Chunlin Ma

Synthesis and structure of a novel trinuclear 18-membered macrocycle of diphenyltin complexes with 2-mercaptonicotinic acid

Abstract The 18-membered stereoregular diphenyltin macrocycles: {Ph2Sn[S(C6H3NO)O]}3 (8), {Ph2Sn[S(C6H3NO)O]}3·2.67H2O (9) and {Ph2Sn[S(C6H3NO)O]}3·4C6H6 (10) have been synthesized by the reaction of diphenyltin dichloride with 2-mercaptonicotinic acid. The three complexes were characterized by elemental, IR, 1H-NMR analyses. The X-ray crystallography analyses of 9 and 10 were also given. Single crystal X-ray diffraction data reveal that both 9 and 10 are highly symmetrical tri-nuclear cyclic complexes with the ligand 2-mercaptonicotinic acid bridging the adjacent tin atoms. The tin environment is distorted cis-trigonal bipyramid. Weak interaction Sn⋯O was recognized between tin and exocyclic-oxygen atoms. The potential tridentate of endocyclic sulfur atoms make them interesting ligands.

Synthesis and crystal structure of a novel pentanuclear complex of tin (IV) with heterocyclic sulfur and nitrogen donor ligands

Abstract A novel macrocyclic complex of organotin was synthesized by the reaction of dibutyltin dichloride with 2,5-dimercapto-1,3,4-thiodiazole. The title pentanuclear complex of tin is a 35-membered macrocycle. All five Sn atoms are six-coordinate, and have distorted octahedron geometries due to intramolecular Sn–N interactions. The title complex is characterized by Elemental analysis, IR, 1 H-NMR spectroscopy and X-ray diffraction.

Drum-shaped mono-organooxotin assembly through solvothermal synthesis with 2,3,4,5-tetrafluorobenzoic acid: crystal structure, hydrogen bonding and π–π stacking interactions

A drum-shaped organooxotin (IV) complex with 2,3,4,5-tetrafluorobenzoic acid of the type {[SnR2(2,3,4,5-F4C6HCO2)]O}6 (Ru2009=u2009m-Cl-PhCH2) has been solvothermally synthesized and structurally characterized by elemental, IR, 1H, 13C, 119Sn NMR spectra and X-ray crystallography diffraction analysis. This complex exhibits a new structural environment appearing as a “drum” arrangement with hexa-coordinated tin atoms in a four-membered stannoxane ring, (–Sn–O–)2, as a common structural feature. Each tin(IV) displays a distorted octahedral geometry. Weak, but significant, intramolecular C–Hu2009···u2009F hydrogen bonds and π–π stacking interactions are shown. These contacts lead to aggregation and supramolecular self-assembly. Cleavage of Sn–C bond occurred in complexes under the influence of strong acid.

Syntheses, characterization and crystal structures of new organogermanium complexes with 2,5-dimercapto-4-phenyl-1,3,4-thiodiazole

Abstract A series of organogermanium(IV) complexes with 2,5-dimercapto-4-phenyl-1,3,4-thiodiazole of the type, RnGe[S(C8H5N2S2)]4−n (n=3, R=CH3, 1; C2H5, 2; C4H9, 3; C6H5, 4; n=2, R=CH3, 5; C2H5, 6; C4H9, 7; C6H5, 8) have been synthesized. All the complexes 1–8 have been characterized by elemental, IR and 1H NMR analyses. Among them complexes 4 and 8 have also been characterized by X-ray crystallography diffraction analyses, which revealed that the structure of complex 4 is a tetrahedron while the germanium environment of complex 8 is a distorted octahedron. Furthermore, an intermolecular non-bonded sulfur–sulfur interaction was recognized in complex 8. The IR and 1H NMR spectral data indicate such an inclination that those structures of trialkylgermanium derivatives are apt to be four-coordinated and those of dialkylgermanium derivatives are likely to be six-coordinated.