Synthesis, structure and properties of new unsymmetrical nickel dithiolene complexes useful as near-infrared dyes

“…1 B 1g and ! 1 B 2g and a charge transfer transition similar to that reported for Ni(II) acetylacetone bis-acylhydrazone (Narang and Singh 1993) and many other Ni(II) complexes with a square planar geometry (Bigoli et al 2000). Nickel(II) complexes generally show three bands in octahedral environment corresponding to the transitions 3 ton et al 2003).…”

Section: Resultsmentioning

confidence: 62%

Synthesis, characterization of some transition metal(II) complexes of acetone p-amino acetophenone salicyloyl hydrazone and their anti microbial activity

2008

View full text Add to dashboard Cite

Complexes of the type [M(apash)Cl] and [M(Hapash)(H2O)SO4], where M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II); Hapash = acetone p-amino acetophenone salicyloyl hydrazone have been synthesized and characterized by elemental analyses, molar conductance, magnetic moments, electronic, ESR and IR spectra, thermal studies (TGA & DTA) and X-ray diffraction studies. The ligand coordinates through two >C=N and a deprotonated enolate group in all the chloro complexes, whereas through two >C=N- and a >C=O group in all the sulfato complexes. The electronic spectra suggest a square planar geometry for Co(II), Ni(II) and Cu(II) chloride complexes and an octahedral geometry for the sulfate complexes. ESR data show an isotropic symmetry for [Cu(apash)Cl] and [Cu(Hapash)(H2O)SO4] in solid state. However, ESR spectra of both Cu(II) complexes indicate the presence of unpaired electron in d x2-y2. The X-ray diffraction parameters for [Co(apash)Cl] and [Cu(Hapash)(H2O)SO4] complexes correspond to a tetragonal and an orthorhombic crystal lattices, respectively. Thermal studies of [Co(apash)Cl] complex shows a multi-step decomposition pattern. Most of the complexes show better antifungal activity than the standard miconazole against a number of pathogenic fungi. The antibacterial activity of these complexes has been evaluated against E. coli and Clostridium sp. which shows a moderate activity.

show abstract

“…By analogy with the electrochemical behaviour reported for many dithiolene complexes these can be assigned to the sequential interchange between the neutral, anionic and dianionic states of the nickel dithiolene complex. 13,[24][25][26][27][28] The separation of the two redox potentials is comparable to 29 [Ni(S 2 C 2 H 2 ) 2 ] x2 and analogous systems where the metal-bis-1,2-dithiolene core is extended with -SR groups. 30 It is however significantly larger than in [Ni(dmit) 2 ] x2 which indicates a poorer ability of 3 to delocalise the added charges.…”

Section: Resultsmentioning

confidence: 99%

Nickel dithiolenes containing pendant thiophene units: precursors to dithiolene–polythiophene hybrid materials

et al. 2008

View full text Add to dashboard Cite

Synthesis, structure and properties of new unsymmetrical nickel dithiolene complexes useful as near-infrared dyes

Cited by 45 publications

References 9 publications

Electrochemical properties and electronic structures of two neutral nickel bis(1,2-dithiolene) complexes

Electrochemical properties and electronic structures of two neutral nickel bis(1,2-dithiolene) complexes

Synthesis, characterization of some transition metal(II) complexes of acetone p-amino acetophenone salicyloyl hydrazone and their anti microbial activity

Nickel dithiolenes containing pendant thiophene units: precursors to dithiolene–polythiophene hybrid materials

Contact Info

Product

Resources

About