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The reactions of [Zn 3 Cl 2 (3,5-Me 2 PzH) 4 ( t -BuPO 3 ) 2 ] with organostibonic acid in varying reaction conditions have been investigated. Single-crystal X-ray diffraction studies reveal the formation of [Zn 2 ( p -ClC 6 H 4 Sb) 2 (O) 2 (OCH 3 ) 2 ( t -BuPO 3 ) 3 (py) 2 ] ( 1 ), [Zn 2 ( p -ClC 6 H 4 Sb V ) 4 (Sb III ) 2 (O) 8 ( t -BuPO 3 H) 4 ( t -BuPO 3 ) 2 (py) 2 Cl 2 ] ( 2 ), and [Zn 2 (RSb) 4 (O) 4 (OCH 3 ) 4 ( t -BuPO 3 ) 4 (py) 2 ], where R = p -ClC 6 H 4 ( 3 ) and R = p -iPrC 6 H 4 ( 4 ), respectively. Interestingly, in the synthesis of 2 , complete dearylation of organoantimony moieties followed by C-F bond formation, a reduction from Sb (V) to Sb (III), and Sb···Cl weak intermolecular interactions have been observed. ESI-MS studies suggested that clusters 1 - 4 maintained their structural integrity in the solution state also. Solution NMR studies ( 1 H, 31 P, and 13 C) support well the observed solid-state structures. 1 - 4 were tested for antibacterial activity using a microdilution assay. 1 and 4 showed the best activity with lower MIC values (0.78-6.25 μg/mL) against all the tested pathogens. The total antioxidant activity of 1 - 4 was evaluated through the phosphomolybdenum assay, which showed a total antioxidant activity ranging from 28.96 to 86.46 mg AAE/g compound with the ascorbic acid standard.

Isolation and structural characterization of novel organoantimony(V)-based oxo clusters are reported. (RSb) 4 (OH) 4 ( t -BuPO 3 ) 6 and (RSb) 2 (O)( t -BuPO 3 H) 6 independently in the presence of pyridine under solvothermal conditions afford the hexanuclear organoantimonate clusters [(RSb) 6 (μ 3 -O) 2 (μ 2 -O) 6 ( t -BuPO 3 ) 4 ], where R = p - i -PrC 6 H 4 ( 1 ), p -ClC 6 H 4 ( 2 ). Further, reaction of organostibonate phosphonate with Ti(O i Pr) 4 in the presence of pyridine under solvothermal conditions afforded the mixed-metal titanium stibonate hexanuclear clusters [(RSb) 2 Ti 4 (μ 3 -O) 2 (μ 2 -O) 2 ( t -BuPO 3 ) 4 (μ-OCH 3 ) 4 (OCH 3 ) 4 ], where R = p - i -PrC 6 H 4 ( 3 ), p -ClC 6 H 4 ( 4 ). Band gap measurements were performed on 1 - 4 . They reveal a remarkable reduction in the band gap on moving from the heavier main-group-based oxo cages ( 1 and 2 ) to the titanium-incorporated oxo cages ( 3 and 4 ).

The reaction of organobismuth precursors with trityl- H -phosphinic acid in varying reaction conditions afforded colorless crystals, whose single crystal X-ray characterization revealed the formation of monomer {(Ph 3 Bi)[(Ph 3 C)(H)PO 2 ] 2 }· 3 / 2 (CH 3 CN) 2 . 1 / 2 H 2 O ( 1 ) and butterfly shaped tetranuclear cluster Bi 4 (μ 3 -O) 2 [(Ph 3 C)(H)(PO 2 )] 8 ·2CH 2 Cl 2 · 1 / 2 CH 3 CN.2H 2 O ( 2 ). The reaction of titanium isopropoxide with two different phosphinic acids trityl- H -phosphinic acid and cyc P(O)(OH) led to isolation of cubane type octahedral complex {Ti 8 (μ 2 -O) 8 (μ 2 -OH) 4 [(Ph 3 C)(H)PO 2 ] 12 }[3C 7 H 8 ] ( 3 ) and hexanuclear complex Ti 6 (μ 2 - cyc PO 2 ) 9 (μ 2 -O) 6 (μ 2 -OH) 3 ·4CH 3 CN·4H 2 O ( 4 ) respectively.