碳链长度对芳香异羟肟酸二烃基锡配合物与5’-AMP或DNA相互作用的影响

选择体外筛选活性强的Bu₂Sn(4-FC₆H₄C(O)NHO)₂和活性弱的有机锡化合物Me₂Sn(4-FC₆H₄C(O)NHO)₂为模型,利用高分辨¹H NMR和³¹P NMR 技术比较研究这两个有代表性的有机锡化合物与DNA的基本组成单元5’-AMP在不同时间、不同条件下的作用模式并用紫外法进一步研究其与DNA的相互作用。结果显示,具有不同碳链的有机锡化合物与5’-AMP相互作用明显不同,含较长碳链的Bu₂Sn(4-FC₆H₄C(O)NHO)₂与5’-AMP的作用明显强于Me₂Sn(4-FC₆H₄C(O)NHO)₂,Me₂Sn(4-FC₆H₄C(O)NHO)₂分子可能只与5’-AMP的磷酸骨架静电结合,与整个分子作用较弱,而含丁基的Bu₂Sn(4-FC₆H₄C(O)NHO)₂可能除了与磷酸骨架静电结合,也与疏水碱基具有超分子相互作用而更有利于与5’-AMP稳定结合。Bu₂Sn(4-FC₆H₄C(O)NHO)₂的长链有机配体在与DNA的作用模式上发挥了重要作用。     

Syntheses and crystal structures of diorganotin(IV) bis(2‐pyridinethiolato‐N‐oxide) complexes

The complexes di‐n‐butyldi(2‐pyridinethiolato‐N‐oxide)tin(IV) (1), diphenyldi(2‐pyridinethiolato‐N‐oxide)tin(IV) ( 2 ) and dibenzyldi(2‐pyridinethiolato‐N‐oxide)tin(IV) ( 3 ) are synthesized and characterized by elemental analyses, IR, ¹H, ¹³C, ¹¹⁹Sn NMR spectroscopy, and their structures are determined by X‐ray crystallography. In complex 1 the coordination geometry at tin is a skew‐trapezoidal bipyramid, with cis‐S,S and cis‐O,O atoms occupying the trapezoidal plane and two n‐butyl groups occupying the apical positions, which also exhibits strong π–π stacking interactions. In complexes 2 and 3 the geometry at tin is distorted cis‐octahedral, with cis‐O,O and cis‐C,C atoms occupying the equatorial plane and trans‐S,S atoms occupying the apical positions. Their in vitro cytotoxicity against two human tumour cell lines, MCF‐7 and WiDr is reported. The ID₅₀ values found are comparable to those found for cis‐platin, but lower than for many other diorganotin compounds. Copyright © 2003 John Wiley & Sons, Ltd.     

The direct synthesis of triorganotin compounds: Process and reaction mechanism

The reaction of tin metal with alkyl halides in the presence of a stoichiometric amount of halide ion rapidly produces very high yields of triorganotin halides. An overview of these reaction conditions and those required for the catalytic preparation of diorganotin dihalides shows that these preparations follow the normal reactivity of the alkyl halides towards nucleophiles. Both processes are satisfactorily explained by a mechanism involving tin halogenoanions as nucleophiles. A similar mechanism also explains the formation of organomagnesium and organozinc halides.     

Synthesis,Characterization and in vitro Antitumour Activity of the Di—n—butyltin（IV） Complexes of Some Arylhydroxamates

Fourteen new di-n-butyltin(IV)complexes of hydroxamic acids of the formula Bu2SnL2(HL-hydroxamic acids)were synthesized by the reaction of Bu2SnO and hydroxamic acids in dry toluene and ethanol media.The compounds were characterized by elemental analyses,molecular weight,IR and 1H NMR spectoscopy.The results indicate that n-Bu2SnL2 have distorted trans-octahedral structure.The antitumor activity in vitro against human A-549 tumor cells and P388 leukemia was presented,and their structure-activity relationship was discussed.     

Synthesis and biological activity of trinuclear seven-coordinated tin(IV) complexes derived from tridentate ligands and trimesic acid

The synthesis of trinuclear Sn(IV) complexes 5a–h – prepared in a one-pot reaction of 2-amino-4-R-phenol (R=H, Me, Cl, NO₂), 2-pyridine-carboxaldehyde, 1,3,5-benzenetricarboxylic acid (trimesic acid, H₃BTC), and dibutyl and dioctyltin oxides – is described. These compounds were characterized by elemental analysis, mass spectrometry, IR, and multinuclear NMR spectroscopy. The structures of 5a and 5b were also determined by single-crystal X-ray analysis. The trinuclear tin system is formed by bridges through the carboxylate moieties. The metal centers are seven-coordinate and the coordination polyhedron of tin can be depicted as distorted pentagonal-bipyramidal (PBP), where the equatorial plane consists of three oxygens and two nitrogens and the organic groups occupy the axial positions. The work presented here combines the useful properties of Schiff bases and H₃BTC ligands in the formation of organotin(IV) complexes, and investigates the likely antioxidant (DPPH and TBARS) and anti-inflammatory activity (TPA) of the new substances.     

[(Me3SiCH2)2Sn(OCOC6H4NO2-p)OSn(OH)(Me3SiCH2)2]2的合成和晶体结构

在用含微量水的苯和氯仿混合溶剂重结晶（Me3SiCH2）2Sn（OCOC6H4NO2-p）2的过程中,得到含硅二烃基锡化合物[（Me3SiCH2）2Sn（OCOC6H4NO2-p）OSn（OH）（Me3SiCH2）2]2的晶体,通过红外光谱和元素分析对其结构进行了表征。X一射线单晶衍射测定表明,该化合物分子是以Sn2O2四元环为中心的中心对称二聚体结构,内环锡为5配位的畸变三角双锥结构,外环锡也为5配位的畸变三角双锥结构。     

Insecticidal activity of some penta- and hexa-coordinated heterocyclic β-diketone derivatives of diorganotin(IV) against the stored product pest Rhizopertha (Coleoptera: Bostrichidae)

Some new penta-and hexa-coordinated diorganotin complexes of heterocyclic β-diketones having the general formula (n-C₄H₉)₂Sn(OPr¹)_2?n[RCOC:CON(C₆H₅) N:CCH₃]_n (where R?? CH₃, ? C₆H₅ and p-Cl? C₆H₄ and n = 1 and 2) have been synthesized and were screened for their insecticidal activity against Rhizopertha dominica (Fabricius), the lesser grain borer. The hexa-coordinated complexes have been observed to be more active than the penta-coordinated complexes.     

Synthesis and Characterization of Diorganotin Compounds {[R2Sn（ON =CHC6H5）]2O}2 and Crystal Structure of {[（C6H5CH2）2Sn（ON=CHC6H5）]2O}2

Introduction Dimeric tetraorganodistannoxanes are a kind of in-teresting organotin oxo clusters and have attracted con-siderable attention during the last several decades, in view of their unique structural features1-5 as well as their applications as biocides6,7 and in homogenous cataly-sis.8,9 In the solid state, they contain characteristic Sn4O2X2Y2 structural motifts with staircase or ladder arrangements, a planar four-membered Sn2O2 ring and, generally, penta-coordination around the tin…