Journal
POLYHEDRON
Volume 96, Issue -, Pages 79-87Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2015.05.001
Keywords
Tridentate ONO donor Schiff base ligands; Molybdenum(VI) complexes; NMR spectroscopy; Oxidative bromination of thymol; Single crystal X-ray analysis
Categories
Funding
- University Grant Commission, New Delhi, India
Ask authors/readers for more resources
Condensation of equimolar amount of 8-formy1-7-hydroxy-4-methylcoumarin (fhmc) and hydrazides [benzoylhydrazide (bhz), isonicotinoylhydrazide (inh), nicotinoylhydrazide (nah) and furoylhydrazide (fah)] in methanol results in the formation of potential ONO tridentate ligands H(2)fhmc-bhz (I), H(2)fhmc-inh (II), H(2)fhmc-nah (III), and H(2)fhmc-fah (IV), respectively. Reaction of these ligands with [(MoO2)-O-vi(acac)(2)] in refluxing methanol gives dioxidomolybdenum(VI) complexes, [(MoO2)-O-vi(fhmc-bhz) (MeOH)] (1), [(MoO2)-O-vi(fhmc-inh)(MeOH)] (2), [(MoO2)-O-vi(fhmc-nah)(MeOH)] (3) and [(MoO2)-O-vi(fhmc-fah) (MeOH)] (4), respectively. The structures of the obtained ligand and their respective metal complexes were elucidated by elemental analyses, spectroscopic techniques (IR, electronic, H-1 and C-13 NMR) and thermogravimetric analyses. Single crystal X-ray analysis of complex 1a confirms the chelation of the ligand to the metal ion through two oxygen and a nitrogen atoms. These metal complexes have been tested against oxidative bromination of monoterpene (thymol) to yield 2-bromothymol, 4-bromothymol and 2,4-dibromothymol using H2O2 as an oxidant therefore they act as functional models of vanadium dependent haloperoxidases. The effects of various factors, such as amounts of catalyst, oxidant, KBr, HClO4 and different solvents have been considered to optimize the reaction conditions for the maximum brominated products. (C) 2015 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available