Dinuclear copper(II) complexes incorporating a novel pyrazolo-based ligand with S- and N-rich coordination spheres

Chou, Jeh Li; Chyn, Jong Pyng; Urbach, F. L.; Gervasio, D.

doi:10.1016/s0277-5387(00)00529-5

Cited by 34 publications

(16 citation statements)

References 39 publications

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“…These ligands are able to coordinate by both S and the neighbouring N atom, and hence to form stable chelate rings of five or more atoms [35][36][37][38][39][40][41]. In particular, Gardinier [42,43] and Casas [44] have recently reported the synthesis, the analytic, spectroscopic and structural characterization of the bis(thioimidazolyl)methane family of compounds.…”

Section: Introductionmentioning

confidence: 99%

Di- and tri-organotin(IV) complexes of the new bis(1-methyl-1H-imidazol-2-ylthio)acetate ligand and the decarboxylated analogues

Pellei

Alidori

Benetollo³

et al. 2008

Journal of Organometallic Chemistry

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Section: Introductionmentioning

confidence: 99%

Di- and tri-organotin(IV) complexes of the new bis(1-methyl-1H-imidazol-2-ylthio)acetate ligand and the decarboxylated analogues

Pellei

Alidori

Benetollo³

et al. 2008

Journal of Organometallic Chemistry

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“…In summary, although pyrazole-bridged complexes have been reported previously, [26,[55][56][57] the study is concentrated on the structure and magnetism. Our work provides two halo-bridged 1,2,4-triazole-based Cu II complexes showing efficient chemical nucleases in the presence of activators.…”

Section: Discussionmentioning

confidence: 99%

Synthesis, X‐ray Crystal Structures, DNA Binding and Nuclease Activities of Two Novel 1,2,4‐Triazole‐Based Cu^II Complexes

Tian

et al. 2009

Eur J Inorg Chem

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Two novel 1,2,4‐triazole‐based copper(II) complexes have been synthesized and structurally characterized by X‐ray crystallography: [Cu2LCl3]·0.5[CuCl4]·EtOH (1) and [Cu2LBr3]·Br·H2O (2) (L = 3,5‐bis{[bis(2‐methoxyethyl)amino]methyl}‐4H‐1,2,4‐triazol‐4‐amine). Single‐crystal diffraction reveals that the two Cu atoms have a distorted octahedral geometry for 2, but one Cu atom is in a distorted square‐pyramidal environment and the other one is in a distorted octahedral environment for 1 because of the different bridged halogen atoms. The interactions of the two complexes with calf thymus DNA (CT‐DNA) have been investigated by UV absorption, fluorescence spectroscopy, circular dichroism spectroscopy, viscosity measurements and cyclic voltammetry. The apparent binding constant (Kapp) values for complexes 1 and 2 are 2.98 × 106 and 4.05 × 106 M–1. Furthermore, both the compounds display efficient oxidative cleavage of supercoiled DNA in the presence of external agents. The rate constants for the conversions of supercoiled to nicked DNA are 4.38 × 10–4 s–1 (for 1) and 5.26 × 10–4 s–1 (for 2). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2010)

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“…Among them, the S,N¢-donor ligands are particularly attractive because they can be used as constituents of protein models [2]. Many new S,N¢-ligands with a nitrogenated aromatic ring system such as pyridine or benzimidazole have been synthesized to act as spacers for the construction of transition metal coordination polymer, the main interesting point is that the strengths of the M-N and M-S bonds vary inversely to each other as the metal M changes [3]. Recently the coordination chemistry of the bis(2-pyridylthio)-methane as a versatile ligand has been well investigated, showing a variety of different coordination modes based upon the flexibility of the M-N and M-S bonds [4].…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of bis(2-pyrimidylthio)methane, C9H8N4S2

