640274-44-8Relevant academic research and scientific papers
Optical, electrochemical and structural studies of the first rhenium compound of di-2-pyridylketone benzoylhydrazone (dpkbz) fac-Re(CO) 3(dpkbh)Cl
Bakir, Mohammed,Brown, Ordel
, p. 89 - 98 (2003)
The reaction between Re(CO)5Cl and di-2-pyridylketone benzoylhydrazone (dpkbh) in refluxing toluene gave fac-Re(CO) 3(dpkbh)Cl in good yield. Spectroscopic and electrochemical measurements on fac-Re(CO)3(dpkbh)Cl revealed strong solvent-solute interaction, as manifested by the sensitivity of its reduction potentials and electronic absorption spectra to solvent variations. Spectroscopic and thermo-optical measurements in polar solvents in the presence of NaBH 4 and NaBF4, or NaOH and citric acid reveal reversible interconversion between the low- and high-energy electronic states of fac-Re(CO)3(dpkbh)Cl at 440 and 318 nm. Electrochemical measurements on fac-Re(CO)3(dpkbh)Cl show irreversible redox processes pointing to electrochemical transformations following the first electronic transfer(s). Crystals of fac-Re(CO)3(dpkbh)Cl obtained from an acetonitrile solution of fac-Re(CO)3(dpkbh)Cl are centric and crystals of fac-Re(CO)3(dpkbh)Cl·dmso obtained from a dmso solutions of fac-Re(CO)3(dpkbh)Cl are acentric. Structural studies show non-identical twins of fac-Re(CO)3(dpkbh)Cl and fac-Re(CO) 3(dpkbh)Cl·dmso with distorted octahedral coordination about rhenium and the conformation about the amide group is syn- in fac-Re(CO) 3(dpkbh)Cl and anti- in fac-Re(CO)3(dpkbh)Cl·dmso. The packing of molecules shows a web of hydrogen bonds that may account for the stability of different conformations observed in the solid state.
Coordination of bidentate aroylhydrazone-based N,N-Donor ligands to the fac-[re(co)3]+ core
Mukiza, Janvier,Gerber, Thomas I. A.,Hosten, Eric C.
, p. 368 - 375 (2014/07/21)
The reaction of the potentially bidentate aroylhydrazone-based N,N-donor ligands N-(di(pyridin-2-yl)-methylene)benzohydrazide (Hdpmb) and 3-((pyridin-2-yl)methyleneamino)-2,3-dihydro-2-(pyridin-2-yl)quinazolin-4-(1H) one (Hppq) with [Re(CO)5Cl]
Tricarbonyl rhenium(I) and technetium(I) complexes with hydrazones derived from 4,5-diazafluoren-9-one and 1,10-phenanthroline-5,6-dione
Barbazan, Paula,Hagenbach, Adelheid,Oehlke, Elisabeth,Abram, Ulrich,Carballo, Rosa,Rodriguez-Hermida, Sabina,Vazquez-Lopez, Ezequiel M.
, p. 4622 - 4630 (2011/02/27)
Tricarbonylrhenium(I) and -technetium(I) halide (halide = Cl and Br) complexes of ligands derived from 4,5-diazafluoren-9-one (df) and 1,10-phenanthroline-5,6-dione (phen) derivatives of benzoic and 2-hydroxybenzoic acid hydrazides have been prepared. The
X-ray crystallographic, spectroscopic and molecular sensing properties of fac-tricarbonylchloro(di-2-pyridylketonebenzoylhydrazone)rhenium(I) dimethylformamide solvate
Bakir, Mohammed,Brown, Ordel,Johnson, Toni
, p. 265 - 272 (2007/10/03)
The molecular sensor fac-[Re(CO)3(dpkbh)Cl]·DMF (1) where DMF=N,N-dimethyl formamide and dpkbh=di-2-pyridylketonebenzoylhydrazone crystallized in the acentric triclinic space group P1. Structural analysis shows two units of (1) with rhenium in distorted octahedral geometry, the carbonyl groups are in facial positions with an average C-Re-C angle of 90° and the N,N-bidentate dpkbh forms six-membered metallocyclic ring with rhenium in a boat conformation. The molecular packing shows the binding of DMF to fac-[Re(CO)3(dpkbh)Cl] and helical strands of (1) interlocked via a network of hydrogen bonds. Optical measurements on fac-[Re(CO) 3(dpkbh)Cl] in DMF show the presence of two interlocked charge transfer bands at 440 and 318 nm that are highly sensitive to slight variations in their surroundings. As the concentration decreases, the intensity of the low energy absorption band at 440 nm increases and the reverse is observed when the concentration increases. Thermo-optical measurements on fac-[Re(CO) 3(dpkbh)Cl] in DMF established the reversible interconversion between the high and low energy electronic states of fac-Re(CO) 3(dpkbh)Cl and changes in enthalpy (ΔH?) of+17.44±0.40kJmol-1, entropy (ΔS?) of +37.45±0.50 J mol-1 and free energy (ΔG ?) of +6.27±0.30 kJ mol-1 in DMF were calculated. Acids or bases in concentration as low as 1.0×10 -9M can be detected and determined using fac-[Re(CO) 3(dpkbh)Cl] in DMF. 1H-NMR measurements on fac-[Re(CO)3(dpkbh)Cl] in DMF in non-aqueous media reveal high sensitivity to solvent and temperature variations and points to strong solvent-complex interactions. The amide protons and solvate protons show high sensitivity to temperature variations than the aromatic protons pointing to the participation of the amide proton in solvate-complex hydrogen bonds in non-aqueous solutions of fac-[Re(CO)3(dpkbh)Cl].
