Nickel(II) complexes of the unsymmetrical tetradentate Schiff base of methyl-2-(N-2′-aminoethane), (1-methyl-2′-aminoethane), (3-aminopropylamino)cyclopentenedithiocarboxylate: Synthesis, characterization, thermodynamic and computational studies

Synthesis, physical characterization, antibacterial activity and thermodynamic studies of five coodrdinate cobalt(III) Schiff base complexes

“…The sharp intensity bands around 1200 cm -1 region are assigned to ν(C-O) band stretching vibration [29]. The band due to the ν(C-S) + ν(C-N) vibration mode in complexes have the maximum in the region 1111-1180 cm -1 [19]. The FT-IR spectrum of the complexes exhibits a strong band of the perchlorate stretching vibrations, which are typical of non-coordinating perchlorate [30].…”

“…In order to mimic such living systems and to shed some light on binding modes and to continue our investigation in the field of Schiff base complexes with NNOS coordination sphere [19][20][21][22][23], we report here the synthesis, characterization and spectral studies of the new complexes [Co(Chel)(PBu 3 )]ClO 4 .H 2 O where Chel = cd3OMesalMeen, cd4OMesalMeen, cd5OMesalMeen: Methyl-2-{[1-methyl-2-(2-hydroxy-3-, 4-, 5-methoxy-phenyl) methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate. The solid products are well characterized by elemental analyses, UV-Vis, NMR spectra, along with the assignment of their infrared spectra for most of the fundamental vibrations.…”

Synthesis, Characterization, Spectral Studies, Antibacterial Evaluation, Thermodynamics and DFT Calculations of Dimethyltin(IV) Dichloride Schiff Base

“…These bands shift to lower frequencies and overlap with ν(C-H) in the range 2800-3000 cm -1 . 26 In the IR spectra of tin(IV) complexes, a new band is appeared above 3000 cm -1 attributed to the stretching vibration of NH in diketons moiety. This is due to the coordination of oxygen atom with tin center, which weakens the hydrogen bonding and so causing more transferring of proton to nitrogen.…”

“…29 This is further supported by unchanged ν(C-S) band at 700-750 cm -1 in the ligands and their complexes. 5,26,35 All ligands show a moderately strong, sharp peak due to C=N stretching vibration in the region 1606-1640 cm -1 . [36][37][38] After the complexation reactions, the imine C=N bands are not shifted at all, indicating that the imine nitrogen atoms are not coordinated to the tin(IV) center.…”

“…The competition between chelating and bridging coordination mode is an important factor in producing mono, di and polynuclear metal complexes. In view of the importance of tin compounds in medicinal chemistry and as a part of our ongoing work on metal Schiff base complexes, [24][25][26][27] herein, we describe synthesis and characterization of some tin(IV) Schiff base complexes with general formula . This work is also extended to present some well-known properties of the complexes, such as plausible descriptions of stability constants, HOMO-LUMO orbital energies and dipole moments as ascribed on the basis of DFT calculations.…”