Synthesis, magnetism, electron paramagnetic resonance studies, x-ray molecular structure, and spectral properties of .mu.4-oxo-hexa-.mu.-chloro-tetrakis[(3-quinuclidinone)copper(II)]

Synthesis and crystal structure of (μ4-oxido)hexakis(μ-chlorido)tetrakis(2-(3-pyridyl)ethane-1-ol)tetracopper(II)

“…The Cu-Cu distances vary from 3.1057(9) to 3.127(1) Å. These distances are comparable with the literature [1,2,.…”

“…The Cu-Cu distances vary from 3.1057(9) to 3.127(1) Å. These distances are comparable with the literature [1,2,.A special point of interest concerns the hydrogen bond system of the hydrogen atoms of the oxygen atoms of the ligand, which form a 3D polymeric network (see Fig. 2).…”

“…Polynuclear compounds (and specially compounds with higher nuclearity) of copper(II), with small anions as bridging groups have attracted much attention in the last decades, from both an experimental and theoretical point of view, and a significant amount of research has been done for analyzing their structural and magnetic properties [1][2][3][4][5][6]. One of these types is the tetranuclear compound with the general formula [Cu 4 OCl 6 L 4 ].…”

“…When we focus on the type where L 4 are all 4 equal nitrogen-donor ligands, about 40 X-ray structures are available in the Cambridge Structural Database (CSD) [1,2,. We now have extended the search for new compounds with the ligand 2-(3-pyridyl)ethane-1-ol (abbreviated as 3HOep, see Scheme 1), which has the possibility for interesting intermolecular hydrogen bonds and perhaps also bridging between metals.…”

Preparation and characterization of azaindolyl-azaindole and structure of its halogen-free dicationic cluster containing the µ4-oxotetracopper(II) core

“…5~~0 ? a new strong band is found at 557 cm-' for Cu-0 stretching in the C u 4 0 core (9,27,30,31). Four components at 330, 310, 300, and 290 cm-' are assigned to Cu-N stretching, a strong band at -290 cm-I being present for [cuL~]~' complexes with pyridines (32) and imidazoles (32)(33)(34)(35)(36)(37).…”