{4,4′,6,6′-Tetra­chloro-2,2′-[(spiro­[4.4]nonane-1,6-di­yl)bis­(nitrilo­methyl­idyne)]diphenolato-κ4 O,N,N′,O′}nickel(II)

The title compound, [Ni(C23H20Cl4N2O2)], has an NiII ion in a square-planar coordination formed by two imine N and two phenolato O atoms

Coppper(I) ethylenediamine carbonyl complexes: ‘models’ for carbon monoxide activation. X-Ray structure of the ion-pair carbonylethylenediaminetetraphenylboratocopper

Copper (I) iodide absorbs carbon monoxide in methanol in the presence of ethylenediamine (en), giving solutions from which [Cu2(en)3(CO)2]I2, [Cu2(en)3(CO)2](BPh4)2, and [Cu(en)2CO]I have been obtained as thermally stable compounds; the reaction of CuCOCl with en allowed the isolation of [Cu(en)(CO)PhBPh3], an X-ray structure determination of which shows the presence of a three-co-ordinate copper(I) interacting with the BPh4– anion

Copper(I)–histamine system: a reversible carbon monoxide carrier. Isolation and X-ray crystal structure of two Cu–histamine–CO complexes

Reaction of a methanolic suspension of CuCOCl with histamine (hm) at 0°C gives a solution from which [Cu(hm)CO]BPh4[νCO(Nujol) 2091 cm–1] is recovered, while a methanolic suspension of CuI in the presence of histamine reversibly absorbs carbon monoxide [1 CO per Cu] giving [Cu2(hm)3(CO)2]2+; X-ray analysis of [Cu2-(hm)3(CO)2](BPh4)2[νCO(Nujol) 2055 and 2066 cm–1] shows the presence of a dimeric cation with one histamine chelated to each copper, and the other one bridging the two metal atoms

The role of halide ligands in copper(I) carbonyl chemistry: synthesis of monohalogen-bridged dinuclear copper(I) carbonyls, and X-ray crystal structure of [Cu2(Me2NCH2CH2NMe2)2(CO)2Cl](BPh4)

Reaction of copper(I) halides, CuX (X = Cl, Br, or I), with carbon monoxide in MeOH in the presence of NNN′N′-tetramethylenediamine (tmen) produces dinuclear copper(I) carbonyls, [Cu2(tmen)2(CO)2X]+, νCOca. 2070 cm–1; the structure of the chloro-derivative, [Cu2(tmen)2(CO)2Cl](BPh4), has been determined by X-ray crystallography which shows that the two copper atoms in the molecule are bridged by a single halogen atom and the molecule contains a bent Cu–Cl–Cu unit with an angle of 103·0(1)°

Bridging phenoxo-ligands in dicopper(I) complexes: synthesis and structure of tetrakis(isocyanide)-bis(µ-phenoxo)-dicopper(I) complexes

The reaction of CuCl with PhONa followed by the addition of RNC (R = cyclohexyl, p-tolyl) gave as thermally stable crystalline solids [(RNC)4Cu2(OPh)2] containing a dicopper(I) unit doubly bridged by two phenoxo-groups [R =p-tolyl; Cu … Cu, 3.223(3)Å], with isocyanide ligands completing the tetraco-ordination around each copper [ν(C–N): R =p-tolyl, 2120 and 2145 cm–1; R = cyclohexyl, 2130 and 2160 cm–1]