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The studies ofeffects of pyridyl ring alkylated tachpyr (tach- n -Me-py , r n =3, 4, 5, and 6) on complexation of Mn(II), Fe(II), Ni(II),Cu(II) and Zn(II) were also investigated. The steric repul-sions between the 6-substituents at the threefold axis of thepseudo-octahedral coordination sphere in the 6-alkylatedcomplexes result in a substantially weakened metal-ligandinteraction, cause bond angle and length distortions,decrease of the coordination number to five, and shift of d-delectronic transitions to lower energies.

bulletin of the korean chemical society

Zn(II) Complex of Tachquin, N,N',N''-Tris(2-quinolinylmethyl)-cis,cis-1,3,5-triaminocyclohexane); Synthesis and X-ray Structure of [Zn(tachquin)](ClO4)2.H2O