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A series of organotin(IV) semicarbazone adducts of the type R 2 SnCl 2 ÁnLH (1-6) were synthesized by the reactions of R 2 SnCl 2 with newly synthesized carvone semicarbazone (LH) in anhydrous ethanol [where R = CH 3 , n = 1 (1), 2 (2); R = C 4 H 9 , n = 1 (3), 2 (4); and R = C 6 H 5 , n = 1 (5), 2 (6)]. All the compounds have been characterized by elemental analyses, FT-IR, NMR ( 1 H, 13 C, 119 Sn) and FAB mass spectral studies. 119 Sn NMR studies suggest monodentate mode of attachment of the ligand with central tin atom in the solution state. Thermogravimetric study of (6) shows large thermal events. Transformations of (4) and (6) to pure tin oxides (i and ii, respectively) have been carried out using sol-gel technique. Powder XRD patterns of the formed tin oxides indicate the formation of tetragonal cassiterite structure. SEM images of (i) and (ii) show wire-and grain-like morphologies of the crystallites, respectively.Graphical Abstract A series of organotin(IV) semicarbazone adducts were synthesized by the reactions of diorganotin dichloride with newly synthesized carvone semicarbazone. Transformations of some of the newly synthesized adducts to pure tin oxides have been carried out using sol-gel technique. Powder XRD patterns of the formed tin oxides indicate the formation of tetragonal cassiterite structure, while SEM images show wire-and grain-like morphologies.

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Reactions of [Al(OPr i ) 3 ] with [VO(OPr i ) 3 ] in presence of halo-acetic acid, CX 3 COOH in anhydrous benzene yielded complexes of the type, [AlVO(OOCCX 3 ) 2 (OPr i ) 4 ], where X = F (1) or Cl (2). The compounds were characterised by elemental analyses, FT-IR and NMR ( 1 H, 27 Al & 51 V) spectral studies. The desired single-phase aluminium vanadate, AlVO 4 , (a & b) have been obtained easily from the precursors, ( 1) and (2), respectively, by the sol-gel process. Formation of triclinic phase in both of the AlVO 4 (a & b) samples was confirmed by powder XRD patterns. SEM image of (b) exhibits formation of nano-grains with agglomers like surface morphologies. Composition of AlVO 4 sample (b) was investigated by EDX analysis, which shows presence of aluminium and vanadium in 1:1 atomic ratio. Absorption spectra of (a) and (b) samples indicate an energy band gap of 3.60 and 3.75 eV, respectively.