49651-12-9Relevant academic research and scientific papers
Spin Changes Accompany Ultrafast Structural Interconversion in the Ground State of a Cobalt Nitrosyl Complex
Marroux, Hugo J. B.,Curchod, Basile F. E.,Faradji, Charly A.,Shuttleworth, Timothy A.,Sparkes, Hazel A.,Pringle, Paul G.,Orr-Ewing, Andrew J.
, p. 13713 - 13716 (2017)
Ultrafast, reversible intersystem crossing (ISC) is reported under ambient conditions for the electronic ground state of the pentacoordinate cobalt nitrosyl complexes, [CoX2(NO)(PMePh2)2] (X=Cl, Br), in solution. ISCs on such short timescales are more typically observed in electronically excited states reached by absorption of ultraviolet or visible light. Singlet and triplet electron spin states of the complex, corresponding to two different isomers, are populated at room temperature, and the two isomers exchange on a timescale of a few picoseconds. Ultrafast two-dimensional infrared spectroscopy observes the change in wavenumber of the NO ligand band accompanying the isomerization and associated ISC on the (spin) adiabatic ground potential energy surface. Comparison of the dynamics of the chloro- and bromo-complexes shows that inertial effects of the ligand motion have a greater effect than spin–orbit coupling on determining the forward and reverse isomerization and ISC rates.
Solvent effect on cis-1,4-specific polymerization of 1,3-butadiene with CoCl2(PRPh2)2-EASC catalytic systems
Zhou, Qinzhuo,Li, Bo-Geng,Jie, Suyun,Zheng, Na
, p. 773 - 779 (2014/03/21)
A series of phosphine-containing cobalt complexes [CoCl 2(PRPh2)2, R = Ph (1), Cy (2), nPr (3), Et (4), Me (5), H (6)] has been used for the highly active and stereospecific polymerization of 1,3-butadiene upon activation with ethylaluminum sesquichloride (EASC). The high catalytic activities and polybutadienes with high cis-1,4 selectivity were obtained in the solution polymerization in toluene. The conversion of butadiene and the microstructure and molecular weight of the resulting polymers were affected by reaction parameters and the R group on the phosphine ligand. The dispersion medium was also a sensitive factor for the current catalytic systems, influencing the catalytic activity and properties of products. In comparison with the solution polymerization in toluene, the heterogeneous polymerization in isooctane yielded slightly lower catalytic activity, cis-1,4 content and molecular weight under similar reaction conditions.
Synthesis, structure and butadiene polymerization behavior of CoCl 2(PRxPh3 - X)2 (R = methyl, ethyl, propyl, allyl, isopropyl, cyclohexyl; X = 1, 2). Influence of the phosphorous ligand on polymerization stereo
Ricci, Giovanni,Forni, Alessandra,Boglia, Aldo,Sommazzi, Anna,Masi, Francesco
, p. 1845 - 1854 (2007/10/03)
Several cobalt(II) phosphine complexes have been synthesized by reacting cobalt(II) chloride with various mono- and diphenylalkylphosphines (PR xPh3 - x; R = methyl, ethyl, allyl, propyl, isopropyl, cyclohexyl; x = 1, 2). For some of
