Binuclear metal complexes. 1. Dicopper(II) complexes with binucleating ligands derived from 2-hydroxy-5-methylisophthalaldehyde and 2-(2-aminoethyl)pyridine or histamine

Grzybowski, Joseph J.; Merrell, Philip H.; Urbach, F. L.

doi:10.1021/ic50189a022

Cited by 75 publications

(25 citation statements)

References 25 publications

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“…The charge transfer transitions are from the p-orbital of the phenolic oxygen to the vacant d-orbitals of the copper(II) atom. Similar charge transfer bands have been observed in several oxobridged copper(II) complexes [15]. In addition to charge transfer bands, the copper(II) complexes of the ligands H 2 L 1 and H 2 L 2 under the present investigation showed three bands at 10309 and 10256 cm )1 , 14482 and 14285 cm )1 and 18518 and 18348 cm )1 , corresponding to three transitions from 2 B 1 fi 2 A 1 (m 1 ), 2 B 1 fi 2 B 2 (m 2 ) and 2 B 1 fi 2 E (m 3 ) respectively.…”

Section: Electronic Spectrasupporting

confidence: 83%

Synthesis, characterization and antimicrobial activity of macrocylic phenoxo-bridged di- and tetra-nuclear complexes from N,N-bis[2,6-diiminomethyl-4-methyl-1-hydroxyphenyl]succinoyl/sebacoyldicarboxamides

Mruthyunjayaswamy

Jadegoud

Ijare

et al. 2005

Transition Met Chem

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Macrocyclic ligands N,succinoyl dicarboxamide (H 2 L 1 ) and N,N-bis[2,6-diiminomethyl-4-methyl-1-hydroxyphenyl]sebacoyl dicarboxamide (H 2 L 2 ) were synthesized and characterized by various spectral techniques. Macrocyclic di-and tetra-homonuclear phenoxo bridged Cu II , Co II , Ni II , Zn II , Cd II and Hg II complexes have been synthesized through the template method by using the precursors 2,6-diformyl-4-methylphenol, succinoyldihydrazide/ sebacoyldihydrazide and respective metal chlorides in 2:2:2/2:2:4 ratio respectively. The synthesized complexes were characterized by i.r., n.m.r., u.v.-vis., FAB-mass, e.s.r., magnetic susceptibility and elemental analyses data. The elemental analyses and FAB-mass spectral data have justified the dinuclear and tetra nuclear structure for the complexes of the ligands H 2 L 1 and H 2 L 2 respectively. The observed low magnetic moment values revealed the existence of antiferromagnetic spin exchange interaction operating between the two metal centers. Electronic data suggested the octahedral geometry for Ni II complexes and square pyramidal geometry for Cu II , Co II , Zn II , Cd II and Hg II complexes of both the ligands. The Cu II , Co II and Zn II complexes of both the ligands have shown good antifungal activity against Aspergillus niger and Fusarium oxysporum and medium to weak antibacterial activity against Escherichia coli and Staphylococcus aureus when compared to the standard drugs Grisefulvin and Ciprofloxacin respectively.

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Section: Electronic Spectrasupporting

confidence: 83%

Synthesis, characterization and antimicrobial activity of macrocylic phenoxo-bridged di- and tetra-nuclear complexes from N,N-bis[2,6-diiminomethyl-4-methyl-1-hydroxyphenyl]succinoyl/sebacoyldicarboxamides

Mruthyunjayaswamy

Jadegoud

Ijare

et al. 2005

Transition Met Chem

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“…In all complexes except Co(II), Fe(III), and Hg(II), broad absorption bands in the region 3451-3406 cm À1 are assigned to v(OH) of H 2 O. IR data indicate HL coordinates pentadentate through carbonyl oxygen, azomethine nitrogen, and phenolic-oxygen via deprotonation. Medium intensity bands from 1533 to 1512 cm À1 are assigned to bridged phenolic-oxygen vibrations [21,22], additional evidence for coordination of phenolic-oxygen [21].…”

Section: Ir Spectramentioning

confidence: 99%

Phenoxo-bridged symmetrical homobinuclear complexes derived from an “end-off” compartmental ligand, 2,6- bis [5′-chloro-3′-phenyl- 1H -indole-2′-carboxamidyliminomethyl]-4-methylphenol

