Syntheses and crystal structures of piperazine-1,4-diylbis(methylene)bis(phosphonic acid)hydrochloride, [H 5L]Cl, and its complex with cadmium(II), [Cd(OH)(H 3L)(H 2O) 3] n·nH 2O

Synthesis of the polymeric complex [Cd(OH)(H 3L)(H 2O) n·nH 2O ( I) [H 4L = piperazine-1,4-diylbis(methylene)bis(phosphonic acid), ( II)] and X-ray crystal structures of I and II·HCl are reported. In I, the phosphonic acid coordinates as a monoanionic zwitterion through one oxygen atom of each phosp...

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Bibliographic Details
Published inPolyhedron Vol. 13; no. 5; pp. 847 - 850
Main Authors Choi, Nick, Khan, Imtiaz, Matthews, Ray W., McPartlin, Mary, Murphy, Brian P.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 1994
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Summary:Synthesis of the polymeric complex [Cd(OH)(H 3L)(H 2O) n·nH 2O ( I) [H 4L = piperazine-1,4-diylbis(methylene)bis(phosphonic acid), ( II)] and X-ray crystal structures of I and II·HCl are reported. In I, the phosphonic acid coordinates as a monoanionic zwitterion through one oxygen atom of each phosphonate group to give polymeric chains of Cd atoms bridged through the organic function of the ligands. Three water molecules and one hydroxo ligand complete the approximately octahedral coordination sphere around cadmium. The piperazine ring has the chair conformation in both I and II · HCl, and II can be regarded as doubly zwitterionic.
ISSN:0277-5387
DOI:10.1016/S0277-5387(00)81693-9