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Nickel complex trigonal planar

The reaction of [Ni(ethene)3] with a hydride donor such as trialkyl(hydrido)-aluminate results in the formation of the dinuclear anionic complex [ Ni(eth-ene)2[2l 11 [22]. The nickel(O) centers in this complex are in a trigonal planar environment of two ethene molecules and a bridging hydride ion, with the ethene carbons in the plane of coordination. The two planes of coordination within the dinuclear complex are almost perpendicular to each other, and the Ni-H-Ni unit is significantly bent, with an angle of 125° and a Ni-Ni distance of 2.6 A [22],... [Pg.99]

Earlier we reported the reaction of 1 with Ni(CO)4, in which two carbon monoxide molecules are displaced to yield the tetrahedral complex, (l)2Ni(CO)2 [7]. When bis(cyclooctadiene)nickel is treated with 1 or 2, both cyclooctadiene molecules are lost and the trigonal planar complexes (l) Ni and (2)3Ni are obtained [8]. The stracture of (l)3Ni is shown in Fig. 4. This trigonal structural arrangement for nickel complexes is unusual, but not unprecedented. [Pg.21]

Complexes of Olefins, Acetylenes, and Related Molecules. A number of compounds have been described which contain nickel atoms in trigonal-planar co-ordination, one or more of the co-ordination sites being occupied by the multiple bond of a mono-olefin or similar species. A review of such compounds, containing structural data, has appeared. ... [Pg.601]

In (362), the cation is distorted trigonal pyramidal with the axial positions occupied by one S atom and the central P atom of the P3 ligand. In the anion the nickel center is bonded to six S-donors of three xanthate ligands. Upon reaction with dppe an approximately square planar NiS2P2 complex results.938 A similar coordination geometry is found for the two complexes (361a,b) 939,940... [Pg.333]

Both nickel(III) and nickel(IV) complexes are usually found in octahedral environments. Less common geometries are the square planar and the trigonal bipyramidal ones. [Pg.288]

The cyclododecatrienylnickel complex [Li(tmeda)]2Ni(cdt) (65) (92) is structurally analogous to 64 each lithium atom is apparently tetrahedrally surrounded by two olefinic carbon atoms and two nitrogen atoms with a possible additional interaction with the nickel atom. The nickel atom in 65 adopts a distorted trigonal-bipyramidal geometry with the lithiums occupying the apices, whereas 64 involves a square-planar nickel atom. [Pg.401]

This is particularly true now with the recent discovery of trigonal prismatic structures for some 6-coordinated metal complexes (21). Surely the proper metal-ligand combination should give a system in which the difference in energy between an octahedral and a trigonal prismatic structure is small. As a result, racemization may take place by a trigonal twist mechanism. Twisting processes of the square-planar-tetrahedral type are known to occur readily in certain nickel(II) complexes (20). [Pg.426]


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See also in sourсe #XX -- [ Pg.131 ]




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Nickel planar complexes

Nickel trigonal complexes

Trigonal complexes

Trigonal planar

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