Magnetic properties of di-.mu.-chlorobis[dichloro(guaninium)copper(II)] dihydrate. Second determination

Abstract

Notes value over quite a wide range, and the positions of these levels were therefore calculated using an approximate value of B « 500 cm-1 (based on the solution data) and the other param-

Interaction of hydrazine with copper(II) chloride in acidic solutions. Formation, spectral and magnetic properties, and structures of copper(II), copper(I), and mixed-valence species

“…Thus, the bridging geometry here is different from that in the analogous bromide-bridged chains referred to earlier35 in that the bridging angle here is obtuse while in those earlier structures it was acute. Indeed, in the present case the out-of-plane interaction is stronger than those of 3.109 (2) and comparable with values of 3.866 (2) and 3.737 (6) Á in these complexes.…”

“…Magnetic susceptibilities as a function of temperature and applied field were measured by a vibrating-sample magnetometer, and the data were corrected for diamagnetism of the constituent ions and for temperature-independent paramagnetism (TIP), estimated to be 60 X 10"6 cgsu for Cu(II), as described previously. 6 Electronic spectra in the visible and near-infrared regions were obtained with a Cary 14 spectrophotometer. Samples were prepared as Nujol mulls on filter paper.…”

Ferromagnetic Exchange in Bichloride Bridged Cu(II) Chains: Magnetostructural Correlations between Ordered and Disordered Systems

“…The Cu–Cl bond in Cu 2 Cl 8 4– that is opposite the large basal plane angle is elongated. This distortion is also found in other five-coordinate copper dimers, such as bis­(3-aminopyridinium)­hexachloro-dicuprate (II) and di-μ-chlorobis­[dichloro­(guaninium)­copper­(II)]­dihydrate . While the large Cl–Cu–Cl angle is typical of the folded 4 + 1 geometry found in many copper­(II) halide salts, the elongated bond is significantly shorter than normal for such species (∼2.5 Å vs 2.7 Å).…”

Structural characterization, ROS-inductive and proteasome inhibitory properties of ternary and binary copper(II) complexes of N2- and N2O2-ligands

“…Such unequal copper-chlorido distances are common in chlorido-bridged copper dimers [40][41][42][43][44]. The CuÁ Á ÁCu 0 distance is 3.4258(6) Å (3.5887(5) Å for other dimer) and this long distance is unlikely to allow direct spin-spin coupling to occur as it is much greater than the interatomic distance of 2.556 Å in metallic copper at 20°C [45].…”