钛锆钒异核双金属配合物[Cp_2V(μ-η~2:η~4-PhC_4Ph)MCp_2′](M=Ti,Zr;Cp′=C_5H_5,C_5H_4SiMe_3)的合成与表征

室温下 ,[Cp2 Ti(C≡ CPh) 2 ],[Cp2 Zr(C≡ CPh) 2 ]和 [(C5H4 Si Me3) 2 Zr(C≡ CPh) 2 ]分别与二茂钒作用 ,合成了 [Cp2 V(μ-η2∶ η4 -Ph C4 Ph) MCp2 ′](1 ,M=Ti,Cp′=C5H5;2 ,M=Zr,Cp′=C5H5;3 ,M=Zr,Cp′=C5H4 Si Me3) .用元素分析、质谱、核磁共振谱、磁矩、红外和拉曼光谱对配合物进行了表征 . 3个配合物具有相似的磁化率 ,配合物 3的晶体结构分析表明 Ph C4 Ph通过内部 2个碳原子键合到 Cp2 V上 ,内部 2个碳原子和外部 2个碳原子均与 Cp2 ′Zr键合 ,丁二烯骨架内部的

Synthesis and Characterization of the Thermoelectric Nickel Tetrathiooxalate Polymer as Nanoparticles

Nanoparticles of the conductive coordination polymer Ni(tto) have been synthesized under mild conditions in the presence of bio-based polyesters or polyethylene glycol acting as growth controlling agents. With polyesters, aggregates of particles are observed whereas well dispersed nanoparticles are obtained with polyethylene glycol. Indeed, for a Ni2+/polyethylene glycol weight ratio of 0.031, transmission electron micrographs evidence dispersed particles exhibiting sizes in the 3 - 10 nm range. Infrared spectra for nanopowders show two CS stretching modes in the 1100 - 1190 cm−1 range, confirming the presence of the tetrathiooxalate ligand coordinated to the nickel center. The room-temperature electrical conductivity for the nanopowder prepared in the presence of polyethylene glycol is about 0.8 S∙cm−1, a decent value for tetrathiolate-based polymers. Finally, magnetic susceptibility measurements for well-dispersed Ni(tto) particles evidence a Curie-Weiss law in a large temperature range. Moreover, low temperatures measurement would confirm intra- or interchain interactions between nickel atoms within the Ni(tto) polymer chains.