Exchange in mixtures of cadmium with bis(benzimidazoles)

Dakers, Mark A. R.; Hill, M. N. Stuart; Lockhart, J. C.; Rushton, David J.

doi:10.1039/dt9940000209

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…An exploration of the exchange processes occurring in mixtures of HgBr 2 with the asymmetric bis(benzimidazole) ligand 1 was conducted which complemented the work previously reported by our group on similar Cd(II) systems . Some structural information on coordination of the ligand in solution to Zn(II), Cd(II), and Hg(II) (in competition with the donor solvent DMSO) was adduced.…”

Section: Introductionmentioning

confidence: 91%

Coordination of Zn(II), Cd(II), Hg(II), and Ag(I) by Bis(benzimidazole) Ligands

et al. 1998

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The coordinating environments provided by the 1-(5,6-dimethylbenzimidazolyl)-3-benzimidazolyl-2-thiapropane (1), 1-(5,6-dimethylbenzimidazolyl)-3-benzimidazolyl-2-oxapropane (2), 1-(N-methyl)benzimidazolyl-3-benzimidazolyl-2-oxapropane (3), and 1,7-bis(benzimidazol-2-yl)-2,6-dithiaheptane (4) ligands for a series of soft-to-borderline metal ions have been demonstrated by crystallographic structure determination in the solid state, supplemented by multinuclear NMR studies in solution. Structures of [Zn(3)(H2O)(MeCN)](ClO4)2 ([C19H21N5O2Zn](ClO4)2, monoclinic, space group P21/c, a = 10.3247(11) Å, b = 11.0320(12) Å, c = 20.761(2) Å, β = 96.465(3)°, V = 2349.7(4) Å3, Z = 4), [Zn(1)Cl2]·CH3OH ([C18H18Cl2N4SZn]·CH4O, triclinic, space group P1̄, a = 9.0917(9) Å, b = 9.9186(10) Å, c = 12.2079(12) Å, α = 99.710(3)°, β = 94.252(2), γ = 95.598(3)°, V = 1075.3(2) Å3, Z = 2), [Hg(1)Br2]·CH3OH ([C18H18Br2HgN4S]·CH4O, triclinic, space group P1̄, a = 9.1956(12) Å, b = 9.9775(13) Å, c = 12.462(2) Å, α = 99.239(3), β = 97.676(3)°, γ = 94.036(3)°, V = 1113.4(3) Å3, Z = 2), [Cd(1)Cl2] ([C18H18CdCl2N4S], monoclinic, space group P21/n, a = 14.5219(11) Å, b = 8.5315(7) Å, c = 15.6182(12) Å, β = 92.063(2)°, V = 1933.7(3) Å3, Z = 4), and [Ag(4)](NO3) ([C19H20AgN4S](NO3), monoclinic, space group C2/c, a = 13.7339(3) Å, b = 17.2710(1) Å, c = 9.8866(2) Å, β = 115.399(1)°, V = 2118.4(1) Å3, Z = 4) have been determined. Ligand 3 provided the expected N2O donor set to Zn(II) forming part of a pseudo-trigonal bipyramidal coordinating environment, tentatively extrapolated to the Zn(II), Cd(II), and Hg(II) complexes of ligand 2 from 1H NMR studies. The thioether-bridged ligands (1 and 4) displayed a strikingly different coordination mode; in none of these structures was the thioether found to be coordinated to the central metal ion, resulting in pseudotetrahedral structures for the Zn(II) and Hg(II) complexes of ligand 1, a bis(chloro)-bridged dimeric five-coordinate complex of Cd(II) with ligand 1, and a near-linear coordination mode for the Ag(I) complex of ligand 4. No significant distinction in geometric parameters around the metal ions could be observed resulting from the introduction of asymmetry and a change of pK a within the bis(benzimidazole) ligands. Using 199Hg NMR spectroscopy, it was demonstrated that the thioether of ligand 1 did not coordinate in solutions of the 1:1 HgBr2 complex; negligible shifts of the signals corresponding to the aliphatic bridging protons in the 1H NMR spectra of ligand 1 when coordinated to Zn(II), Cd(II), and Hg(II) also suggested a noncoordinating behavior. Exchanges occurring in mixtures of HgBr2 and ligand 1 were examined using 199Hg, 13C, and 1H NMR. It is considered that there is little or no exchange occurring in a region of excess mercury on the 199Hg NMR time scale, and in a region of excess ligand 1 the 1/1 complex predominates.

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Section: Introductionmentioning

confidence: 91%

Coordination of Zn(II), Cd(II), Hg(II), and Ag(I) by Bis(benzimidazole) Ligands

et al. 1998

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“…11 So, the coordination chemistry of Pb(II) has recently been investigated and frequently discussed in regard to the coordination and stereoactivity of the valence shell lone electron pair besides its great potential uses to extract harmful metals from the environment. [12][13][14][15][16][17] To the best of our knowledge, only a few lead(II) carboxylate-bridged complexes with layered or 3D network structures have been reported. [18][19][20][21][22] The work presented here uses 5-amino-2,4,6-triiodoisophthalic acid (H 2 ATIBDC) as the organic moiety (Scheme 1), which is based mostly on the following considerations: (1) Compared with 5-aminoisophthalic acid (H 2 aip), the introduction of three I atoms greatly increases the solubility of H 2 ATIBDC in water.…”

