Structural variety in mixed cobalt(III)–cobalt(II) chloro-compounds with 1,10-phenanthroline and 2,2′-bipyridyl

Abstract

A variety of different crystalline compounds of the cations cis-[Co(phen)₂Cl₂]⁺, cis-[Co(bipy)₂Cl₂]⁺, and [Co(phen)₃]³⁺(phen = 1,10-phenanthroline, bipy = 2,2′-bipyridyl) with cobalt(II) chloro-anions have been obtained. Some are simple salts of [CoCl₄]^2–, including different hydrates and polymorphs; others are ‘acid adducts’, containing hydrated protons, and one is another salt of the anion [Co(H₂O)Cl₃]^–, first reported in this series. The new crystalline species are assigned the structures : [Co(phen)₃]₂[CoCl₄]₃,nH₂O (2 forms), [Co(phen)₃][CoCl₄]₂[H_2n-1O_n], (8-n)H₂O, [Co(phen)₃][CoCl₄]Cl,4·5H₂O, cis-[Co(phen)₂Cl₂]₂[CoCl₄], cis-[Co(phen)₂Cl₂]₂[CoCl₄][H_2n-1O_n]Cl,(4-n)H₂O, cis-[Co(bipy)₂Cl₂]₂[CoCl₄],nH₂O, cis-[Co(bipy)₂Cl₂][Co(H₂O)-Cl₃],2H₂O, and cis-[Co(bipy)₂Cl₂]₂[CoCl₄]. The X-ray powder diffraction patterns of all new species are listed.