Spectral and ESR features of some copper(II) chelates with 2-hydroxyaryloximes

Lalia‐Kantouri, Maria; Hartophylles, M.

doi:10.1016/s0277-5387(00)86011-8

Cited by 15 publications

(9 citation statements)

References 29 publications

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“…Such information is relevant since hydroxyoximes are ambidentate with the possibility of a variety of coordination modes, depending among other factors upon hydrogen bonding, electron distribution and steric hindrance. In this respect we have already studied several transition metal complexes of aromatic hydroxyaryloximes to establish the chemical, electronic and redox properties of the various coordination geometries obtainable with the oxime systems [6,7]. Our results were found to be in accordance with well-established X-ray structure determinations of the trans square-planar geometry of some salicylaldoximates [7][8][9].…”

Section: Introductionsupporting

confidence: 78%

“…In the IR spectra of the ligands, the stretching mode of the oximino hydroxyl group was observed as an intense broad band at 3360-2_30 cm -I [6,7]. The variation in the position of this band reveals the influence of the substituents.…”

Section: Infrared Spectramentioning

confidence: 98%

“…Since we know that the 2-hydroxyaryloxime ligands give an intense chargetransfer band with transition metals [6,7], it is reasonable to assign the band found at 510 nm as the charge-transfer band. This is in agreement with what was found for the Fe(III) low-spin octahedral complex [Fe(o-vanillinoxime)2(H20)2]Cl [14].…”

Section: Electronic Spectramentioning

confidence: 99%

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Spectral and thermal features of some novel iron(III) chelates with substituted 2-hydroxyaryloximes

Hartophylles

Lalia‐Kantouri

1997

Journal of Thermal Analysis

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The reaction products of five substituted 2-hydmxyaryloximes with Fe(III) ion were obtained and characterized by means of elemental analysis, conductometric measurements, magnetic moment determinations and spectroscopic data (IR and electronic absorption).The thermal stability and mode of decomposition were studied in air atmosphere by using TG-DTA. Kinetic analysis of the TG data was performed with the Coats-Redfern method to determine the apparent activation energies and the pre-exponential factor of the Arrhenius equation. Mass spectrometry was also used, and possible fragmentation patterns are given and discussed.

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Section: Introductionsupporting

confidence: 78%

Section: Infrared Spectramentioning

confidence: 98%

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Spectral and thermal features of some novel iron(III) chelates with substituted 2-hydroxyaryloximes

Hartophylles

Lalia‐Kantouri

1997

Journal of Thermal Analysis

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“…In all cases the 2 B 1g ! 2 B 2g transition is usually not observed as a separate band in the tetragonal field [14,15]. The bands above 25,000 cm )1 in some cases, may be due to charge transfer, which may arise from the transfer of an electron from an orbital largely belonging to a central atom .…”

Section: Electronic Spectramentioning

confidence: 99%

Electronic, e.p.r., cyclic voltammetric and biological activities of copper(II) complexes with macrocyclic ligands

Chandra

Sangeetika

Thakur

2004

Transition Met Chem

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Eight new macrocyclic ligands have been prepared by the reaction of the precursor diketone (benzil, glyoxal, diacetyl or 2,3-pentanedione) with a diamine (thiosemicarbazide or semicarbazide). Copper(II) complexes of these ligands have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility, i.r., u.v.-vis, 1 H-n.m.r., mass and e.p.r. spectral studies. Mass, n.m.r. and i.r. data indicate the condensation of the diamine and diketone and the whole molecular ion structure. g-Values are calculated for all of the complexes in polycrystalline form as well as in DMSO solution. Spin Hamiltonian values and bonding parameters have also been calculated which indicates that an unpaired electron is present in the d x 2 Ày 2 orbital. The metal-ligand bonding parameters shows strong in-plane r sigma and in-plane p bonding. The magnetic and spectral data indicate tetragonal geometry for all of the complexes except [CuH 2 L 4 ]Cl 2 and [CuH 2 L 4 ]Cl 2 which are square planar. From c.v. data reversible Cu II /Cu I couples are observed for these complexes. The macrocyclic complexes show more antibacterial and antiviral activity as compared to the ligands. The antibacterial activities of the compounds were tested against S. aureus, S. subtillis and E. coli.

