Cobalt(II), Cobalt(III) and Nickel(II) Complexes of some Tetradentate Pyridyl Phthalazines

Bullock, Graham and Cook, Arthur and Foster, Aidan and Rosenberg, Lisa and Thompson, Laurence K (1985) Cobalt(II), Cobalt(III) and Nickel(II) Complexes of some Tetradentate Pyridyl Phthalazines. Inorganica Chimica Acta, 103 (2). pp. 207-215. DOI

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Cobalt(II), cobalt(III) and nickel(II) complexes of a series of tetradentate pyridyl-phthalazine ligands have been studied. Binuclear cobalt(II) and cobalt- (III) derivatives are obtained from aqueous solution with the ligands PAP and PAP4Me (PAP = 1,4-di(2’- pyridyl)aminophthalazine; PAPXMe = 1 ,Cdi(X’-methyl-2’-pyridyl)aminophthalazine), in which three ligands are bound to the binuclear centre. An X-ray study on [(PAP)aCo,(OH),] Br4*9Hz0 shows a binuclear centre involving two octahedral cobalt(III) ions bridged by two hydroxides and involving one tetradentate and two bidentate ligands. Other binuclear cobalt(H) derivatives, [(PAP4Me)Co2Xa] (X = Cl, Br, I, NCS) involve just tetradentate ligand. Binuclear nickel(I1) derivatives are also obtained and in one case, [(PAP)3Ni2(H20)2] Br4*6Hz0, X-ray data indicate a binuclear centre involving two bridging water molecules, a tetradentate bridging ligand and two bidentate ligands. Steric factors involvingmethyl substituents on the pyridine rings are important for PAP6Me, a 6-methyl derivative, and for both cobalt and nickel complexes of this ligand only mononuclear derivatives are obtained.

Item Type: Article
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Inorganica Chimica Acta
Volume: 103
Page Range: pp. 207-215
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 26 Oct 2011 09:29
Last Modified: 23 Jul 2013 10:02

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