Abstract
Two acetylinic mixed- valent rhodium(II, III) complexes: [cis-{Rh2(II,III)Cl(bpy)2(u-C=C-)}]2, (A) and cis-[Rh(II,III)Cl(bpy)2]-C=C-SiMe3, (B) (where bpy=bipyridine) have been prepared. (A) was accomplished through two pathways. The two complexes were characterized by 1H, 13C NMR, elemental, magnetic, electrochemical analyses and mass spectrophotometry. Cyclic voltametric analyses of the products from 0.00 -1.20 V display two one–electron quasi-reversible oxidation peaks which were attributed to the Rh(II), Rh(III) couple. The redox processes were separated by 528 mV, indicating a significant electronic communication between the two metallic centres. The yields of (A) and (B) were found to be 37 and 32 % respectively.
Highlights
Infrared spectra were recorded on a Beckman IR 4250 spectrophotometer
Electrochemical measurements were performed on an EG&G Princeton Applied Research (PAR) M273A electrochemical analyzer interfaced to an IBM computer employing PAR 270 electrochemical software
The yields, elemental analyses, molar conductivities and other parameters of the complexes are shown in Table 1.The proposed synthetic route of A is shown in equations (1-4)
Summary
Infrared spectra were recorded on a Beckman IR 4250 spectrophotometer. Samples were prepared as pressed pellets of KBr. 1H and 13C spectra were obtained on a Bruker Model AC300/P spectrophotometer operating at 300 and 75.45 MHz, respectively, using tetramethylsilane as internal standard. We report the synthesis and characterization of complexes containing a bridging acetylinic ligand, ISSN 1916-9698 E-ISSN 1916-9701 www.ccsenet.org/ijc synthesized from the reactions of cis-[RhCl2(bpy)2]·2H2O with 1,4-bis(trimethylsilyl)-1,3-butadiyne or bis(trimethyl-silyl)acetylene and [RhCl2(bpy)2]·2H2O with bis(trimethylsilyl)acetylene.
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