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Abstract: Eight new organotin (IV) carboxylates, (R3Sn)4(nap)4 (R = Me 1, n-Bu 2), [(R3Sn) (nap)] n (R = Ph 3, PhCH2 4), (R2Sn) (nap)2 (R = n-Bu 5, Ph 6, PhCH2 7) and {[R2Sn(nap)]2O}2 (R = Me 8) (nap = (S)-(+)-6-methoxy-α-methyl-2-naphthaleneaceto anion) have been synthesized. All of the complexes have been characterized by elemental analysis, FT–IR, NMR (1H, 13C and 119Sn) spectra. Among these complexes, complexes 1, 3, 5 and 8 were also characterized by X-ray crystallography diffraction analysis, and the data of X-ray crystallography diffraction indicated that complexes 1, 3 and 5 are new chiral organotin (IV) carboxylates complexes. The structural analyses show that complex 1 has a tetranuclear Sn4O8 macrocycle structure, complex 3 has a 1D spring-like chiral helical chain with a columnar channel, complex 5 possesses a dimer structure, and complex 8 has a supramolecular chainlike ladder structure through weak intermolecular non-covalent O…O interactions. [Copyright &y& Elsevier]

Abstract: A series of new triorganotin(IV) pyridinecarboxylates with 6-hydroxynicotinic acid (6-OH-3-nicH), 5-hydroxynicotinic acid (5-OH-3-nicH) and 2-hydroxyisonicotinic acid (2-OH-4-isonicH) of the types: [R3Sn (6-OH-3-nic)·L] n (I) (R=Ph, L=Ph·EtOH, 1; R=Bn, L=H2O·EtOH, 2; R=Me, L=0, 3; R= n-Bu, L=0, 4), [R3Sn (5-OH-3-nic)] n (II) (R=Ph, 5; R=Bn, 6; R=Me, 7; R= n-Bu, 8), [R3Sn (2-OH-4-isonic·L)] n (III) (R=Bn, 9, L=MeOH; R=Me, L=0, 10; R=Ph, 11, L=0.5EtOH) have been synthesized. All the complexes were characterized by elemental analysis, TGA, IR and NMR (1H, 13C, 119Sn) spectroscopy analyses. Among them, except for complexes 5 and 6, all complexes were also characterized by X-ray crystallography diffraction analysis. Crystal structures show that complexes 1–10 adopt 1D infinite chain structures which are generated by the bidentate O, O or N, O and the five-coordinated tin centers. Significant O–H⋯O, and N–H⋯O intermolecular hydrogen bonds stabilize these structures. Complex 11 is a 42-membered macrocycle containing six tin atoms, and forms a 2D network by intermolecular N–H⋯O hydrogen. [Copyright &y& Elsevier]

Abstract: Eight new organoantimony(V) complexes with 1-phenyl-1H-tetrazole-5-thiol [L1H] and 2,5-dimercapto-4-phenyl-1,3,4-thiodiazole [L2H] of the type R n SbL5− n (L=L1: n =4, R= n-Bu 1, Ph 2, n =3, R=Me 3, Ph 4; L=L2: n =4, R= n-Bu 5, Ph 6, n =3, R=Me 7, Ph 8) have been synthesized. All the complexes 1–8 have been characterized by elemental, FT-IR, 1H and 13C NMR analyses. Among them complexes 2, 6 and 8 have also been confirmed by X-ray crystallography. The structure analyses show that the antimony atoms in complexes 2 and 6 display a trigonal bipyramid geometry, while it displays a distorted capped trigonal prism in complex 8 with two intramolecular Sb⋯N weak interactions. Furthermore, the supramolecular structure of 2 has been found to consist of one-dimensional linear molecular chain built up by intermolecular C–H⋯N weak hydrogen bonds, while a macrocyclic dimer has been found in complex 6 linked by intermolecular C–H⋯S weak hydrogen bonds with head-to-tail arrangement. Interestingly, one-dimensional helical chain is recognized in complex 8, which is connected by intermolecular C–H⋯S weak hydrogen bonds. [Copyright &y& Elsevier]