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“…In addition, the crystal and molecular structure of the trans-bis[propanone,l-(2-hydroxyphenyl)-oximato]copper(II), abbreviated as bis(2-OHpropiophenoneoximato)copper(II), [Cu(ppox)z], was investigated as part of a research program on copper(I1) 2-OH oximates developed in our laboratory [2,71 with the object of gaining information on Cu-0 and Cu-N bonds and on the structures of oxime ligands.…”

mentioning

confidence: 99%

Synthesis and spectroscopic Investigation of Mixed‐Ligand Copper Chelates containing 2‐hydroxyaryloximes and N‐disubstituted dithiocarbamates. Crystal and molecular structure of trans‐bis[propanone, 1‐(2‐hydroxy‐phenyl)oximato] copper(II)

Lalia‐Kantouri

Uddin

Hadjikostas

et al. 1997

Zeitschrift anorg allge chemie

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A series of mixed-ligand copper(I1) chelates containing the anion of 2-hydroxyaryloxime(oxime) and N,N-disubstituted dithiocarbamate(dtc), [Cu(dtc)(oxime)], was prepared and characterised. The spectra (IR, ESR, electronic excitation) indicate that the CuNOS2 chromophore attains square planar geometry. The ESR observables suggest appreciable covalency. In the case of [Cu(Et2dtc)(oxime)] chelates, however, the observed data suggest distortion from square planar arrangement to a square pyramidal, indicative of a possible dimerism.In addition, the structure of the trans-bis[propanone, 1-(2-hydroxyphenyl)-oximato]copper(II), Cu(CgH10N02)2 was determined by X-ray piffraction (mon?clinic, space gro!p P21/n, a = 12.072 (7) A, b = 5.204(2) A, c = 13.571(6) A, p = 103.72(1)", Z = 2). The molecule consists of discrete C~( p p o x )~ monomeric units, where the Cu atom is in the equatorial plane bonded to two nitrogen ?toms and two oxygen at distances of 1.949(2) and 1.882 (2) A, respectively. Synthese und spektroskopische Untersuchung von gemischten Kupfer-Chelaten von 2-Hydroxyaryloxim und N-substituierten Dithiocarbamaten. Kris t allund Mole kulars t ru kt ur von trans-Bis[propanon, 1-(2-hydroxyphenyl)-oximato]Kupfer(II) Inhaltsiibersicht. Kupfer(I1) Chelate mit den Anionen von 2-Hydroxyaryloxim (oxime) und N,N-disubstituieren Dithiocarbamaten (dtc), [Cu(dtc)(oxime)], wurden dargestellt und charakterisiert. Die Spektren (IR, ESR, elektronische Anregung) zeigen, daB die chromophore Einheit CuNOSz quadratisch planar ist. ESR-Beobachtungen indizieren einen starken covalenten Charakter. Bei den Chelaten [Cu(Et2dtc)(oxime)], deuten die experimentellen Daten auf eine Verzerrung zu einer quadratischen Pyramide, was moglicherweise auf eine Dimerisierung hinweist. Die Struktur des trans-bis[propanon,l-(2-hydroxyphenyl)oximato]Kupfer(II), Cu(CgH10N02)2, wurde rontgenographisth bestimmt (Fonoklin, R a u m p p p e P~& I , a = 12.072(7) A, b = 5.204(2) A, c = 13.571(6) A, p= 103.72(1)", Z = 2). Das Molekul besteht aus isolierten monomeren Cu(ppox)z-Einheiten, in denen das Cu Atom in der aquatorialen Ebene liegt und an zwei Stickstoff-und zwei Sauerstoffatomen in Abstanden von 1.949(2) bzw. 1.882(2) gebunden ist. 4 [Cu(Pipdtc)(ppox)] 5 [Cu(Pipdtc)(bpox)] 6 [Cu(Pipdtc)(opox)] 7 [Cu(Etzdtc)(saox)] 8 [Cu(Etzdtc)(apox)] 9 [Cu(Etzdtc)(mpox) 10 [C~(Etzdtc)(ppox)] 11 [C~(EtZdt~)(bpox)] 12 [C~(Etzdt~)(opo~)] 13 [Cu(Benzzdtc)( saox)] 14 [Cu( Benzzdtc)( apox)] 15 [ Cu( B enz,dtc) (mpox)] 16 [Cu(Benzzdtc)(ppox)] 17 [Cu(Benzzdtc)(bpox)] 18 [Cu(Benzzdtc)(opox)]

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Spectral and ESR features of some copper(II) chelates with 2-hydroxyaryloximes

Cited by 15 publications

References 29 publications

Spectral and thermal features of some novel iron(III) chelates with substituted 2-hydroxyaryloximes

Spectral and thermal features of some novel iron(III) chelates with substituted 2-hydroxyaryloximes

Electronic, e.p.r., cyclic voltammetric and biological activities of copper(II) complexes with macrocyclic ligands

Synthesis and spectroscopic Investigation of Mixed‐Ligand Copper Chelates containing 2‐hydroxyaryloximes and N‐disubstituted dithiocarbamates. Crystal and molecular structure of trans‐bis[propanone, 1‐(2‐hydroxy‐phenyl)oximato] copper(II)

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