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A Bis(μ‐phenoxo)‐Bridged Dizinc Complex with Hydrolytic Activity
Author(s) -
Mitra Mainak,
Singh Reena,
PyrkoszBulska Monika,
Haukka Matti,
GumiennaKontecka Elzbieta,
Nordlander Ebbe
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300160
Subject(s) - chemistry , deprotonation , ligand (biochemistry) , carboxylate , hydrolysis , pentagonal bipyramidal molecular geometry , stereochemistry , coordination sphere , crystal structure , crystallography , metal , hydrogen bond , methanol , medicinal chemistry , trigonal bipyramidal molecular geometry , inorganic chemistry , ion , molecule , organic chemistry , biochemistry , receptor
The dinuclear complex [Zn 2 (papy) 2 ] · 2CH 3 OH [H 2 papy = N ‐(2‐hydroxybenzyl)‐ N ‐(2‐picolyl)glycine] was synthesized and characterized. The crystal structure of the complex reveals that both Zn II ions are pentacoordinate with distorted pentagonal bipyramidal coordination arrangements. The phenoxyl groups of each ligand bridge the two metal atoms, whereas each carboxylate of the ligand is terminally bound to one Zn II ion. Potentiometric studies of the Zn II :H 2 papy system in a methanol/water mixture show the existence of a mononuclear species at lower pH; but at a pH above 5, a dimeric species starts to dominate and transforms further into a bis(μ‐phenoxo) bridged dizinc complex by deprotonation of phenolic hydrogen. A kinetic study of the hydrolysis of bis(2, 4‐dinitrophenyl)phosphate at different pH, catalyzed by complex 1 , indicates a maximum rate at pH 9, where the bis(μ‐phenoxo)‐bridged dizinc species corresponding to 1 dominates in solution.