ◽  
Epr Spectrum

Temperature dependence of the EPR spectrum of Co2 ion in crystals Zn(BF4)2 × 6H2O

2003 ◽  
Vol 236 (3) ◽  
pp. 640-644 ◽  
Author(s):  
G. N. Neilo ◽  
A. A. Prokhorov ◽  
S. N. Lykin ◽  
A. S. Karnachev ◽  
A. D. Prokhorov
Keyword(s):  
Temperature Dependence ◽  
Epr Spectrum

scholarly journals The crystal structure of szenicsite, Cu3MoO4(OH)4

1998 ◽  
Vol 62 (04) ◽  
pp. 461-469 ◽  
Author(s):  
Peter C. Burns
Keyword(s):  
Crystal Structure ◽  
Goodness Of Fit ◽  
Direct Methods ◽  
Ligand Field ◽  
Area Detector ◽  
Vertex Sharing ◽  
Distorted Octahedral ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Least Squares Techniques

Abstract The crystal structure of szenicsite, Cu3MoO4(OH)4, orthorhombic, a = 8.5201(8), b = 12.545(1), c = 6.0794(6) Å, V = 649.8(2) Å3, space group Pnnm, Z = 4, has been solved by direct methods and refined by least-squares techniques to an agreement index (R) of 3.34% and a goodness-of-fit (S) of 1.11 for 686 unique observed [|F| ⩾ 4σF] reflections collected using graphite-monochromated Mo-Kα X-radiation and a CCD area detector. The structure contains three unique Cu2+ positions that are each coordinated by six anions in distorted octahedral arrangements; the distortions of the octahedra are due to the Jahn-Teller effect associated with a d 9 metal in an octahedral ligand-field. The single unique Mo6+ position is tetrahedrally coordinated by four O2− anions. The Cu2+ϕ6 (ϕ: unspecified ligand) octahedra share trans edges to form rutile-like chains, three of which join by the sharing of octahedral edges to form triple chains that are parallel to [001]. The MoO4 tetrahedra are linked to either side of the triple chain of Cu2+ϕ6 octahedra by the sharing of two vertices per tetrahedron, and the resulting chains are cross-linked through tetrahedral-octahedral vertex sharing to form a framework structure. The structure of szenicsite is closely related to that of antlerite, Cu3SO4(OH)4, which contains similar triple chains of edge-sharing Cu2+ϕ6 octahedra.

NQR and Crystal Structure of 4,5-Dichloroimidazole, C3H2N2Cl2

1992 ◽  
Vol 47 (1-2) ◽  
pp. 177-181 ◽  
Author(s):  
Shi-Qi Dou ◽  
Alarich Weiss
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Unit Cell ◽  
Space Group ◽  
Temperature Range ◽  
Temperature Coefficients ◽  
Group D

AbstractThe two line 35Cl NQR spectrum of 4,5-dichloroimidazole was measured in the temperature range 77≦ T/K ≦ 389. The temperature dependence of the NQR frequencies conforms with the Bayer model and no phase transition is indicated in the curves v ( 35Cl)= f(T). Also the temperature coefficients of the 35Cl NQR frequencies are "normal". At 77 K the 35Cl NQR frequencies are 37.409 MHz and 36.172 MHz and at 389 K 35.758 MHz and 34.565 MHz. The compound crystallizes at room temperature with the tetragonal space group D44-P41212, Z = 8 molecules per unit cell; at 295 K : a = 684.2(5) pm, c = 2414.0(20) pm. The relations between the crystal structure and the NQR spectrum are discussed.

NQR, NMR, and X-ray crystal structure studies of [4-C2H5-C6H4NH3]2MBr4 (M=Zn, Cd)

2018 ◽  
Vol 73 (9) ◽  
pp. 611-616
Author(s):  
Hideta Ishihara ◽  
Hisashi Honda ◽  
Ingrid Svoboda ◽  
Hartmut Fuess
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Temperature Dependence ◽  
Benzene Ring ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Unit Cell ◽  
Organic Layers ◽  
Nuclear Magnetic Resonance Spectra ◽  
Quadrupole Resonance

AbstractThe crystal structure of [4-C2H5-C6H4NH3]2ZnBr4 (1) has been determined at 150(2) K: triclinic, P1̅, a=724.82(2), b=1194.20(4), c=1322.26(4) pm, α=74.151(3), β=80.887(3), γ=80.434(3)°, and Z=2. There are two crystallographically independent cations in the unit cell of 1: one has its benzene ring perpendicular to the crystallographic a axis of the unit cell and the other one has its benzene ring perpendicular to the c axis. These cations are alternatingly located along the c axis and form organic layers, and the ZnBr4 anions form inorganic layers in between. Zn–Br···H–N hydrogen bonds are formed between cations and anions. In accordance with the crystal structure, four nuclear quadrupole resonance (NQR) lines of 81Br were observed. The temperature dependence of the 81Br NQR frequencies between 77 and 320 K shows a peculiar feature which is not due to a structural phase transition. The measurement of 13C nuclear magnetic resonance spectra at around T=340 K indicates a redistribution of cations. The temperature dependence of 81Br NQR frequencies and differential thermal analysis measurements show that [4-C2H5-C6H4NH3]2CdBr4 (2) undergoes a structural phase transition at around 190 K.

Crystal structure and temperature dependence of permittivity in barium aluminate based solid solutions

2019 ◽  
Vol 102 (12) ◽  
pp. 7480-7490 ◽  
Author(s):  
Jie Li ◽  
Xue‐Kai Lan ◽  
Kang Du ◽  
Xiao‐Qiang Song ◽  
Wen‐Zhong Lu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Temperature Dependence ◽  
Solid Solutions ◽  
Barium Aluminate

Anisotropic EPR spectrum of the Jahn-Teller system Cu2+in zinc bromate hexahydrate

1976 ◽  
Vol 9 (8) ◽  
pp. L219-L222 ◽  
Author(s):  
A Jesion ◽  
Y H Shing ◽  
D Walsh ◽  
J D H Donnay
Keyword(s):  
Epr Spectrum ◽  
Jahn Teller
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