Liu

Zhang

2003

Zeitschrift Für Kristallographie - New Crystal Structures

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Source of material 2-Mercaptopyrimidine (224 mg, 2.0 mmol) was added to a solution of NaOH (200 mg, 5 mmol) in 15 mL of absolute ethanol. After stirring for 2 hours, 4 mL of CH 2Cl2 diluted with 5 mL of absolute ethanol was added drop-wise to the sodium salt so-obtained, and the mixture was stirred at reflux overnight. The resulting suspension was filtered and the filtrate was concentrated, affording colorless needle crystalline product (yield 73% DiscussionMany classes of ligands have been designed to synthesize supramolecular networks with rich structural types [1]. Among them, the S,N¢-donor ligands are particularly attractive because they can be used as constituents of protein models [2]. Many new S,N¢-ligands with a nitrogenated aromatic ring system such as pyridine or benzimidazole have been synthesized to act as spacers for the construction of transition metal coordination polymer, the main interesting point is that the strengths of the M-N and M-S bonds vary inversely to each other as the metal M changes [3]. Recently the coordination chemistry of the bis(2-pyridylthio)-methane as a versatile ligand has been well investigated, showing a variety of different coordination modes based upon the flexibility of the M-N and M-S bonds [4]. With this in mind, we have attempted to extend the rich structural chemistry of the similar versatile S,N¢-ligands. In the present paper we report the structure of bis(2-pyrimidylthio)methane. In structure of the title compound consists of two pymS units bridged by a methylene group. The two pyrimidyl rings are essentially planar; the dihedral angle between them is 29.6(2)°. Both distances, C(CH 2)-S and C(pym)-S are closer to the average value for a single C-S bond (1.82 Å) than to that of double C=S bonds (1.62 Å), although the lengths of S-pym bonds C1-S1 and C6-S2 (1.762(2) Å and 1.761(1) Å, respectively) suggest a slightly greater bond order than those of the S-methylene bonds C5-S1 and C10-S2 (1.801(1) Å and 1.799(1) Å, respectively). The orientation of the two pym rings places the two N atoms 5.822(3) Å apart. The S···S# distance is 3.077(2) Å. There are weak intermolecular C-H···S hydrogen-bonded contacts (d(C···S) = 3.799(2) Å) which stabilize the crystal packing (bottom figure). The molecules of (pymS) 2CH2 are packed in the crystal with the closest rings of nearest neighbours in the b direction only 4.293(2) Å apart, which is close enough for a very weak p-p interaction Z. Kristallogr. NCS 218 (2003)

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Dinuclear copper(II) complexes incorporating a novel pyrazolo-based ligand with S- and N-rich coordination spheres

Cited by 34 publications

References 39 publications

Di- and tri-organotin(IV) complexes of the new bis(1-methyl-1H-imidazol-2-ylthio)acetate ligand and the decarboxylated analogues

Di- and tri-organotin(IV) complexes of the new bis(1-methyl-1H-imidazol-2-ylthio)acetate ligand and the decarboxylated analogues

Synthesis, X‐ray Crystal Structures, DNA Binding and Nuclease Activities of Two Novel 1,2,4‐Triazole‐Based Cu^II Complexes

Crystal structure of bis(2-pyrimidylthio)methane, C9H8N4S2

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Dinuclear copper(II) complexes incorporating a novel pyrazolo-based ligand with S- and N-rich coordination spheres

Cited by 34 publications

References 39 publications

Di- and tri-organotin(IV) complexes of the new bis(1-methyl-1H-imidazol-2-ylthio)acetate ligand and the decarboxylated analogues

Di- and tri-organotin(IV) complexes of the new bis(1-methyl-1H-imidazol-2-ylthio)acetate ligand and the decarboxylated analogues

Synthesis, X‐ray Crystal Structures, DNA Binding and Nuclease Activities of Two Novel 1,2,4‐Triazole‐Based CuII Complexes

Crystal structure of bis(2-pyrimidylthio)methane, C9H8N4S2

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Synthesis, X‐ray Crystal Structures, DNA Binding and Nuclease Activities of Two Novel 1,2,4‐Triazole‐Based Cu^II Complexes