Optosensing properties of fac-Re(CO)3(dpknph)Cl (dpknph=di-2-pyridyl ketone p-nitrophenyl hydrazone) toward chemotactic N-formylamino acids

Synthesis and characterization of a cadmium-dichloro compound of N , N , O -di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone (η 3-dpktch). The structure of [CdCl2(η 3-dpktch)]

“…We have been interested in the chemistry of di-2-pyridyl ketone (dpk) and its oxime and hydrazone derivatives (see scheme 1), and reported on the synthesis, characterization and structures of a variety of di-2-pyridyl ketone derivatives and their rhenium, manganese and ruthenium compounds [13][14][15][16][17][18][19][20][21][22][23][24]. Electrochemical measurements on fac-[Re(CO) 3 (L-L)Cl] where L-L ¼ dpk or dpkoxime revealed sequential electron transfers that led to plausible mechanisms for the electrochemical reactions of CO 2 , and methylchloroformate (ClCO 2 Me) with fac-[Re(CO) 3 (dpk)Cl] and to the electrochemical reduction and oxidation of free and coordinated dpkoxime in fac-[Re(CO) 3 (dpkoxime)Cl] [13][14][15].…”

“…Electrochemical measurements on fac-[Re(CO) 3 (L-L)Cl] where L-L ¼ dpk or dpkoxime revealed sequential electron transfers that led to plausible mechanisms for the electrochemical reactions of CO 2 , and methylchloroformate (ClCO 2 Me) with fac-[Re(CO) 3 (dpk)Cl] and to the electrochemical reduction and oxidation of free and coordinated dpkoxime in fac-[Re(CO) 3 (dpkoxime)Cl] [13][14][15]. Optosensing measurements on dpkhydrazones and their metal compounds exposed the existence of two interlocked intra-ligand-charge-transfer (ILCT) transitions of the donor-acceptor type that are sensitive to slight changes in their environment and allowed for the possible use of these systems as spectrophotometric sensors for a variety of substrates [16][17][18][19][20][21][22][23][24]. Group 12 metal ions in the concentration range 10 À4 -10 À9 M can be detected and determined using dpkhydrazones and their metal compounds [17,20].…”

Synthesis and structure of the first molybdenum compound of N,O,N-hydroxybis(2-pyridyl)methanolato (η 3-dpkO, OH). The structure of [Mo(O)2(μ-O)(η 3-dpkO,OH)]2 · 2dmso

“…All non-hydrogen atoms were refined with anisotropic thermal parameters. (2) 1294 (4) 153 (3) 3424 (2) 35(1) C (11) 3167 (5) 1266 (4) 5642 (3) 50(1) C (12) 4700 (5) 1354 (4) 5833 (3) 63(1) C (13) 5631 (5) 1647 (4) 5210 (3) 62(1) C (14) 5016 (5) 1848 (4) 4415 (3) 49(1) C (15) 3468 (4) 1768 (3) 4275 (3) 39 (1) The appearance of broad O-H stretching vibration at 3425 cm À1 signifies intensive intermolecular hydrogen bonding in the solid state as the free hydroxyl stretching band appears sharp between 3700-3580 cm À1 [22]. The 1 H-NMR spectra measured in d 6 -dmso confirmed the symmetrical coordination of 3 -dpkO,OH as evident by the appearance of four peaks with the same intensity.…”

“…Electrochemical experiments on fac-[Re(CO) 3 (dpk.oxime)Cl] showed the coordinated oxime moiety to act as an electron sink/source and that its first reduction in non-aqueous media is solvent dependent, controlled by the proton accepting ability of the solvent [10]. Optical measurements on dpknph and fac-[Re(CO) 3 (dpknph)Cl] and other related compounds revealed the existence of two charge-transfer bands for the free ligand and its metal compound; that the electronic/charge transfer in fac-[Re(CO) 3 (dpknph)Cl] is faster than in the case of free dpknph; and demonstrated the applicability of fac-[Re(CO) 3 (dpknph)Cl] as a spectrophotometric sensor for metal ions and biomolecules [11][12][13]. These results prompted us to explore how slight variations in the metal center and ligand backbone may affect the physico-chemical properties of metal compounds of di-2-pyridyl ketone and its oxime and hydrazone derivatives.…”

“…We have been interested in the chemistry of di-2-pyridyl ketone (dpk) and its oxime and hydrazone derivatives (see scheme 1), and reported on the synthesis, characterization and structures of a series of low-valent metal compounds of di-2-pyridyl ketone derivatives, and their applications as molecular sensors for metal ions and biomolecules that include monosaccharide [8][9][10][11][12][13][14][15][16][17][18][19]. The electrochemical reactions of fac-[Re(CO) 3 3 (dpk)Cl] as an electrochemical sensor for electrophiles [8,9].…”