Magnetic and spectral studies on nickel(II) and copper(II) dithiocarbazates derived from isoniazid

Abstract

Some isonicotinoyldithiocarbazate complexes of nickel(II) and copper(II), of general formulae M(IN-Dtcz) 2 , [M(IN-DtczH) 2 ]Cl 2 , and [M(IN-DtczH-Sal) 2 ]Cl 2 (M ¼ Ni(II), Cu(II); INDtcz ¼ isonicotinoyldithiocarbazate; IN-DtczH ¼ isonicotinoyldithiocarbazic acid; IN-DtczH-Sal ¼ salicylaldehyde Schiff base of isonicotinoyldithiocarbazic acid), have been synthesized. These complexes have been investigated by elemental analyses, mass, room temperature infrared and electronic spectra, and variable temperature magnetic susceptibility measurements. The three nickel(II) dithiocarbazates and [Cu(IN-DtczH-Sal) 2 ]Cl 2 exhibit NS linkage of the ligands, while Cu(IN-Dtcz) 2 and [Cu(IN-DtczH) 2 ]Cl 2 have ONS binding of the ligands. The nickel(II) dithiocarbazates have [NiN 2 S 2 ] chromophore. Magnetic and solution electronic absorption spectral data reveal square-planar geometry for Ni(IN-Dtcz) 2 and the existence of square-planar-tetrahedral equilibrium for [Ni(IN-DtczH) 2 ]Cl 2 and [Ni(IN-DtczHSal) 2 ]Cl 2 . Copper(II) dithiocarbazates, namely Cu(IN-Dtcz) 2 , [Cu(IN-DtczH) 2 ]Cl 2 , with ONS ligands having dimeric or polymeric octahedral structures, and [Cu(IN-DtczH-Sal) 2 ]Cl 2 , with NS binding having dimeric square-planar structure, exhibit antiferromagnetism. Superexchange pathway involving the bridging nitrogen and sulfur of the isonicotinoyldithiocarbazate ligands rather than direct metal-metal exchange is suggested for antiferromagnetic interactions. The spin exchange parameter, À2J ¼ 202.14 and 29.26 cm À1 , has been evaluated for [Cu(IN-DtczH) 2 ]Cl 2 and [Cu(IN-DtczH-Sal) 2 ]Cl 2 , respectively, while it could not be evaluated for Cu(IN-Dtcz) 2 because the slope was negative due to the non-variation of its magnetic moment with temperature. The difference in antiferromagnetic behavior and inconsistency of 2J for [Cu(IN-DtczH-Sal) 2 ]Cl 2 has been attributed to different electronic and steric factors of the three ligands, that is, isonicotinoyldithiocarbazate, its acid, and salicylaldehyde Schiff-base derivative.

Synthesis, Characterization, Thermal and Antibacterial Study of a Novel Sulfonamide Derivative, W-[(E)-Pyridin-3-Ylmethylidene]benzenesulfonamide, and Its Co(ii), Cu(ii) and Zn(ii) Complexes

“…[Co(PMBS)Cl 2 ] exhibited well resolved peak at 16638 cm -1 (601 nm) and assigned to 4 A 2 → 4 T 1 (F) and at 14925 cm -1 (670 nm) is assigned to 4 A 2 → 4 T 1 (P) 14 .These values supports the tetrahedral geometry for Co(II) complex. In [Cu(PMBS)Cl 2 ]the peak is at 16077 cm -1 (622 nm) Fig.3 and is assigned to the transition 2 B 2 → 2 A 1 .…”

Zr(IV), La(III), and Ce(IV) Chelates with 2-[(4-[(Z)-1-(2-Hydroxyphenyl)ethylidene]aminobutyl)-ethanimidoyl]phenol: Synthesis, Spectroscopic Characterization, and Antimicrobial Studies

“…Zr(IV), La(III), and Ce(IV) chelates were recorded in DMSO solvent and shown in Table 2 and Figures 7-10. In the spectrum of the Schiff base it exhibits two bands at 269 nm (37175 cm −1 ) and 329 nm (30395 cm −1 ) assigned to → * and → * transitions [20]. In the metal chelates, the octahedral chelates that contain a metal ion of d 0 electronic configuration are diamagnetic.…”

Synthesis ,Characterisation And Anti Cancerus Studies of Schiff Base Complexes of Co(II),Cu(II) And Ni(II) Using DFMPM And L-Histidine

“…Another absorption bands at 986 cm -1 to 875 cm -1 is assigned to M-N bond and 758 cm -1 to 750cm -1 is assigned to M-O bond [18][19] . …”

“…It was found that the interaction of Ni(II) is normally more intense than other divalent metal ion with Schiff base ligand [28] . Nature of the ligand and the chelate effect were the factors involved in the environmental chemistry and technological interest [29] .…”