Vasant H. Kulkarni

Transformation of square-planar dsp2 configuration of Ni(II) aldoximates into octahedral sp3d2 configuration by reaction with tin(IV) chloride

Abstract Tin(IV) chloride derivatives of nickel(II) aldoximates have been obtained by reacting tin(IV) chloride with nickel(II) aldoximates in benzene. All the complexes are coloured solids and appear to be non-electrolytes in DMF. Elemental analyses agree with 1:1 stoichiometry. Magnetic, electronic and far i.r. spectral data suggest that the nickel(II) has changed its configuration from dsp2 square-planar to sp3d2 octahedral one as a result of reaction with the tin(IV) chloride. Tin(IV), also exhibits 6-coordination in these complexes.

IR and Möessbauer studies of Sn(IV) complexes with branched tetradentates containing N and O donor centres

Abstract The branched tetradentate ligands prepared by condensing 2,2′-dihydroxychalkones with ethylenediamine are treated with anhydrous tin tetrachloride to yield the complexes of the type Sn · L · Cl2, where L is a doubly deprotonated ligand. The complexes are coloured yellow to greenish yellow. They are non-electrolytes. The IR data suggest the coordination of CN and NH2 groups to the Sn(IV) moiety and the involvement of both the OH groups in the reaction. The vSnO, vSnN and vSnCl vibrations have been assigned. The quadrupole splittings obtained for these complexes are small indicating cis-hexacoordinated Sn(IV) complexes. Considering the nature of the ligands and other spectral observations, we have proposed a polymetric structure for these complexes in which Sn has coordination number six.

Tin(IV) complexes with 2-methoxy-2′-hydroxy chalkones

Abstract Tin(IV) complexes with 2-methoxy-2′-hydroxy-5′-methyl and 2-methoxy-2′-hydroxy-5′-chloro chalkones have been prepared in benzene medium. The elemental analyses indicate Sn·L·Cl 3 stoichiometry (where LH is the ligand). They appear to be non-electrolytes in DMF. They are insoluble in most of the common organic solvents indiating the extended polymeric chain structure. The infrared spectral studies in the region 4000−200 cm −1 suggest that tin(IV) has coordination number six in these complexes.

Komplexe des Blei(IV) mit zweizähnigenSchiffschen Basen

ZusammenfassungEs wurden Komplexe des Blei(IV)chlorids mit zweizähnigenSchiffschen Basen hergestellt. Aus den Analysenergebnissen ergibt sich die Stöchiometrie als 1∶2. Die Komplexe sind inDMF Nichtelektrolyte und scheinen oktaedrische Struktur zu besitzen. Die UV- und IR-Spektren der Komplexe werden diskutiert und mögliche Strukturen vorgeschlagen.AbstractComplexes of lead(IV) chloride with bidentateSchiff bases have been prepared. The analytical data indicate 1∶2 stoichiometry. The complexes are nonelectrolytes inDMF, and appear to be octahedral. The UV and infrared spectra of the complexes are discussed and possible structures have been proposed.

Kupfer(II)-Komplexe mit monofunktionellen dreizähnigenSchiffbasen mit O,N,O-Sequenzen

A few complexes of copper(II) have been prepared by reacting copper(II) acetate with salicylidene methyl anthranilates in alcohol medium. Analytical data indicate 1 : 2 stoichiometry. These copper(II) complexes show normal magnetic moments indicating no spin interactions. With the help of electronic and infrared spectral evidences it has been suggested that in these complexes copper(II) exhibits coordination number six.

Kupfer(II)-Komplexe mit 2,2′-Dihydroxychalkonen

Copper(II) complexes with 2,2′-dihydroxychalkones have been prepared in aqueous alcohol medium and characterised by the elemental analysis. They have 1∶1 stoichiometry and i.r spectra show the involvement of the OH and C=O groups in the bond formation. These copper(II) complexes show magnetic moments in the range of 1.53–1.98 μB and are insoluble in common organic solvents. In view of the magnetic data, solubility and electronic spectral evidences, an extended polymeric structure has been proposed for these complexes.