Synthesis, spectral characterization and X-ray crystal structure of biologically active organotin(IV) 3-[(3′,5′-dimethylphenylamido)]propanoates
作者:F. A. Shah、S. Ali、S. Shahzadi、C. Rizzoli、S. Ahmad
DOI:10.1007/s13738-012-0109-0
日期:2012.12
A new ligand was prepared by reacting 3,5-dimethylaniline with succinic anhydride in glacial acetic acid at room temperature. A series of organotin(IV) carboxylates were prepared by reacting the ligand with R2SnCl2/R3SnCl (R = Me, Bu, Ph, Oct) in 1:2/1:1 molar ratio. The synthesized complexes were characterized by elemental analyses, FT-IR, multinuclear magnetic resonance (1H and 13C) and mass spectrometry. The structures of the ligand (HL) and complex (5) were determined by single crystal X-ray diffraction analysis. FT-IR data shows that the coordination takes place through both carboxylate oxygen atoms. NMR data confirm the tetrahedral geometry in solution. In the crystal structure of ligand (HL), centrosymmetrically related molecules are linked into dimers by N–H…O hydrogen bonding interactions, while in complex (5) coordination around the tin atom is trigonal bipyramidal, with the carbon atoms of the methyl groups occupying the equatorial plane and the O atoms of symmetry-related ligands at the apices. Organotin(IV) complexes were also screened for their antibacterial and antifungal activities, and the results suggested that the synthesized complexes are better antimicrobial agents as compared to the free ligand.
一种新配体通过在室温下将3,5-二甲基苯胺与琥珀酸酐在冰醋酸中反应制备得到。一系列有机锡(IV)羧酸盐通过将该配体与R2SnCl2/R3SnCl(R = Me、Bu、Ph、Oct)以1:2/1:1摩尔比反应制备得到。合成的配合物通过元素分析、傅里叶变换红外光谱(FT-IR)、多核磁共振(1H和13C)和质谱进行了表征。配体(HL)和配合物(5)的结构通过单晶X射线衍射分析确定。FT-IR数据显示配位通过两个羧酸盐氧原子发生。NMR数据显示溶液中为四面体几何结构。在配体(HL)的晶体结构中,中心对称相关的分子通过N–H…O氢键相互作用形成二聚体,而在配合物(5)中,锡原子周围的配位为三角双锥形,甲基碳原子占据赤道平面,对称相关的配体氧原子位于顶点。有机锡(IV)配合物也被筛选了其抗菌和抗真菌活性,结果表明,与自由配体相比,合成的配合物具有更好的抗菌剂效果。