Abstract
Reaction of molybdate and phosphate precursors in the presence of 3d transition metal ions and pyrazole ( pz) under hydrothermal condition resulted in the crystallization of four new phosphomolybdate cluster based solids: ( pz) 2[{Co( pz) 4} 5{P 2Mo 5O 23} 2]·6H 2O ( 1), ( pz){Ni( pz) 4(H 2O) 2}[{Ni( pz) 4} 5{P 2Mo 5O 23} 2]·2H 2O ( 2), {Cu( pz) 4(H 2O) 2}[{Cu( pz) 4}{Cu( pz) 4(H 2O)}{P 2Mo 5O 23}]·2H 2O ( 3) and ( pz)[{Zn( pz) 3} 3{P 2Mo 5O 23}]·2H 2O ( 4). In all the solids, a metal complex {M( pz) n } covalently links{P 2Mo 5O 23} clusters to form a chain. The dimensionality of the structures differs in the way the chains link or self assemble with counter ions and water molecules. To the best of our knowledge, 4 is the first example of a zinc complex incorporated with {P 2Mo 5O 23} cluster. The paper discusses the self assembly occurring between in situ metal pyrazole complex and phosphomolybdate clusters through coordinate/covalent and noncovalent interactions during crystallization of a particular solid.
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