Abstract: A series of new triorganotin(IV) complexes with 4-hydroxy-2-mercapto-6-methylpyrimidine (L1H2), 4-hydroxy-2-mercapto-pyrimidine (L2H2), 2,4(1H,3H)-pyrimidinedithione (L3H2) () of the type R3SnLSnR3 (R=Me 1, 4, 7; R=Ph 2, 5, 8; R=PhCH2 3, 6, 9) have been synthesized by reactions of triorganotin(IV) chloride and corresponding ligands. All complexes are characterized by elemental analyses, IR spectra and NMR spectra analyses. Among them, complexes 2, 5 and 8 are also characterized by X-ray crystallography diffraction analyses. Significant π⋯π stacking, C–H⋯π interactions and intramolecular hydrogen bonds stabilize these structures. [Copyright &y& Elsevier]

Abstract: The triorganotin(IV) derivatives of 2-mercapto-4-quinazolinone (HSqualone) of the type, R3SnL (R=Ph 1, CH3 2, PhCH2 3, p-F-PhCH2 4, o-F-PhCH2 5, n-Bu 6), were obtained by the reaction of the R3SnCl and HSqualone with 1:1 molar ratio in benzene. All complexes 1–6 were characterized by elemental analyses, IR, 1H and 13C NMR spectroscopy and the crystal structures of complexes 1–3 were also confirmed by X–ray crystallography. The structure analyses reveal that the tin atoms of complexes 1–3 are all distorted tetrahedral geometries. Furthermore, the dimeric structures in complexes 1–3 have also been found linked by intermolecular O–H⋯N or N–H⋯O hydrogen bonding interaction. Interestingly, the dimers of complexes 2 and 3 are further linked into one-dimensional chain through intermolecular C–H⋯S and C–H⋯O weak hydrogen bonding interactions, respectively. [Copyright &y& Elsevier]

Two types of di-n-butyltin(IV) complexes {[nBu2Sn(O2CR)]2O}2 · L 1–4 and nBu2Sn(O2CR)2Y 5–8 (when L=H2O, R=2-pyrazine 1; L=0, R=2-pyrimidylthiomethylene 2, 1-naphthoxymethylene 3; L=C6H6, R=2-naphthoxymethylene 4; when Y=H2O, R=2-pyrazine 5; Y=0, R=2-pyrimidylthiomethylene 6, 1-naphthoxymethylene 7, 2-naphthoxymethylene 8) have been prepared in 1:1 or 1:2 molar ratios by reactions of di-n-butyltin oxide with the heteroatomic (N, O or S) carboxylic acids. The complexes 1–8 are characterized by elemental, IR, 1H and 13C NMR spectra. And except for complexes 6 and 7, the complexes 1–5 and 8 are also characterized by X-ray crystallography diffraction analyses, which reveal that the tin atom of complex 5 is seven-coordinated, while the complexes 1–4 and 8 are all hexa-coordinated. The nitrogen atom of the aromatic ring in complexes 1 and 5 participates in the interactions with the Sn atom. [Copyright &y& Elsevier]

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. [Copyright &y& Elsevier]

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, 1H-NMR spectroscopy and X-ray diffraction. [Copyright &y& Elsevier]

Reaction of tri(o-fluorobenzyl)tin chloride with sodium of heteroaromatic carboxylic acid in 1:1 stoichiometry yielded complexes of the type (2-F-Bz)3SnOOCR (R=2-furanyl, 2-furanvingl, 2-thiophenyl, 2-pyridinyl, 3-pyridinyl, 4-pyridinyl, 3-indolyl, 3-indolmethyl and 3-indolpropyl), respectively. These complexes have been characterized by elemental analyses, IR and 1H NMR spectroscopy. The crystal structures of tri(o-fluorobenzyl)tin esters of 4-pyridinecarboxylic acid (5) and 3-pyridinecarboxylic acid (6) were determined by single crystal X-ray diffraction. In the crystals of compounds 5 and 6, the tin atoms are rendered five-coordinate in a trigonal bipyramidal structure by coordinating with pyridine N atom of carboxylate group. The resulting structure is a one-dimensional linear polymer containing Sn–O bond lengths of 2.161(4), 2.202(9) A˚ and Sn–N bond lengths of 2.518(5), 2.454(10) A˚. [Copyright &y& Elsevier]