Section: Introductionmentioning

confidence: 99%

Effect of N-donor auxiliary ligands on the engineering of crystalline architectures of a series of lead(ii) complexes with 5-amino-2,4,6-triiodoisophthalic acid

et al. 2010

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The aqueous medium reactions of lead(II) nitrate with H 2 ATIBDC as a main ligand and bipy or biim as an auxiliary ligand lead to the two fascinating coordination polymers:and H 2 ATIBDC ¼ 5-amino-2,4,6-triiodoisophthalic acid]. The interesting chiral three-dimensional (3D) network [Pb(ATIBDC)] (3) is obtained in the absence of any auxiliary ligands.Complex 1 is a one-dimensional (1D) helical chain, which further arrays into a 3D supramolecular metal-organic framework (MOF) with a 1D channel through the hydrogen-bonding and strong offset p/p stacking interactions. Furthermore, a 1D hydrogen-bonded helical water chain was found in 1. Interestingly, complex 1 exhibits reversible adsorption/desorption to water molecules. Framework 1 falls within the category of ''recoverable collapsing'' and ''guest-induced re-formation'' frameworks. Complex 2 features a fascinating 3D MOF. It displays a novel four-connected 4 6 6 8 -SOD (sodalite) zeotype network structure with 1D nanotubular channels. Complex 3 crystallizes in the chiral space group P3 1 and possesses a 3D honeycomb-like structure built up from a 1D Pb(II)-carboxylate-bridged helical chain with a 3 1 helix and ATIBDC 2À ligand. The coordination modes of the ATIBDC 2À ligand and crystalline architectures of the complexes are greatly dependent on the auxiliary ligands. The thermal stability and solid state fluorescent properties have been studied. Adsorption/desorption properties reveal that 2 may be used as an adsorbent material for some guest molecules. The study broadens the still very limited use of H 2 ATIBDC as a spacer and lead(II) ion for crystal engineering of MOFs with channels and cavities. These compounds represent the first examples of lead(II) complexes with H 2 ATIBDC.

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“…Coordination chemistry of lead(II) with N and O donor ligands has been investigated with regard to the stereoactivity of the valence shell lone electron pair, besides examining the potential to extract harmful metals from the environment [15][16][17][18][19][20]. Since a lone pair is not directly detected but inferred on the basis of the spatial distribution of donor atoms surrounding the metal, it is not a straightforward process.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a metal-organic three-dimensional framework based on isonicotinate [Pb(INA)₂] (INA = isonicotinate, NC₅H₄-4- )

Zhang

Zhou

Gao

et al. 2008

Journal of Coordination Chemistry

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Guo (2008) Preparation and characterization of a metal-organic three-dimensional framework based on isonicotinate [Pb(INA) 2 ] (INA = isonicotinate, NC 5 H 4 -4-), Journal of Coordination Chemistry, The coordination compound [Pb(INA) 2 ] (INA ¼ isonicotinate, NC 5 H 4 -4-CO À2 ) has been synthesized and characterized by elemental analysis, FT-IR spectra and thermogravimetric analysis. Its structure was confirmed by X-ray crystallography. The single-crystal X-ray data of this compound show a three-dimensional wave-like metal-organic framework as a result of INA ligand bridging. The lead atom has an unsymmetrical eight-coordinate geometry, coordinated by two nitrogen atoms and six oxygen atoms from the INA ligand. The arrangement of the INA ligands exhibits a coordination gap around the Pb atom occupied possibly by a stereoactive lone pair of electrons on lead(II), with the coordination around lead atoms being hemidirected. There are -stacking interactions between adjacent parallel INA ligands which act as a pillar that increases the gap in the coordination geometry around Pb(II). Photoluminescence properties of the compound have been examined in the solid state at room temperature. The compound has photoluminescence with maximum emission located in the UV region.

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Exchange in mixtures of cadmium with bis(benzimidazoles)

Cited by 17 publications

References 8 publications

Coordination of Zn(II), Cd(II), Hg(II), and Ag(I) by Bis(benzimidazole) Ligands

Coordination of Zn(II), Cd(II), Hg(II), and Ag(I) by Bis(benzimidazole) Ligands

Effect of N-donor auxiliary ligands on the engineering of crystalline architectures of a series of lead(ii) complexes with 5-amino-2,4,6-triiodoisophthalic acid

Preparation and characterization of a metal-organic three-dimensional framework based on isonicotinate [Pb(INA)₂] (INA = isonicotinate, NC₅H₄-4- )

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Exchange in mixtures of cadmium with bis(benzimidazoles)

Cited by 17 publications

References 8 publications

Coordination of Zn(II), Cd(II), Hg(II), and Ag(I) by Bis(benzimidazole) Ligands

Coordination of Zn(II), Cd(II), Hg(II), and Ag(I) by Bis(benzimidazole) Ligands

Effect of N-donor auxiliary ligands on the engineering of crystalline architectures of a series of lead(ii) complexes with 5-amino-2,4,6-triiodoisophthalic acid

Preparation and characterization of a metal-organic three-dimensional framework based on isonicotinate [Pb(INA)2] (INA = isonicotinate, NC5H4-4- )

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Preparation and characterization of a metal-organic three-dimensional framework based on isonicotinate [Pb(INA)₂] (INA = isonicotinate, NC₅H₄-4- )