736140-06-0Relevant academic research and scientific papers
Rhenium(IV) and rhenium(V) complexes with 3,5-dimethylpyrazole
Sokolov,Fedorova,Pervukhina,Peresypkina,Virovets,Paetow,Fedorov,Fenske
, p. 53 - 61 (2006)
Mono- and dinuclear ReIV and ReV complexes with 3,5-dimethylpyrazole (Me2pzH) were synthesized. The cis-[Re 2O3Cl4(3,5-Me2pzH)4] complex (cis-1) was prepared by the reaction of NH4ReO4 with K[HB(Me2pz)3] in concentrated HCl or by refluxing of [ReCl3(MeCN)(PPh3)2] with Me2pzH in air. The bromide complex trans-[Re2O3Br 4(3,5-Me2pzH)4] (trans-2) was synthesized by passing dry HBr through a solution of [Re2O3Br 2(μ-3,5-Me2pz)2(3,5-Me2pzH) 2] (4) in chloroform. The pyrazolate-bridged complex [Re 2O3Cl2(μ-3,5-Me2pz) 2(3,5-Me2pzH)2] (3) was prepared from (Et 4N)2[ReOCl5] or Cs2[ReOCl 5] and Me2pzH. The corresponding bromide and iodide complexes [Re2O3X2(3,5-Me2pz) 2(3,5-Me2pzH)2] ? C6H 6 (X = Br (4) or I (5)) were synthesized by the reactions of (NH 4)2[ReBr6] or K2[ReI6], respectively, with Me2pzH. The [ReO(OMe)(3,5-Me2pzH) 4]Br2 ? ? 3,5-Me2pzH ? 4H 2O complex (6) was obtained as a by-product in the synthesis of complex 4. The reaction of [ReNCl2(PPh3)2] with Me2pzH was accompanied by hydrolytic denitration giving rise to the mixed-ligand complex [Re2O3Cl2(μ-3,5-Me 2pz)2(3,5-Me2pzH)(PPh3)] (7). The reaction of (NH4)2[ReBr6] with a Me 2pzH melt gave the trans-[ReBr4(3,5-Me2pzH) 2] ? ? Me2CO complex (8). The structures of complexes 2 and 4-8 were established by X-ray diffraction. All compounds were characterized by elemental analysis, electronic absorption spectroscopy, 1H NMR and IR spectroscopy, mass spectrometry, and cyclic voltammetry.
X-ray and electronic structure of the [ReCl3(pzH) 2(PPh3)] and [ReCl3(3,5-Me2pzH) 2(PPh3)] complexes
Machura, Barbara,Jaworska,Kruszynski, Rafal
, p. 1819 - 1827 (2008/10/09)
X-ray structures of new [ReCl3(pzH)2(PPh 3)] and [ReCl3(3,5-Me2pzH)2(PPh 3)] complexes (pzH=pyrazole) have been determined, and the geometric parameters of [ReCl3(pzH)
