Mono and dinuclear group 12 phosphonates derived from a sterically encumbered phosphonic acid: Observation of esterification
作者:Rana Howlader、Mrinalini G. Walawalkar、Ramaswamy Murugavel
DOI:10.1016/j.ica.2013.05.011
日期:2013.8
Metal phosphonates [Zn-2(dtbhp)(2)(TMEDA)(2)(H2O)(2)]center dot 0.5CH(3)CN (1), Cd-2(dtbhp)(2)(TMEDA)(2)(H2O)(2)]center dot 0.5CH(3)CN (2), [Cd-2(mdtbhp)(2)(1,10-phenanthroline)(4)]center dot(ClO4)(2)(CH3OH)(2) (3), and [Cd(dtbhp-H)(2)(2,2'-bpy)(2)](dtbhp-H-2) (4) have been synthesized at room temperature from a reaction between a suitable metal precursor, 3,5-di-tert-butyl-2-hydroxybenzylphosphonic acid (dtbhp-H-2) and an ancillary ligand, tetramethylenethylene diamine (TMEDA), 1,10-phenanthroline and 2,2'-bipyridine; Single crystal X-ray structure determination reveals that compound 1 crystallizes in the orthorhombic Fdd2 space group, while compounds 3 and 4 crystallize in the triclinic P (1) over bar space group. A rare P-O-H bond esterification is observed in compound 3, presumably catalyzed by perchloric acid formed in the reaction. Compounds 1-3 are discrete dinuclear complexes while monomeric complex 4 forms a ID polymeric chain through extended intermolecular hydrogen bonding, aided by free P-OH and P=O groups of the coordinated as well as the lattice phosphonic acid. (C) 2013 Elsevier B.V. All rights reserved.