Monoorganoantimony(v) phosphonates and phosphoselininates

Abstract

Molecular oxo-hydroxo clusters have been synthesized by reactions of arylstibonic acids with organophosphonic acid and phenylseleninic acid. Single crystal X-ray structural elucidation revealed the formation of [(p-i-PrC6H4Sb)4(OH)4(t-BuPO3)6] (1), [(p-t-BuC6H4Sb)4(O)2(PhPO3)4(PhPO3H)4] (2), [(p-i-PrC6H4Sb)4(O)3(OH)(PhSeO2)2(t-BuPO3)4(t-BuPO3H2)2] (3), [(p-MeC6H4Sb)4(O)3(OH)(PhSeO2)2(t-BuPO3)4(t-BuPO3H2)2] (4) and [(p-t-BuC6H4Sb)2(O) (PhSeO2)2(t-BuPO3H)4] (5) respectively. Mass spectral studies reveal that the clusters maintain their structural integrity in solution as well. Solution NMR studies ((1)H, (31)P and (77)Se) show spectral patterns which correlate well with the observed solid state structures of 1-5.

Seleninic Acid Potassium Salts as Water-Soluble Biocatalysts with Enhanced Bioavailability

“…Till now, seleninic acids have found several application routes, including their utilization as ligands [6][7][8][9][10] and reagents in oxidation [11][12][13][14], dehydrogenation [15] and oxidative deoximation reactions [16]. However, their applicability in medicinal chemistry seems to be still an unexplored field with promising perspectives.…”

Assembling Homometallic Sb6 and Heterometallic Ti4Sb2 Oxo Clusters

“…The solutions were filtered, and on slow evaporation of acetonitrile, crystals were isolated. The detailed synthesis and characterization of these complexes have been reported previously by us and others. ,− …”

“…On the other hand, we have been involved in investigating the chemistry of higher analogues of phosphonic acids, namely organostibonic acids, and have investigated the reaction of organostibonic acids with various protic ligands. Interesting discrete molecular clusters displaying varied geometries such as a cube, a triangle, adamantane, tetrameric butterfly cores, and dodeca- and hexadecanuclear organoantimony-based POM frameworks , have been synthesized and structurally characterized. Very recently, investigations on the reactivity of organophosphonic acids with organostibonic acids have been carried out and structural characterization of the products revealed the formation of novel organostibonate phosphonate clusters of varying shapes and nuclearities.…”

“…Very recently, investigations on the reactivity of organophosphonic acids with organostibonic acids have been carried out and structural characterization of the products revealed the formation of novel organostibonate phosphonate clusters of varying shapes and nuclearities. In this report the synthesized oxo clusters [(RSb) 4 (OH) 4 ( t -BuPO 3 ) 6 ] have been used as proligands and their reactivities independently in the presence of a base and their reactivities in the presence of Ti­(O i Pr) 4 under solvothermal conditions have been investigated. Further, the reported organoantimonate phosphonate dimers [(RSb) 2 (O)­( t -BuPO 3 H) 6 ], which have a varying Sb to P ratio have also been used as starting materials and the aforementioned reactions have been carried out.…”

Tunable bandgaps in self-assembled transition metal-incorporated heterometallic M2Sb4 (M = V, Mn, Co, Ni, and Cu) oxo clusters

“…Solvents and common reagents were purchased from commercial sources. Mixed antimonate-phosphonate proligands [(RSb) 2 (O)( t -BuPO 3 H) 6 ] 10 a and [( p -iPr-C 6 H 4 Sb) 4 (OH) 4 ( t -BuPO 3 ) 6 ] 23 were synthesized by condensation reactions of organostibonic acid with t -butylphosphonic acid. All the compounds used were dried under a high vacuum for half an hour before being subjected to spectroscopic and elemental analyses.…”