两个有机锡对碘苯甲酸酯的合成、结构、热稳定性和除草活性

Syntheses, Crystal Structures, Thermal Stability and Herbicidal Activity of Two Organotin 4-Iodobenzoates

在乙醇-苯溶剂中,对碘苯甲酸分别与三苯基氢氧化锡、二丁基氧化锡反应,合成了2个有机锡对碘苯甲酸酯,Ph3Sn(p-IC6H4O2)(1)和{[n-Bu2Sn(p-I-C6H4O2)]2O}2(2)。经IR、1H NMR、元素分析和X射线单晶衍射对配合物进行了表征。配合物1属三斜晶系,空间群为P1,中心锡原子与苯基碳原子、羧基氧原子构成畸型四面体,并且分子间通过氢键和C-I…π共同作用形成二聚体结构;配合物2属单斜晶系,空间群为C2/c,配合物是以Sn2O2构成的平面四元环为中心的二聚体结构,并且分子间通过I…I共同作用形成了一维链状结构。热重分析表明,配合物1和2在230℃以下具有良好的热稳定性。配合物1、2对杂草刺苋(Amaranthus spinosus)、马齿苋(Portulaca oleracea)的抑制活性大于对农作物绿豆的影响,且配合物1的抑制活性高于配合物2的抑制活性,为刺苋、马齿苋除草剂研究提供了一种方法。

The two organotin 4-iodobenzoates, Ph3Sn（ p-I-C6H4O2）（1） and {[n-Bu2Sn（ p-I-C6H4O2）]2O}2（2） have been synthesized by the reaction of triphenyltin hydroxide and dibutyltin oxide with 4-Iodobenzoic acid in ethanol and benzene, respectively. IR,1H NMR, Elemental analysis and X-ray diffraction for the title complexes were presented. The crystal of complex 1 belongs to triclinic, space group P1. The tin atom has a distorted tetrahedral geometry and the dimeric structure is formed by intermolecular hydrogen bonds and C-I … π. The crystal of complex 2 belongs to monoclinic, space group C2/c. The dimer structure is shaped by one Sn2O2 planar fourmembered ring and one-dimensional coordination polymer chain is formed by intermolecular I …I interaction. The thermal gravimetric analysis has showed that： the complexes 1 and 2 are stable below 230 ℃. It is found that the inhibitory activity of compounds 1 and 2 on weeds Amaranthus spinosus and Portulaca oleracea are greater than the effect on crop mung bean, and inhibitory activity of the compound 2 is higher than 1. It provides a method tostudy the herbicide for Amaranthus spinosus and Portulaca oleracea. CCDC： 1039846, 1; 1039847, 2.