Molecular sensing behavior of di-2-pyridylketone-2-thenoylhydrazone (dpktah) in non-aqueous media

Synthesis, spectroscopy, thermodynamics and structure of [ZnCl2 (η3-dpktch)] (η3-dpktch = N,N,O- di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone)

“…The compound dpktch was prepared following a standard procedure employed for the synthesis of dpkhydrazones [14]. All other reagents were obtained from commercial sources and used without further purification.…”

“…The IR spectrum of [ZnCl 2 ( 3 -dpktch)] shows a band at 1610 cm À1 due to the amide I(C¼O) vibration. The amide I C¼O vibration appeared at 1603 and 1655 in [CdCl 2 ( 3 -dpktch)] and dpktch, respectively [14,15]. The(C¼O) peak for [ZnCl 2 ( 3 -dpktch)] appeared at higher wavenumbers compared to [CdCl 2 ( 3 -dpktch)] suggesting weaker binding of ZnCl 2 than CdCl 2 to dpktch.…”

“…We reported on the synthesis, characterization, structures and optosensing behavior of a variety of di-2-pyridyl ketone derivatives and in recent reports described the optosensing behavior of di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone (dpktch) [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Optical measurements on dpktch in non-aqueous solvents show facile inter-conversion between two molecular conformations that are sensitive to changes in their surroundings [14]. Optosensing measurements show that group-12 metal dichlorides in concentrations as low as 1 Â 10 À5 M can be detected and determined using dpktch in non-aqueous media.…”