2-Aryltelluroethanols and their mercury(II), palladium(II) and platinum(II) alkoxides chelated through tellurium—synthesis and spectra
作者:Ajai K. Singh、S. Thomas
DOI:10.1016/s0277-5387(00)86033-7
日期:1991.1
The sodium salt of 2-aryltelluroethanol (1) (aryl = 4-MeOC6H4 or 4-EtOC6H4), which was synthesized by the reaction of HOCH2CH2Cl with ArTe-Na+ (generated in situ by borohydride reduction of the appropriate Ar2Te2), reacts with HgCl2, PdCl2 and K2PtCl4 in 1:1 molar ratio resulting in alkoxides of stoichiometry [MC1(1-H)2]2. The chelation through tellurium has been supported by proton NMR spectra and in the case of mercury(II) complexes, by C-13 NMR spectra also. The presence of nu[M-Cl(bridging)] in the range 200-270 cm-1 supports the dimeric formulation for these alkoxides based on chlorine bridges. The ArTe group does not significantly affect the hydrogen bonding pattern of the ethanol. The CH2 rocking vibrations suggest that 1 exists in the complexes in the gauche conformation.
Synthesis, crystal structures and antioxidant studies of Pd(II) and Ru(II) complexes of 2-(4-methoxyphenyltelluro) ethanol
the ligand L coordinated to M(II) ion as a monodentate telluroether ligand in both 1 and 2. The structure of cis-[PdCl2(L)2] (1) was square planar about Pd in which two molecules of L coordinated to palladium (II) in cis-fashion. Interestingly, two molecules of 1 were held by strong Te⋯Cl and aromatic π⋯π secondary interactions and oriented in staggered conformation with short Pd-Pd [3.1712 (5) Å] distance
加入Pd(II)(1)和Ru(II)(2)2-(4- methoxyphenyltelluro)乙醇(络合物大号),使用Na合成2 [的PdCl 4(]和[孺η 6 - p -cymene)氯2 ] 2作为金属离子源。新的配合物(1和2)的特征在于1 H,13 C 1 H} NMR,FT-IR,UV-可见光谱和元素分析。它们的结构也通过单晶X射线衍射证实。表征数据表明,配体L在1和2中均作为单齿碲醚配体与M(II)离子配位。的结构的顺式- [的PdCl 2(大号)2 ](1)为约钯正方形的平面,其中的两个分子大号配位到钯(II)在顺式-时尚。有趣的是,两个分子1被强烈碲保持⋯ Cl和芳族π ⋯ π次级相互作用,并与短的Pd-PD [3.1712(5)]的距离形成的双核钯簇(烷烃立体化学取向的顺式- [的PdCl 2(L)2 ])2(1)2。复杂的[Ru(η 6 - p -cymene)