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Polynuclear oxomolybdenum(VI) complexes of dihydroxybenzoic acids: Synthesis, spectroscopic and structure characterization of a tetranuclear catecholato-type coordinated 2,3-dihydroxybenzoate and a novel tridentate salicylato-type coordinated 2,5-dihydroxybenzoate trinuclear complex by Charalambos Litos; Aris Terzis; Catherine Raptopoulou; Aliki Rontoyianni; Alexandra Karaliota is a Chemistry article available to read on EtoBox.

What is Polynuclear oxomolybdenum(VI) complexes of dihydroxybenzoic acids: Synthesis, spectroscopic and structure characterization of a tetranuclear catecholato-type coordinated 2,3-dihydroxybenzoate and a novel tridentate salicylato-type coordinated 2,5-dihydroxybenzoate trinuclear complex about?

In order to study the reaction of molybdenum(VI) with dihydroxybenzoic acids (DHBAs), compounds (PPh 4 ) 2 AE [Mo 4 O 6 (l-O) 4 -(l 3 -OCH 3 ) 2 (2,3-DHBA) 2 ] (1) and (PPh 4 ) 2 AE [Mo 3 O 6 (l-O) 2 (2,5-DHBA) 2 ] AE CH 3 CN (2) were isolated and determined by X-ray crystallography. The structure of complex 1 consists of four distorted MoO 6 octahedra with two cis-MoO 2 2þ units and two molybdenum atoms having each ligand coordinated and one terminal oxygen atom, while two triple bridged methanol molecules are present. The ligand 2,3dihydroxybenzoic acid (2,3-DHBA) prefers the catecholate-type coordination with strong hydrogen bonding between the carboxylic hydrogen and the ortho-phenolic oxygen. The structure of complex 2 consists of three distorted MoO 6 octahedra. The 2,5-dihydroxybenzoic acid (2,5-DHBA) acts as a tridentate ligand using both carboxyl oxygen atoms, giving thus an unusual trinuclear molybdenum complex with a unique coordination mode of the ligand. The compounds were further investigated using IR, UV-Vis, ESR and NMR spectroscopy, elemental and thermogravimetric analysis, as well as cyclic voltammetry.

Who reads Polynuclear oxomolybdenum(VI) complexes of dihydroxybenzoic acids: Synthesis, spectroscopic and structure characterization of a tetranuclear catecholato-type coordinated 2,3-dihydroxybenzoate and a novel tridentate salicylato-type coordinated 2,5-dihydroxybenzoate trinuclear complex?

Author

Charalambos Litos; Aris Terzis; Catherine Raptopoulou; Aliki Rontoyianni; Alexandra Karaliota

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0277-5387)

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)