Synthesis, Characterization and Structural Studies on the First Rhenium Complex with Di(2-pyridyl) Ketone 2,4-Dinitrophenylhydrazone (dpkdnph),fac-[Re(CO)3(dpkdnph)Cl]

Abstract

When di(2-pyridyl) ketone 2,4-dinitrophenylhydrazone (dpkdnph) was allowed to react with [Re(CO) 5 Cl] in refluxing toluene fac-[Re(CO) 3 (dpkdnph)Cl] was formed in good yield. Spectroscopic measurements on fac-[Re(CO) 3 -(dpkdnph)Cl] revealed strong solvent dependence as manifested by the high sensitivity of its electronic absorption spectra to solvent variation. Electrochemical measurements on fac-[Re(CO) 3 (dpkdnph)Cl] in DMF show electrochemical properties with quasi-reversible reductions following an irreversible one-electron transfer. Structural studies on a brown

Synthesis, and molecular sensing behavior of fac-[Re(CO)3(κ2-N,N-dpksc)Cl], dpksc=di-2-pyridyl ketone semicarbazone

“…This reaction is similar to the reactions reported for the synthesis of a variety of rhenium carbonyl compound of the type fac-[Re(CO) 3 (j 2 -N, N-L-L)Cl] where LAL@N,N-bidentate a-diimine ligand [30][31][32][33].…”

“…The infrared spectra of fac-[Re(CO) 3 (j 2 -dpksc)Cl] disclosed signals consistent with the coordination of [30][31][32][33]. In the m(NH 2 ), two peaks appeared 3527, 3414 cm À1 and in the m(NH) region a single peak appeared 3097 cm À1 .…”

“…The authenticity of fac-[Re(CO) 3 (j 2 -N,N dpksc)Cl] was elucidated from the results of its elemental analysis, spectroscopic properties and a comparison of these results with those reported for similar compounds [30][31][32][33]. The infrared spectra of fac-[Re(CO) 3 (j 2 -dpksc)Cl] disclosed signals consistent with the coordination of [30][31][32][33].…”

“…In continuation of our efforts to explore the chemistry of di-2-pyridyl ketone derivatives, this report will describe the synthesis and physico-chemical properties of the first rhenium compound di-2-pyridyl ketone semicarbazone (see Scheme 1). In previous reports, we described the synthesis, spectroscopic, electrochemical, and solid state structures of a variety of metal compounds that contain di-2-pyridyl ketone derivatives [30][31][32][33][34][35][36][37]. Electrochemical reactions of CO 2 with fac-[Re(CO) 3 (dpk)Cl] measured on non-aqueous solvents showed strong solvent dependence and revealed metal-based and ligandbased reactivity [30].…”

“…Electrochemical reactions of CO 2 with fac-[Re(CO) 3 (dpk)Cl] measured on non-aqueous solvents showed strong solvent dependence and revealed metal-based and ligandbased reactivity [30]. Spectroscopic measurements done on nonaqueous solutions of di-2-pyridyl ketone hydrazones and their metal complexes show high sensitivity of these compounds to changes in their surroundings [32][33][34][35][36][37]. Solid state structures of a variety of di-2-pyridyl ketone derivatives and their metal compounds show strong solvent dependence due to solvent complex interaction and the presence of extensive network of hydrogen bond [33][34][35][36][37].…”