Thiobarbiturate and barbiturate salts of pefloxacin drug: Growth, structure, thermal stability and IR-spectra

Abstract

Three new salts of pefloxacin (PefH) with thiobarbituric (H2tba) and barbituric (H2ba) acids, pefloxacinium 2-thiobarbiturate trihydrate, PefH2(Htba)•3H2O (1), pefloxacinium 2-thiobarbiturate, PefH2(Htba) (2) and bis(pefloxacinium barbiturate) hydrate, (PefH2)2(Hba)2•2.56H2O (3) are synthesized and structurally characterized by the X-ray singlecrystal diffraction. In the structures of 1-

Two new Cu(II) and Ni(II) 1,10-phenanthroline complexes with anions of barbituric acids in the outer sphere: Synthesis, structure, spectroscopic, magnetic and thermal properties

“…One of the two water molecules is disordered over two positions. The Ni 1S) and the angles in barbiturate ions coincide with those found in other complexes containing uncoordinated Htba e ions [26,31,32].…”

“…5S, curve 3), the bands at 3386 and 3550 cm À1 are assigned to the n(OH) vibrations of water molecules and a broad band centered at 3167 cm À1 is assigned to the n(NH) stretching vibrations of Htba e ions. The bands with the frequencies 1682 and 1609 cm À1 in the IR spectra 1 and 2 respectively are assigned to the stretching mode of CO in Hba e and Htba e ions [25,26]. Peaks at 431 and 426 cm À1 in the spectra of 1 and 2 respectively are attributed to the M À N stretching vibrations [37].…”

Crystal structures of [Cu2(2,2′-bipyridine-N,N′)2(H2O)2(μ2-OH)2](barbiturate)2·2H2O and [Cu(2,2′-bipyridine-N,N′)(H2O)(barbiturate-O)Cl]·2H2O

“…4S) (Fig. 4S, curve 3 and 4) respectively assigned to the stretching mode of CO in Hba − ion [25,33]. An intense band at 1600 cm −1 in IR spectra of 1-2 is attributed to the ν(CC)/ ν(CN) stretching modes of the pyridil ring [34].…”

Two novel mixed-ligand Ni(II) and Co(II) complexes with 1,10-phenanthroline: Synthesis, structural characterization, and thermal stability

“…3S−4S) and this indicates the formation of new compounds. In the analysis of the IR spectra, the results of earlier studies were used for comparison [18,21,22,23]. In the IR spectrum of compound 1 (Fig.…”