Rahaman

Ijare

Jadegoud

et al. 2009

Journal of Coordination Chemistry

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A compartment ligand 2,6-bis[5 0 -chloro-3 0 -phenyl-1H-indole-2 0 -carboxamidyliminomethyl]-4-methylphenol was prepared and homobinuclear phenol-bridged Cu(II), Ni(II), Co(II), Zn(II), Cd(II), Hg(II), Fe(III), and Mn(II) complexes have been prepared by the template method using the precursors 2,6-diformyl-4-methylphenol, 5-chloro-3-phenylindole-2-carbohydrazide and metal chlorides in 1 : 2 : 2 ratio, respectively. The complexes were characterized by elemental analyses, conductivity measurements, magnetic susceptibility data, IR, NMR, FAB mass and ESR spectra, TGA, and powder XRD data. Cu(II), Co(II), Zn(II), Cd(II) and Hg(II) complexes exhibit square pyramidal geometry whereas Ni(II), Mn(II), and Fe(III) complexes are octahedral. Low magnetic moment values for Cu(II), Ni(II), Co(II), Fe(III), and Mn(II) complexes show antiferromagnetic spin-exchange interaction between two metal centers in binuclear complexes. The ligand and its complexes were tested for antibacterial activity against Escherichia coli and Staphyloccocus aureus, and antifungal activity against Aspergillus niger and Candida albicans.

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“…Spectroscopic techniques were used to elucidate the structure of the complexes. The OH-bridged complexes exhibit a broad IR band around 3480-3600 cm -1 due to the OH stretching 8,9 . The perchlorate salts show a strong band near 1100 cm -1 and sharp band around 620-630 cm -1 indicative of the uncoordinated perchlorate anion 10,11 .…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Synthesis and physiochemical studies on binuclear Cu(II) complexes derived from 2,6-[(N-phenylpiperazin-1-yl)methyl]-4-substituted phenols

et al. 2001

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Preparation of the ligands HL 1 = 2,6-[(N-phenylpiperazin-1-yl)methyl]-pethylphenol; HL 2 = 2,6-[(N-phenylpiperazin-1-yl)methyl]-p-methoxyphenol and HL 3 = 2,6-[(N-phenylpiperazin-1-yl)methyl]-p-nitrophenol are described together with their Cu(II) complexes with different bridging units. The exogenous bridges incorporated into the complexes are: hydroxo [Cu 2 L(OH)(H 2 O) 2 ](ClO 4) 2 .H 2 O (L 1 = 1a, L 2 = 1b, L 3 = 1c), acetato [Cu 2 L(OAc) 2 ]ClO 4 .H 2 O (L 1 = 2a, L 2 = 2b, L 3 = 2c) and nitrito [Cu 2 L 1 (NO 2) 2 (H 2 O) 2 ]ClO 4 .H 2 O (L 1 = 3a, L 2 = 3b, L 3 = 3c). Complexes 1a, 1b, 1c and 2a, 2b, 2c contain bridging exogenous groups, while 3a, 3b, 3c possess only open µ-phenolate structures. Both the ligands and complexes were characterized by spectral studies. Cyclic voltammetric investigation of these complexes revealed that the reaction process involves two successive quasireversible one-electron steps at different potentials. The first reduction potential is sensitive to electronic effects of the substituents at the aromatic ring of the ligand system, shifting to positive potentials when the substituents are replaced by more electrophilic groups. EPR studies indicate very weak interaction between the two copper atoms. Various covalency parameters have been calculated.

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Binuclear metal complexes. 1. Dicopper(II) complexes with binucleating ligands derived from 2-hydroxy-5-methylisophthalaldehyde and 2-(2-aminoethyl)pyridine or histamine

Cited by 75 publications

References 25 publications

Synthesis, characterization and antimicrobial activity of macrocylic phenoxo-bridged di- and tetra-nuclear complexes from N,N-bis[2,6-diiminomethyl-4-methyl-1-hydroxyphenyl]succinoyl/sebacoyldicarboxamides

Synthesis, characterization and antimicrobial activity of macrocylic phenoxo-bridged di- and tetra-nuclear complexes from N,N-bis[2,6-diiminomethyl-4-methyl-1-hydroxyphenyl]succinoyl/sebacoyldicarboxamides

Phenoxo-bridged symmetrical homobinuclear complexes derived from an “end-off” compartmental ligand, 2,6- bis [5′-chloro-3′-phenyl- 1H -indole-2′-carboxamidyliminomethyl]-4-methylphenol

Synthesis and physiochemical studies on binuclear Cu(II) complexes derived from 2,6-[(N-phenylpiperazin-1-yl)methyl]-4-substituted phenols

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