Self-assembly syntheses and crystal structures of triorganotin(IV) pyridinecarboxylate: 1D polymers and a 42-membered macrocycle

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: [R 3Sn (6-OH-3-nic)·L] n ( I) (R = Ph, L = Ph·EtOH, 1; R = Bn, L = H 2O·EtOH, 2; R = Me, L = 0, 3; R = n-Bu, L = 0, 4), [R 3Sn (5-OH-3-nic)] n ( II) (R = Ph, 5; R = Bn, 6; R = Me, 7; R = n-Bu, 8), [R 3Sn (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.