cis-Dioxomolybdenum(VI) complexes of sterically encumbered phenol-based tetradentate N2O2 ligands: Structural, spectroscopic, and electrochemical studies View Full Text


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Article Info

DATE

2006-12-20

AUTHORS

Debdas Mandal, Rakesh Ganguly, Pabitra Baran Chatterjee, Akira Endo, Timothy J. R. Weakley, Muktimoy Chaudhury

ABSTRACT

Two cis-dioxomolybdenum(VI) complexes [MoO2L] (L: L1, 2 and L: L2, 3) in a phenol-based sterically encumbered N2O2 ligand environment have been synthesized, and their crystallographic characterizations are reported. The orange crystals of 2 are monoclinic, space group P21/a with unit cell dimensions as a=16.2407(17) Å, b=7.2857(8) Å, c=18.400(2) Å, β=98.002(9)°, Z=4, and dcal=1.486 g cm−3. The light orange crystals of 3, however, are orthorhombic, space group, Pbcn, with unit cell dimensions a=8.3110(12) Å, b=12.637(3) Å, c=34.673(5) Å, Z=4, and dcal=1.187 g cm−3. The structures were refined by a full-matrix least-squares procedure on F2 to a final R=0.046 (0.055 for 3) using 4944 (3677) all independent data. In both the cases, the Mo atom exists in a distorted octahedral geometry defined by a N2O4 donor set, which features a cis-Mo(–O)2 and a trans-Mo(OPh)2 arrangement. Compound 2 undergoes a quasireversible one-electron reduction at −1.3 V vs Ag/AgCl reference due to MoVIO2/MoVO2 electron transfer and thus providing a rare example of steric solution to the comproportionation–dimerization problem encountered frequently in the development of valid biomimetic models for the active sites of oxomolybdenum enzymes. More... »

PAGES

187-193

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11224-006-9078-1

DOI

http://dx.doi.org/10.1007/s11224-006-9078-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005470657


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