Reaction of trans-dichloro(ethylene)pyridineplatinum(<scp>II</scp>) complexes with substituted pyridines and ethylene: mechanism of ligand exchange and attack of free base on the co-ordinated olefin. Preparation of two zwitterionic complexes containing platinum–carbon σ-bonds
Two complexes of formula trans-[Pt(CH2CH2L)CI2L](L = 4-methylpyridine or 3,5-dimethylpyridine) have been prepared by nucleophilic attack of the free amine on the co-ordinated ethylene of trans-[Pt(C2H4)Cl2L]. Such a reaction occurs only with the more basic and less hindered pyridines. The free pyridines also exhibit nucleophilic attack on the metal centre leading to a pyridine-exchange reaction. The
Multinuclear NMR study and crystal structures of complexes of the types cis- and trans-Pt(Ypy)2X2, where Ypy=pyridine derivative and X=Cl and I
作者:Christian Tessier、Fernande D. Rochon
DOI:10.1016/s0020-1693(99)00303-5
日期:1999.11
and the pyridine ligands do not seem very important. The crystal structures of three dichloro and five diiodo complexes were determined, in an attempt to obtain information on the trans influence of the three ligands. The results have shown that the iodo ligand has the greatest trans influence. Chloro and pyridine ligands seem to have similar trans influence, although, the chloro ligand seems to have
摘要用光谱方法研究了顺式和反式Pt(Ypy)2X2型配合物,其中Ypy是吡啶的甲基衍生物,X = Cl或I。在195Pt MNR中,在CDCl3中的-1998至-2021 ppm之间观察到顺式二氯化合物,而在-1948至-1973 ppm之间的场中则发现反式化合物。在更高的视野下观察到二碘化合物,对于顺式异构体为-3199至-3288 ppm,对于反式异构体为-3122至-3264 ppm。在1 H NMR中,顺式化合物的3J(195Pt1H)偶联常数(约42 ppm)大于反式异构体的3J(195Pt1H)偶联常数(约33 ppm)。在13 C NMR中,也发现顺式配合物的3J(195Pt for13C)值更大。质子化配体的pKa值似乎对δ(Pt)化学位移有轻微的依赖性。Pt和吡啶配体之间存在π键似乎并不重要。确定了三个二氯和五个二碘配合物的晶体结构,试图获得有关三个配体的反式影响的信
Synthesis and NMR characterization of the novel mixed-ligand Pt(II) complexes cis- and trans-Pt(Ypy)(pyrimidine)Cl2 and trans,trans-Cl2(Ypy)Pt(μ-pyrimidine)Pt(Ypy)Cl2 (Ypy=pyridine derivative)
作者:Fernande D. Rochon、Majd Fakhfakh
DOI:10.1016/j.ica.2008.07.003
日期:2009.4
signals of the cis monomers were found at slightly higher fields than those of the corresponding trans isomers. The δ ( 195 Pt) of the dimers were found close to those of the trans monomers. The NMR results were interpreted in relation to the solvent effect, which seems important in these complexes. The couplingconstants J ( 195 Pt– 1 H) and J ( 195 Pt– 13 C) are larger in the cis geometry. The crystal
Nucleophilic displacement of the chelating bis(sulfoxide) from cis-[meso-1,2-bis(phenylsulfinyl)ethane]dichloroplatinum(II) and cis-[rac-1,2-bis(phenylsulfinyl)ethane]dichloroplatinum(II)
作者:Lucio Cattalini、Giampaolo Marangoni、Gianni Michelon、Gino Paolucci、Martin L. Tobe
DOI:10.1021/ic50215a017
日期:1981.1
Trans platinum(II) complexes with pyridine and substituted pyridines