title: Interaction of organotin with piperazine derived self-assembled cylindrical bisdithiocarbamates: spectral and thermal investigations.
abstract: Few organotin complexes of the type R4Sn2L2 where R=CH3 (2), C4H9 (3), C6H5 (4), and Sn2L2Cl4 (5) (L=bis(2,2'-dithiopiperazinato-2,2'-diaminodiethylamine)) have been synthesized and suitably characterized by FT-IR, UV-vis, 1H NMR, 119Sn NMR, ESI-MS, TGA/DSC, microanalysis and room temperature molar conductivity data. On the basis of FT-IR spectral studies, a symmetrical bidentate coordination has been proposed for all the complexes while the absence of any higher peak in the ESI-MS may be corroborated with the formation of binuclear complexes. On the basis of 119Sn NMR spectroscopy, six-coordinate geometry has been observed for the Sn-center in all the complexes. The TGA/DSC profile of the complexes implies their higher stability than its precursor. However, on the basis of IDT values the stability order of the organotin complexes was found to be 4>3>2. The room temperature conductivity values of the 1 mM solution of the ligand and its complexes are found to be comparable with that of non-ionic complexes.
authors.affiliation: Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Husain
authors.forename: Shahab A A
authors.initials: SA
authors.lastname: Nami
authors.forename: K S
authors.initials: KS
authors.lastname: Siddiqi
mesh_terms: D002152:Calorimetry, Differential Scanning; D055598:Chemical Phenomena; D015394:Molecular Structure; D009947:Organotin Compounds / Q000737:chemistry*; D000077489:Piperazine; D010879:Piperazines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013053:Spectrophotometry; D013696:Temperature; D013859:Thiocarbamates / Q000737:chemistry*
chemical_list: D009947:Organotin Compounds; D010879:Piperazines; D013859:Thiocarbamates; D000077489:Piperazine