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A [2 × 2] Cu 4 molecular grid and a Mn 5 cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene
A JANA, S KONAR, K DAS, S RAY, J A GOLEN, A L RHEINGOLD, S K KAR
Published in Elsevier Ltd
2013
Volume: 62
   
Pages: 51 - 60
Abstract
The homoleptic [2 × 2] tetranuclear compound [Cu 4 (PyPzCAP) 4 ](NO 3 ) 4 ·8H 2 O (1) and the pentanuclear Mn(II) cluster [Mn 5 (PyPzCAP) 6 ](ClO 4 ) 4 ·4C 6 H 6 (2) are self-assembled from the ditopic pro-ligand HPyPz-CAP [(5-methyl-1-(pyridin-2-yl) -N′-[1-(pyridin-2-yl)ethylidene]-1H-pyrazole-3-carbohydrazide)]. Complex 1 is almost a square grid, and all the Cu(II) centers show a distorted octahedral environment with an N 4 O 2 chromophore. Complex 2 has a pentanuclear core with a trigonal bipyramidal arrangement of the Mn(II) atoms. The axial Mn centers bear an N 3 O 3 chromophore and the equatorial centers have an N 4 O 2 distorted octahedral arrangement. Complex 1 shows a ferromagnetic exchange interaction (J= +4.62 cm 1 and g= 2.05), whereas 2 shows weak an antiferromagnetic interaction (J= -2.73 cm 1 and g = 2.02). Both complexes 1 and 2 catalyze the allylic oxidation of cyclohexene to cyclohex-2-ene-1-one with good selectivity and an excellent overall turnover number. © 2013 Elsevier Ltd. All rights reserved.
About the journal
JournalData powered by TypesetPolyhedron
PublisherData powered by TypesetElsevier Ltd
ISSN0277-5387