COORDINATION MODE OF DIHYDROXYBENZOIC ACIDS IN OXORHENIUM(V) COMPLEXES

Abstract Trans -ReOCl 3 (PPh 3 ) 2 reacts with 2,3- and 2,6-dihydroxybenzoic acid (H 2 dhb) in an equimolar ratio in benzene to give the products [ReOCl(2,3-dhb)(PPh 3 ) 2 ] ( 1 ) and [ReOCl(2,6-dhb)(PPh 3 ) 2 ] ( 2 ), respectively. Elemental analysis, infrared, NMR and X-ray crystallographic results indicate that the ligand 2,3-dhb coordinates via the catecholato mode to the metal centre in 1 , but 2,6-dhb functions as a salicylato-type chelate in 2 .