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New stable divalent heterocyclic species [SnL1; 1, SnL2; 2] using ONNO and SNNS tetradentate Schiff bases;N,N′-bis(salicylidene)-1,2-bis(o-aminophenoxy)ethane (H2L1) andN,N′-bis(2-aminothiophenol)-1,4-bis(2-carboxaldehydephenoxy)butane (H2L2) were obtained in good yields by alcolysis of the M-N bonds of the divalent precursor Sn[N(SiMe3)2]2by diols. They have been isolated as solids at ambient temperature and are monomeric. FT-IR,1H and119Sn-NMR spectra are suggestive of N … M intramolecular coordination. Then the synthesis and characterization of the new stable mono andcis-disubstituted Sn(II) chromium and tungsten carbonyl complexes [L1Sn]M(CO)5(M= Cr, 3; W, 4); [L2Sn]M(CO)5(M= Cr, 5; W, 6); cis-[L1Sn]2M(CO)4(M= Cr, 7; W, 8) and cis-[L2Sn]2M(CO)4(M= Cr, 9; W, 10) are described. Pentacarbonyl complexes (3–6) were obtained in high yields by treatment of the M(CO)5THF (M= Cr, W) intermediates with the divalent species [SnL1; 1, SnL2; 2] and tetracarbonyl complexes (7–10) were synthesized by the photochemical reactions of [LnSn]M(CO)5with [LnSn] (n = 1, 2). Each of the new carbonyl complexes has been characterized by IR,1H,13C,119Sn-NMR spectroscopy, and mass spectrometry. The sigma donor and pi acceptor ability of the divalent tin species [SnL1, 1; SnL2, 2] as ligands in the transition metal carbonyl complexes (3–10) is discussed by comparing ν(CO) stretching frequencies. [ABSTRACT FROM AUTHOR]

Thirteen new stannacyclododecane dithiocarbamate complexes have been prepared by reacting 12-chloro-12-n-butyl-1,11-dioxa-4,8-dithia-12-stannacyclododecane (1) and 12-chloro-12-n-butyl-1,4,8,11-tetrathia-12-stannacyclododecane (2) with pyrrolidine-, morpholine-, thiomorpholine-, piperidine-, piperazinebis-, and 3-pyrroline-carbodithioates, respectively, as well as with diethyl-dithiocarbamate. All complexes were characterized by elemental analyses, IR, EI-MS, and NMR (1H, 13C, and 119Sn) studies. The spectroscopic data suggest the replacement of the chlorides by the corresponding dithiocarbamates with monodentate coordination, leading to six-coordinate tin atoms in all the cases. [ABSTRACT FROM AUTHOR]

Photolysis of 2-(trimethylstannyloxy)-3,6-di-tert-butyl-benzquinone-1,4 (I), 2-(triphenylstannyloxy)-3,6-di-tert-butyl-benzquinone-1,4 (II), and 2-(tribenzylstannyloxy)-3,6-di-tert-butyl-benzquinone-1,4 (III) by light with the wavelength 436 nm leads to the evolution of carbon mono- and dioxide and the formation of hydrocarbon radicals with their consequent recombination. GRAPHICAL ABSTRACT[image omitted] [ABSTRACT FROM AUTHOR]

The reaction of bis(anilino)phosphine oxide (C6H5NH)2P(O)H, 1 with Bu2nSnCl2 in the presence of an excess of triethylamine (TEA) in dry tetrahydrofurane (THF) yields the novel N,O-bonded tin complex Bu2nSn[NPh(O)P(H)NPh(HNEt3)]2, 2. TEA is used as a base to deprotonate the phosphazane ligand and is separated as Et3NH+Cl-, whereas HTEA+ exists in the final product 2 and act as a charge balancing and H-bond structure--directing agent. This new compound has been fully characterized by means of IR, MS, and multinuelear (¹H, 31P, and 119Sn NMR) spectroscopy. [ABSTRACT FROM AUTHOR]

A facile synthesis and studies on the stereochemistry and biochemical aspects of some organosilicon(IV), organotin(IV), and manganese(II) complexes derived from imine having N∪N∪O donor system is reported. The imine was prepared by the condensation of salicylanilide with sulphathiazole. This imine reacts with organosilicon(IV)chloride, organotin(IV)chloride, and hydrated manganese(II) chloride to yield compounds having M─O and M←N bonds. The structures of the compounds have been elucidated by physicochemical and spectral (IR, 1H NMR, 13C NMR, 29Si NMR, 119Sn NMR, and ESR) studies, which clearly point to a trigonal bipyramidal geometry around silicon(IV) and tin(IV), and tetrahedral geometry around manganese(II), as the active lone pair of the nitrogen is also included in the coordination sphere. In the search for better fungicides and bactericides, studies were conducted to assess the growth-inhibiting potential of the synthesized complexes against various pathogenic fungal and bacterial strains. These complexes are highly active against nematode (Meloidogyneincognita) and insect (Trogodermagranarium). The activity will be increased with increasing concentration. These studies demonstrate that the concentrations reached levels that are sufficient to inhibit and kill the pathogens. All compounds have also been found to act as sterilizing agents by reducing the production of sperm in male mice. [ABSTRACT FROM AUTHOR]