2999-48-6Relevant academic research and scientific papers
Synthesis, characterization and mechanochromic behavior of binuclear gold (I) complexes with various diisocyano bridges
Liang, Jinhua,Hu, Fang,Lv, Xiaoyi,Chen, Zhao,Chen, Zhiming,Yin, Jun,Yu, Guang-Ao,Liu, Sheng Hua
, p. 485 - 490 (2012)
A series of binuclear gold (I) complexes were synthesized. Their structures were characterized by elemental analyses, IR spectrometry, UV-Vis spectroscopy and single crystal X-ray diffraction. Their fluorescent mechanochromic (tribochromic) properties were investigated. The results of the mechanochromic studies suggested that the gold complexes with methylsubstituted phenyl bridges exhibited mechanochromism and a 100 nm red-shift of fluorescent spectrum could be observed after grinding. The complex with a diphenylmethane bridge exhibited mechanochromism with a change in fluorescence from green to blue (25 nm red-shift after grinding). The ground complexes reverted to their original states by treatment with CH2Cl2. No mechanochromism was observed for either the biphenyl or diphenylethane containing complexes.
Stepwise formation of quasi-octahedral macrocyclic complexes of rhodium(III) and iridium(III) bearing a pentamethylcyclopentadienyl group
Yamamotoa, Yasuhiro,Suzuki, Hajime,Tajima, Nobuo,Tatsumi, Kazuyuki
, p. 372 - 379 (2007/10/03)
Reactions of [{MCl2(Cp*)}2] (1: M=Ir, 2: M=Rh) with bidentate ligands (L) such as 1,4-diisocyano-2,5-dimethylbenzene (a), 1,4-diisocyano-2,3,5,6-tetramethylbenzene (b), pyrazine (c) or 4,4′-dipyridyl (d) gave the corresponding dinuclear complexes [{MCl2(Cp*)}2(L)] (M=Ir: 3a, 3b, 5c, 5d; M=Rh: 4b, 6c, 6d), which were converted into tetranuclear complexes [{M2 (μ-Cl)2(Cp*)2} 2(L)2](OTf)4 (M=Ir: 7c, 7d, 9a, 9b; M=Rh: 8c, 8d, 10b) on treatment with Ag(OTf). X-ray analyses of 8c and 8d revealed that each of four pentamethylcyclopentadienyl metal moieties was connected by two μ-Cl-bridged atoms and a bidentate ligand to construct a rectangular cavity with the dimensions of 3.7 × 7.0 A for 8c and 3.7 × 11.5 A for 8d. Both the Rh2Cl2 and pyrazine (or 4,4′dipyridyl) ring planes are perpendicular to the Rh4 plane. Treatment of Cl-bridged complexes (7c, 7d, 8c, 8d, 9b, and 10b) with a different ligand (L') resulted in cleavage of the Cl bridges to produce two-dimensional complexes [{MCI(Cp*)}4{(L)-(L')}2](OTf)4 (11ac, 11bc, 11bd, 12bc, and 12bd) with two different ligand edges . Complex 10b reacted readily with 1,4-diisocyano-2,3,5,6-tetramethyl-benzene (b) to give a tetranuclear rhodium(III) complex 12bb. The structure of tetranuclear complexes was confirmed by X-ray analysis of 11bc. Each {(MCp*} moiety is surrounded by a Cl atom, isocyanide, and pyrazine (or 4,4′-dipyridyl) and the dimensions of its cavity are 7.0 × 11.6 A.
