Synthesis and relation between magnetic and structural properties of a series of monomeric and dimeric nickel(II) complexes. Crystal and molecular structures of [Ni(biq)Cl2]2, Ni(biq)Br2, [Ni(dmp)Cl2]2, [Ni(dmp)Br2]2 and Ni(bc)I2

Abstract

Die magnetischen und strukturellen Eigenschaften der durch Zusammengehen der Komponenten erhaltenen Titelkomplexe werden untersucht und ihre Beziehungen zueinander diskutiert.

(2,2'-Biquinoline-κ2N,N')chloro(2,2':6',2''-terpyridine-κ3N,N',N'')ruthenium(II) hexafluorophosphate, [RuCl(C18H12N2)(C15H11N3)][PF6]

“…These distorsions from planarity are consistent with an overall banana-shaped curvature of the biq ligand, similar to that observed in biq complexes of other metals (Butcher & Sinn, 1977;Reagen & Radonovich, 1989;Sinn, 1976).…”

Cr/Ni‐Catalyzed Vinylation of Aldehydes: A Mechanistic Study on the Catalytic Roles of Nickel and Chromium

“…This complex 8 ‐NiCl 2 undergoes three fully reversible one‐electron reductions, which are probably both metal‐ and ligand‐centered. Indeed, the molecular structure of the complex [Ni(dmp)Cl 2 ] has been studied: 8 ‐NiCl 2 has been structurally characterized in the form of a dimeric molecule containing two antiferromagnetically coupled five‐coordinated nickel(II) atoms 13c. Unfortunately, our attempts to obtain conclusive information on the metal or ligand contribution for the species resulting from the electrochemical reduction of the 8 ‐NiCl 2 complex by an EPR spectroelectrochemical method were frustrated, even at low temperature.…”

Spectroscopic and electrochemical study of dinuclear and mononuclear copper complexes with the bidentate ligand of the 2,2′-diquinoline series

“…The fragments of two biquinoline ligands linked together by the four membered metallocycle Cu 2 Cl 2 are coplanar but are shifted with respect to each other in such a way that they form a ladder motif with the distance between the planes equal to 1.95 Å. This shift is apparent ly associated with the tendency to reduce the steric repul sion between the hydrogen atoms of adjacent ligands (anal ogous ladder structures were found in the complexes of biq with nickel(II) 29 and manganese(II) 30 chlorides). The five membered chelate ring adopts an envelope conforma tion with the copper atom deviating from the mean N(1)C(1)C(10)N(2) plane by 0.32 Å.…”