Synthesis, Properties and Crystal Structure of Seven‐coordinated Organotin Complex [<i>ⁿ</i>Bu₂Sn(OOCC₅H₄N‐2)₂(H₂O)]

Abstract

Abstract A novel seven‐coordinated organotin complex [ n Bu 2 Sn‐(OOCC 5 H 4 N‐2) 2 (H 2 O)] was unexpectedly synthesized by reaction of n Bu 3 SnCl with 2‐pyridinecarboxylic acid in 1:1 molar ratio in the presence of organic base Et 3 N. The crystal structure was determined by single crystal X‐ray diffraction analysis. The crystal belongs to rhombohedral with space group R‐3c, a = 1.5807(3) nm, b = 1.5807(3) nm, c = 1.5807(3) nm, α = 105.717(2)°, β = 105.717(2)°, γ = 105.717(2)°, Z = 6, V = 3.397(8) nm 3 , D c = 1.452 g/cm 3 , μ = 1.158 mm −1 , F(000) = 1512 , R 1 = 0.0447, wR 2 = 0.1038. In crystal, the tin atoms rendered seven‐coordinate in a distorted pentagonal bipyramidal geometry. The two‐dimensional network structure was formed by H‐bonding interaction between the free oxygen atoms of carboxyl groups and the coordinated water molecules.