Correlation of Solid State and Solution Coordination Numbers with Infrared Spectroscopy in Five-, Six-, and Eight-Coordinate Transition Metal Complexes of DOTAM.

ABSTRACT: Three new DOTAM (1,4,7,10-tetrakis(acetamido)-1,4,7,10-tetraazacyclododecane) complexes have been synthesized and characterized by X-ray crystallography: [Co(DOTAM)]Cl₂•3H₂O, [Ni(DOTAM)]Cl₂•4H₂O, and [Cu(DOTAM)](ClO₄)₂•H₂O. Solid state and solution IR spectroscopic features for a series of [M(DOTAM)]²⁺ complexes (M=Mn, Co, Cu, Ni, Ca, Zn) correlate with solid state and solution coordination numbers. [Co(DOTAM)]²⁺, [Ni(DOTAM)]²⁺, and [Zn(DOTAM)]²⁺ are demonstrated to be six-coordinate in both the solid state and in solution, while [Mn(DOTAM)]²⁺ and [Ca(DOTAM)]²⁺ are eight-coordinate in the solid state and remain so in solution. [Cu(DOTAM)]²⁺

SUBMITTER: Nagata MK 

PROVIDER: S-EPMC4955635 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature