The Influence of Vibronic Coupling on the Spectroscopic Properties and Stereochemistry of Simple 4- and 6-Coordinate Copper(II) Complexes

An expanded cavity hexaamine cage for copper(ii)

“…1 H and proton-decoupled 13 2 O was determined at 296 K using a vibrating magnetometer. Cyclic voltammetry was performed with a Bioanalytical Systems BAS100 electrochemical analyser employing a glassy carbon working electrode, Ag/AgCl reference and Pt counter electrode.…”

“…18, 19 In the present systems, the most relevant ligand-derived distortion is due to the trigonal twist imposed on the six-coordinate geometry by the constraints of the cage. Trigonal twist distortions away from an ideal trigonal antiprism (φ = 60 • ) are most significant in the smaller cages [Cu{(NH 3 ) 2 8 and Cr(III). 7 The 60 K solid state EPR spectrum of [Cu(fac-Me 5 -tricosane-N 6 )](ClO 4 )·2H 2 O diluted (1%) into the lattice of its EPR silent, isomorphous Zn(II) analogue 8 (Fig.…”

Structural Correlation in Jahn–Teller Systems of Cu2+and Mn3+under Pressure

“…The A 2 CuCl 4 (A=Rb,C n H 2n+1 NH 3 ; n=1-3) [1][2][3][4][5][6][7][8][9] and AMnF 4 (A: Rb, Na, Tl, Cs) [10][11][12][13][14][15][16]) layered compounds present a large variety of interesting physical phenomena associated with antiferrodistortive (AFD) structure displayed by the Jahn-Teller (JT) axially elongated CuCl 6 4-and MnF 6 3-complexes, respectively. They have attracted interest as two-dimensional ferromagnets with T C 10 K 1,3,7,8,10,11) , as related material to high T C superconductors and colossal magnetoresistors 17) , as an organic/inorganic hybrid layered system, and as piezochromic materials 5,13) .…”

“…They have attracted interest as two-dimensional ferromagnets with T C 10 K 1,3,7,8,10,11) , as related material to high T C superconductors and colossal magnetoresistors 17) , as an organic/inorganic hybrid layered system, and as piezochromic materials 5,13) . In the last years an intense activity aimed to investigate the behavior of these materials under hydrostatic pressure, in particular, for exploring pressure-induced structural transitions associated with the disappearance of the AFD structure and tilting phenomena [3][4][5][6][7][8]14 . The former effect is noteworthy since it must lead to a switch in the 2D magnetic behavior from ferromagnetic to antiferromagnetic.…”

Local Structure of Cu2+ in the (C2H5NH3)2MCl4:Cu2+ (M = Cd, Mn) Layer Perovskites. Influence of Hydrostatic Pressure in the 0–60 kbar Range*

“…CuCl4,-complexes, unusual for chlorides [1,2] [4]. In contrast, pure (CnH2n+1NH3)2CuCl4 compounds display an in-plane antiferrodistortive structure of axially elongated CuCl4- [5].…”