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Dinuclear Manganese(II), Cobalt(II), and Nickel(II) Aryl Phosphates Incorporating 4 '-Chloro-2,2 ':6 ',2 ''-Terpyridine Coligands - Efficient Catalysts for Alcohol Oxidation

Authors
  • BHAT, GA
  • RAJENDRAN, A
  • MURUGAVEL, R
Publication Date
Dec 03, 2018
Source
DSpace at IIT Bombay
Keywords
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Unknown
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Abstract

The dinuclear cyclo(metallo)phosphates [M(dipp)(Cl-terpy)](2) [M = Mn (1), Ni (2)] and the mononuclear cobalt phosphate [Co(dippH)(Cl-terpy)(MeOH)(H2O)]dippH (3) were synthesized through the reactions of 4-chloro-2,2:6,2-terpyridine (Cl-terpy) and 2,6-diisopropylphenyl phosphate (dippH(2)) with manganese, nickel, and cobalt acetates. The formation of 1-3 is supported by spectroscopic, thermogravimetric, and microanalytical data. The molecular structures of 1 and 3 were confirmed by single-crystal X-ray diffraction studies. Compounds 1 and 2 are dimeric and feature two octahedral metal centers bridged by dianionic dipp ligands. On the other hand, 3 exists as a monomer in the solid state, but dissolution in methanol converts it to a dimeric form similar to those of 1 and 2, as evidenced by ESI-MS studies. Compounds 1-3 were employed as catalysts for alcohol oxidation reactions with tert-butyl hydroperoxide (TBHP) as the oxidant. The manganese phosphate 1 exhibits better catalytic activity in terms of selectivity and substrate conversion compared with those of 2 and 3 under similar conditions.

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