Synthesis and structural studies of two pyridine-armed reinforced cyclen chelators and their transition metal complexes.

ABSTRACT: Two novel pyridine pendant-armed macrocycles structurally reinforced by an ethyl bridge, either between adjacent nitrogens (for side-bridged) or non-adjacent nitrogens (for cross-bridged), have been synthesized and complexed with a range of transition metal ions (Co²⁺, Ni²⁺, Cu²⁺ and Zn²⁺). X-ray crystal structures of selected cross-bridged complexes were obtained which showed the characteristic cis-V configuration with potential labile cis binding sites. The complexes have been characterized by their electronic spectra and magnetic moments, which show the expected high spin divalent metal complex in most cases. Exceptions are the nickel side-bridged complex, which shows a mixture of high-spin and low spin, and the cobalt cross-bridged complex wh

SUBMITTER: Wilson KR 

PROVIDER: S-EPMC4915379 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature