FT-IR and XPS study of copper(II) complexes of imidazole and benzimidazole

Drolet, Denis P.; Manuta, David M.; Lees, Alistair J.; Katnani, A. D.; Coyle, George J.

doi:10.1016/s0020-1693(00)80605-2

Cited by 107 publications

(55 citation statements)

References 24 publications

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“…53 Immersing the imidazole functionalised cloth into aqueous palladium(II) chloride followed by rinsing in water gave rise to the appearance of palladium and chlorine XPS signals, signifying surface complex formation, Figure 2 and Scheme 1. This was accompanied by the relative attenuation in the 398.7 eV C=N environment, which is consistent with metal complexation to imidazole ligand C=N centres entailing nitrogen lone pair donation to the positively charged metal centre causing a decrease in electron density around the complexing nitrogen atom (increase in N(1s) XPS binding energy 46,58 ), Figure 3.…”

Section: Surface Tethering Of Palladium Catalystsupporting

confidence: 58%

Recyclable palladium catalyst cloths for carbon-carbon coupling reactions

Wilson

Kore

Fraser

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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(2017) 'Recyclable palladium catalyst cloths for carbon-carbon coupling reactions.', Colloids and surfaces A : physiochemical and engineering aspects., 520 . pp. 788-795. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. product yields (54%, 82%, and 99% respectively) and selectivities (99%, 93%, and greater than 99% respectively) have been measured. These palladium catalyst cloths show low levels of metal leaching and can be recycled multiple times.

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Section: Surface Tethering Of Palladium Catalystsupporting

confidence: 58%

Recyclable palladium catalyst cloths for carbon-carbon coupling reactions

Wilson

Kore

Fraser

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…All CuLxCI 2 (L = IMDAH, BIMDAH, BTAH, 5MBTAH, PDZ, PYM; x = 2 and 4) complexes were prepared by reacting the appropriate ratio of cupric chloride with ligand in dry ethanolic solution at ambient temperature, according to a previously described procedure [5]. The Cu(BIMDA)2 complex (BIMDA = deprotonated form of BIMDAH) was prepared in 0.1 M NaOH solution as noted previously [5].…”

Section: Methodsmentioning

confidence: 99%

“…The Cu(BIMDA)2 complex (BIMDA = deprotonated form of BIMDAH) was prepared in 0.1 M NaOH solution as noted previously [5].…”

Section: Methodsmentioning

confidence: 99%

“…To investigate the metal-azole chemistry and their thermal properties, several model complexes have been prepared by directly reacting the free ligand with a metal compound. Previously, we and others have used X-ray photoelectron spectroscopy (XPS) [3,5], Fourier transform infrared spectroscopy (FTIR) [5], and X-ray diffraction [6] to study the coordination chemistry of these materials. In the current work we employ thermogravimetric (TG) analysis to investigate their thermal decomposition mechanisms [4].…”

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confidence: 99%

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Thermal decomposition of copper-azole complexes

Katnani

Papathomas

Drolet

et al. 1989

Journal of Thermal Analysis

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The thermal decomposition of complexes of the formulae: Cu(IMDAH)xCI 2, Cu(BIMDAH)~C12 (x = 2 or 4), Cu(BTAH)2CI2, Cu(5MBTAH)2C12, Cu(BIMDA)2, Cu(PDZ)C12, and Cu(PYM)CI2 (IMDAH = imidazole, BIMDAH = benzimidazole; BTAH = benzotriazole; 5MBTAH = 5-methyl-benzotriazole; PDZ = pyridazine; PYM = pyrimidine) has been studied in an oxidizing environment using thermogravim~tric (TG) analysis. The TG profiles of all the complexes indicate degradation of the azole ligands and conversion to copper oxides. The Cu-azole complexes retain much higher fractions of the Cu in the degradation residue than the Cu(PDZ)C12 and Cu(PYM)CI 2 complexes which volatilize most of the Cu on thermal decomposition. These differences are interpreted on the basis ofmetalligand bonding and the participation of redox reactions in the thermal decomposition mechanism.Azole ligands are used extensively as corrosion inhibitors in the antique [1] and printed circuit board industries [2]. The coordination nature of the metal-azole bonding as well as the molecular bond strength are important factors in determining the effectiveness of the corrosion inhibition process [3,4]. To investigate the metal-azole chemistry and their thermal properties, several model complexes have been prepared by directly reacting the free ligand with a metal compound. Previously, we and others have used X-ray photoelectron spectroscopy (XPS) [3,5], Fourier transform infrared spectroscopy (FTIR) [5], and X-ray diffraction [6] to study the coordination chemistry of these materials. In the current work we employ thermogravimetric (TG) analysis to investigate their thermal decomposition mechanisms [4].Several authors have studied the effect of coordination chemistry and lattice distortion on the thermal stability of metal complexes [7][8][9].

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“…For example, azoles have been used as corrosion inhibitors for metals and alloys [1] and complexes formed between azotes and Cu or Pd metals have been used to model biological structures and in anti-tumor drug therapy [2,3]. The nature of chemical bonding in Cu-azole complexes has been studied by several techniques including Xray photoelectron spectroscopy (XPS) [4,5], Fourier transform infrared spectroscopy (FTIR) [6], and X-ray diffraction [7]. However, at this time relatively little work has appeared on Pd-azole compounds.…”

mentioning

confidence: 99%

Thermal decomposition of palladium-imidazole complexes

Katnani

Papathomas

Drolet

et al. 1989

Journal of Thermal Analysis

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Two Pd-imidazole complexes have been synthesized following the reaction of PdCI2 and imidazole at 1:2 and 1:4 metal:ligand ratios. Elemental and thermogravimetdc analytical data obtained from these compounds illustrate that they have the formulae Pd(IMDAH)2C12-4H20 and Pd(IMDAH)3C12 (MDAH = imidazole), respectively. The mechanism of thermal decomposition for these complexes in air involves initial dissociation of I-I20 and IMDAH ligands in the 120--340 *C range, subsequent dissociation of the chloride atoms to form PdO in the 530--570 "C range, and finally formation of Pd metal at 820-840 *C.Heterocyclic iigands are used in several industrial and medical applications. For example, azoles have been used as corrosion inhibitors for metals and alloys [1] and complexes formed between azotes and Cu or Pd metals have been used to model biological structures and in anti-tumor drug therapy [2,3]. The nature of chemical bonding in Cu-azole complexes has been studied by several techniques including Xray photoelectron spectroscopy (XPS) [4,5], Fourier transform infrared spectroscopy (FTIR) [6], and X-ray diffraction [7]. However, at this time relatively little work has appeared on Pd-azole compounds.Pd-IMDAH (IMDAH = imidazole) complexes may be useful in industry as catalytic agents in epoxy curing reactions. For such applications the thermal stability of the complex could influence the curing mechanism of the resin and subsequently its physical properties. Previously, several Pd-IMDAH complexes have been prepared and characterized by FTIR spectroscopy [3]. This paper reports the synthesis and elemental characterization of two Pd-IMDAH complexes and describes their mechanism of thermal decomposition.

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FT-IR and XPS study of copper(II) complexes of imidazole and benzimidazole

Cited by 107 publications

References 24 publications

Recyclable palladium catalyst cloths for carbon-carbon coupling reactions

Recyclable palladium catalyst cloths for carbon-carbon coupling reactions

Thermal decomposition of copper-azole complexes

Thermal decomposition of palladium-imidazole complexes

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