Synthetic and structural studies on copper 1H-[1,10]-phenanthrolin-2-one coordination complexes: isolation of a novel intermediate during 1,10 Phenanthroline hydroxylation

Katherine B Szpakolski, Kay Latham, C J Rix, Johnathan M White, Boujemaa Moubaraki, Keith Spencer Murray

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

The synthesis and crystal Structure elucidation of a novel dinuclear heteroleptic copper(II) complex has led to an alternative mechanism in the formation of covalent hydrates. During further studies on the synthesis and properties of [Cu-2(ophen)(2)] (1), a dinuclear complex of copper(l) with 1H-[1,10]-phenanthrolin-2-one (Hophen), two intermediates/alternative products 2 and 3 were isolated. The dinuclear, antiferromagnetic complex [Cu-2(ophen)(2)(phen)(2)]center dot(NO3)(2)center dot 9H(2)O (3, phen=1,10-phenanthroline) contains two five-coordinate copper(II) ions, both with trigonal-bipyramidal coordination, which are bridged together through deprotonated hydroxyl groups with a Cu-Cu non-bonding distance of 3.100 angstrom. Complex [Cu(phen)(2)(H2O)]center dot-(NO3)(2) (2) is a polymorph of a previously reported material. The occurrence of 2 and 3 has led us to propose a variation to the Gillard mechanism for the formation of covalent hydrates in bidentate N-heterocycles in which the attacking nucleophile may be the deprotonated form of 2, [Cu(phen)(2)(OH)](-), rather than free OH-.
Original languageEnglish
Pages (from-to)1691 - 1696
Number of pages6
JournalChemistry - A European Journal
Volume16
Issue number5
DOIs
Publication statusPublished - 2010

Cite this