201741-76-6Relevant academic research and scientific papers
Facile one-pot synthesis of triphenylbismuth(V) bis(carboxylate) complexes
Kumar, Ish,Bhattacharya, Prateek,Whitmire, Kenton H.
, p. 2906 - 2909 (2014/06/24)
Triphenylbismuth(V) bis(carboxylates), Ph3Bi(O 2CR)2 (R = 5-Br-2-OH-C6H3 (1), 2-OH-C6H4 (2), 2,6-(OH)2-C6H 3 (3), 3-Me-2-NH2-C6H3 (4), Ph (5), Me (6)), were obtained from the reaction of triphenylbismuth with hydrogen peroxide and excess carboxylic acid in wet 2-propanol. The synthesis avoids the use of halogens as oxidants, and the products crystallize directly from the solution as pure compounds. They crystallize from solution without further need for purification. The structures of 1-5 were confirmed by single-crystal X-ray diffraction. Compounds 2 and 5 exhibit a polymorph different from that previously reported in the literature. While all of the Bi(V) compounds adopt a trans-axial trigonal-bipyramidal configuration with the carboxylates in axial positions, there is considerable variation in the coordination of the carboxylate that ranges from simple η1 to a mixture of mono- and bidentate chelating bonding modes.
Characterising secondary bonding interactions within triaryl organoantimony(v) and organobismuth(v) complexes
Barucki, Hubert,Coles, Simon J.,Costello, James F.,Gelbrich, Thomas,Hursthouse, Michael B.
, p. 2319 - 2325 (2007/10/03)
The thermodynamically preferred conformations of the five-co-ordinate trigonal-bipyramidal complexes SbPh3CI21 and BiPh3Cl2 2, determined via van der Waals energy calculations, have been found to be in good agreement with the corresponding correlated propeller arrangements which are observed in the solid state. However, similar calculations upon the corresponding diesters SbPh3(O2CR): 3 and BiPhj(O2CR)2 4 [R = C(OH)Ph2 a or C6H4OH-o b] were at variance with the solid state, thereby indicating the participation of stabilising secondary bonding interactions between the metal centre and the carbonyl oxygen atom of the ester moiety. In accord with current Lewis acid-base bonding models, a strong correlation was found to exist between the pATa of the parent acid and the magnitude of the M ... O=C interaction. The complexes 3a,3b and 4a,4b were prepared in order to probe the effect of strong intramolecular hydrogen bonding upon the ability of ester ligands to stabilise sterically disfavoured conformations via anb donation. Single crystal X-ray analyses of 3a,3b and 4a demonstrate that although significant attenuation of the M ... O=C interaction is achieved via strong intramolecular hydrogen bonding,: sterically disfavoured arrangements predominate in the solid state. The Royal Society of Chemistry 2000.
