Metal complexes of a new class of polydentate Mannich bases: Synthesis and spectroscopic characterisation

Design and Characterization of New Dinuclear Macrocyclic Dithiocarbamate Complexes by the Preparation of a Free Ligand Derived from Isopropylamine

“…The bands resulting from the stretching vibrations of the N-CS 2 bonds in the range 1459-1475 cm -1 have a wave number which is intermediate between the values observed for C-N single bond (1270-1377 cm -1 ) and C=N double bonds (1619cm -1 ), suggesting a partial delocalization of (π _ electron) density within the dithiocarbamate functions [16]. For the (CS 2 ) groups, the asymmetric vibrations of the CS 2 fragment appeared between 1059 and 1065 cm -1 and the symmetric band ν(CS 2 ) was observed at 999-901cm -1 , assuring the anisobidentate chelation mode of the DTC ligand to the metal atoms [17].…”

“…The Co (II) _ complex displayed bands in the d-d visible region at an average of 564 and 645nm. These bands could be attributed to 4 A 2 (F) → 4 T 1 (F) transitions [17,18]. The magnetic moment value of μeff 4.76 B.M for the green Co (II) complex is in agreement with tetrahedral structures [19].…”

Synthesis, characterization and biological activity of some nickel(II) mixed ligands complexes of dithiocarbamate and 1,10-phenanthroline

“…In metal dithiocarbamato complexes the region 950-1050 cm -1 is considered characteristic of the nature of binding of the dithiocarbamato moiety. The presence of a solitary band in the above region is due to symmetrical bidentate coordination of the dithiocarbamato group while the splitting of this band within a narrow range of 20 cm -1 is due to the unsymmetrical monodentate nature of the dithiocarba-mato group as shown in Scheme 2 [25]. In the present study, a single sharp band of high intensity has been observed in the two complexes in 946-1111 cm -1 range, indicating symmetrical bidentate binding of the dithiocarbamato moiety.…”

“…Band I corresponding to π-π* transitions of the N-C=S system [24]. Band II is attributed to π-π* transitions of S-C=S group [25]. Band III with low intensity is assigned to an n-π* transitions, i.e.…”

Synthesis, Characterization and Antimicrobial Screening of Metal Complexes of Mannich Bases Derived from Benzimidazole

“…The band appears at 325 cm -1 in all the complexes assigned to M-Cl stretching vibration. The ν(C=O) amide vibration at 1690 cm -1 in the free ligand BIBS is shifted and observed around 1675 cm -1 for Co(II), 1670 cm -1 for Ni(II), Intensity PPM 1680 cm -1 for Cu(II) and 1660 cm -1 for Zn(II) chloro complexes, respectively indicating coordination of the nitrogen of the amide group to the metal atoms 15 . The ν(C=S) stretching 1049 cm -1 in the free ligand BIBTS is shifted to higher frequency and observed around 1052 for Co(II), 1083 for Ni(II), 1059 for Cu(II) and 1055 for Zn(II) chloro complexes, respectively indicating coordination of sulfur atom of the C=S moiety to the metal atoms 16 .…”