236745-46-3Relevant academic research and scientific papers
Silicagel support mediated nonphotolytic cleavage of the rhenium-rhenium bond of [{NC5H4N=NC6H4(R)}(CO) 3Re0]2. Synthesis of the monomeric species ReI{NC5H4N=NC6H4(R)} (CO)3Cl, crystal structure, spectroscopic and electron-transfer propertys
Samanta,Munshi,Santra,Lokanath,Sridhar,Prasad,Lahiri
, p. 311 - 320 (2007/10/03)
The reaction of Re2(CO)10 with the 2-arylazopyridine ligand, L [L=NC5H4-N=N-C6H4(R), R=H, o-Me/Cl, m-Me/Cl] in dry THF under a dinitrogen atmosphere afforded a metal-metal bonded product of the type (L)(CO)3Re0-Re0 (CO)3(L) 1. On a silica gel column and in the presence of chlorinated solvents (CHCl3 or CH2Cl2) the complex 1 transformed into a mononuclear complex of composition ReI(L)(CO)3Cl 2, where the cleavage of Re-Re bond of 1 and the oxidative addition of chlorine to the rhenium center have taken place consecutively. The molecular structure of the complex 2a (R=H) has been determined by single crystal X-ray diffraction. The crystal lattice consists of two crystallographically independent Re(L1)(CO)3Cl molecules which are non-superimposable mirror images; d and 1 enantiomers, exist in a 1:1 ratio. The complexes 2 display irreversible ReI→ReII oxidation processes near 1.5 V versus SCE and two quasi-reversible azo (N=N) reductions in the ranges -0.28 to -0.48 V and - 0.83 to -1.06 V versus SCE. The complexes of the type 1 exhibit only four successive azo reductions in the range O to -2 V versus SCE. Both the complexes (1 and 2) display dπ(Re) → π*L metal-to-ligand charge-transfer transitions near 500 nm and intraligand n-π* and π-π* transitions near 400 and 300 nm, respectively. The complexes 2 are susceptible to a spontaneous chloride exchange reaction.
