Nickel tetrahedra complexes

K. Tamao, S. Kodama, I. Nakajima, M. Kumada, A. Minato, and K. Suzuki, Nickel-phosphine complex-catalyzed Grignard coupling — II Grignard coupling of heterocyclic compounds, Tetrahedron, 38 3347-3354, 1982. 

Miyashita, A. and Gmbbs, R.H. (1981) Reactions of nickel-carbene complexes generated from nickelacycle complexes. Tetrahedron Letters, 22, 1255—1256. 

Tamao, K., Kodama, S., Nakajima, I., Kumada, M., Minato, A. and Suzuki, S. (1982) "Nickel-phosphine complex catalyzed Grignard coupling-II - Grignard coupling of heterocyclic compounds" Tetrahedron 38,3347-3354. 

A minor change in the nature of the ligands sometimes produces a great change in the nature of a complex. Thus, if R" is —(CH2)2— in the branched quadridentate ligand (6), the nickel complex is a dimer in which each half is planar and diamagnetic, but if R" is —(CH2)3— the complex is polymeric and paramagnetic each nickel atom is at the center of a tetrahedron.23... 

The metal(O) isocyanide clusters Ni4(CNBu )7 (45)5 (60), Pt3(CNBu )6 (46) (23) and Pt7(CNXylyl),2 (47) (20) have been characterized crystallographi-cally. In the nickel complex the nickel atoms define the vertices of a highly compressed C3v tetrahedron, with each nickel having a terminal isocyanide and three basal nickel atoms joined by three four-electron donor isocyanide ligands. The unusual feature of the structure of Pt7(CNXylyl),2 is that one... 

In the molecular complex of 1,3,5-trinitrobenzene with bis-(t-butyl-salicylideneiminato)nickel(ii) the co-ordination around the metal atom is a slightly flattened tetrahedron (21). The angle between the two NiNO planes. 

Derien S, Clinet J-C, Dunach E, Perichon J (1992) Electrochemical incorporation of carbrni dioxide into alkenes by nickel complexes. Tetrahedron 48 5235-5248... 

Yadav JS, Abraham S, Reddy BVS, Sabitha G (2001) Addition of pyrroles to electron deficient olefins employing InCL. Tetrahedron Lett42 8063-8065. doi 10.1016/S0040-4039(01)01697-5 Yamamoto T, Morita A, Miyazaki Y, Mamyama T, Wakayama H, Zhou ZH, Nakamura Y, Kanbara T, Sasaki S, Kubota K (1992) Preparation of Jt-conjugated poly(thiophene-2,5-diyl), poly(p-phenylene), and related polymers using zerovalent nickel complexes. Linear structure and properties of the ii-conjugated polymers. Macromolecules 25 1214-1223. doi 10.1021/ ma00030a003... 

The cyclopropenyl cation CsHs , shoxild, on the basis of Huckel s rule, also be an aromatic system with 2 w-electrons the complex [(ir-PhaCa)-NiCl(py)2].py, 8.1, has been shown, by X-ray diffraction, to contain the triphenyl-cyclopropenyl ligand. The geometry around the central nickel atom is a distorted tetrahedron. 

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