Three new pseudohalide bridged dinuclear Zn(II) Schiff base complexes: Synthesis, crystal structures and fluorescence studies

Basak, Subhra; Sen, Soma; Banerjee, Sambuddha; Mitra, Samiran; Rosair, Georgina M.; Rodriguez, M.

doi:10.1016/j.poly.2007.07.025

Cited by 155 publications

(66 citation statements)

References 29 publications

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Section: Introductionmentioning

confidence: 99%

“…The mononuclear complexes 1 and 2 showed medium broad bands emission at 362 and 385 nm, upon excitation at 323 nm, which mainly arise from intra-ligand mixed with a metalligand charge transfer (MLCT) transitions [28,29]. The decrease in fluorescence intensity the ligand by transition metal ions during complexation might be due to operations such as redox activity, magnetic perturbation and electronic energy transfer [30, 31] (Bagihalli et al, 2008;Basak et al, 2007).The antibacterial activities of the ruthenium(II) complexes were evaluated against three Gram positive bacteria and one Gram-negative bacterium using the microbroth dilution method [32]. The compounds were found to be active against all the strains used with dtdb showing MIC at 1990, 9950, 9950, 7960 µM; complex 1 at 60.4, 60.4, 14.3 and 121 µM while complex 2 at 65.3, 65.3, 15.5 and 261 µM against S. aureus (ATCC 25923), S. epidermis (ATCC 12228), B. cereus (ATCC 10876) and S. typhimurium (ATCC 14028) respectively.…”

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confidence: 99%

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Slow diffusion in situ ruthenium/ligand reaction: Crystal structures, fluorescence and biological properties

Moosun

Jhaumeer‐Laulloo

Coles

et al. 2015

Inorganic Chemistry Communications

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Promoted by RuCl 3 .3H 2 O coordination in the mixed solvent DMF/H 2 O, diverse in situ S-S bond reactions such as S-S bond scission and S-oxidation occurred in the disulfide ligand of 2,2'-dithiodibenzoic acid acid (dtdb) to yield the new sulfinato-benzoate ligand (sb). The X-ray analysis of complexes of [Ru(phen) 2 (sb)] (1) and [Ru(bipy) 2 (sb).H 2 O] (2) revealed that in both complexes, the ruthenium ion was found to be in an octahedral geometry, coordinating to the sulfur atom, rather than the oxygen of sulfinate. The complexes were found to be active against the bacterial strains tested with MIC ranging from 14.3-261 µM. In addition, the metal complexes present strong DNA binding affinities constants in the major or minor grooves at the order of magnitude 10 3 -10 5 M −1 . The antioxidant activities of the ligand and its metal complexes were investigated through scavenging effects for DPPH in vitro, indicating that the compounds show stronger antioxidant activities than some standard antioxidants, such as ascorbic and vitamin C.Keywords: 2,2'-dithiodibenzoic acid, S-oxidation, ruthenium, bacterial strains, DNA binding, antioxidantIn situ metal/disulfide reactions under slow diffusion conditions undergo S-S mediated bond reactions, such as S-oxidation, S-S and C-S bond scission. This is a very important research field in coordination chemistry as it leads to structurally novel coordination architectures with interesting physical properties [1][2][3]. In this respect, the use of organosulfur compounds containing carboxylate groups can be attractive due to their flexibility and versatile coordinating modes of both sulfur and oxygen atoms and, generating unprecedented coordination frameworkswhich can act as linkers between inorganic moieties [4][5][6][7][8]. Up to now, a series of transition metal complexes have been found to react with 2,2'-dithiodibenzoic acid (dtdb), giving rise to 1D chains, 2D sheets or 3D network whereby the carboxylate act as monodentate or bidentate donor with or without cleavage of the S-S bond [9]. Recently, we have isolated new copper(II) coordination polymers, whereby dtdb underwent simultaneous S-S and C-S scission under slow diffusion conditions, leading to the formation of 1D coordination polymers [10]. In the presence of 1,10 phenanthroline (phen) and 2,2'bipyridine (bipy), in addition to extrusion of the sulfur atom, the oxidation of sulfur to a sulfate ion was observed. These observations, coupled with the fact that there are no reports of ruthenium complexes derived from dtdb, stimulated our interest to investigate its coordination behavior. Hence, in this work we report for the first time new coordination polymers obtained from RuCl 3 .3H 2 O and dtdb in the presence of phen and bipy, which exhibit sulfinato-benzoate units. The fluorescent, antioxidant and antibacterial properties of the complexes have also been studied, since ruthenium complexes is considered as an attractive alternative to platinum in anticancer drug design and biological applications [11][12][13]...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Slow diffusion in situ ruthenium/ligand reaction: Crystal structures, fluorescence and biological properties

Moosun

Jhaumeer‐Laulloo

Coles

et al. 2015

Inorganic Chemistry Communications

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“…[28][29][30][31][32][33][34] In contrast, in most of the Cd compounds the cations are linked into coordination polymers by bridging anionic ligands and such compounds show a variety of stoichiometries and topologies of the coordination networks. Compared to Zn II , the synthesis of Cd II compounds with only terminal Nbonded thiocyanate anions is sometimes more difficult.…”

Section: Because Znmentioning

confidence: 99%

Synthesis, Structures, and Physical Properties of Thiocyanate Coordination Compounds with 3‐Hydroxymethylpyridine

Neumann

Cunha

Terraschke

et al. 2017

Zeitschrift anorg allge chemie

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Abstract. The reaction of Cd(NCS) 2 with 3-hydroxymethylpyridine (3-HMPy) leads to the formation of compounds with the composition Cd(NCS) 2 (3-HMPy) 4 (1-Cd),Cd(NCS) 2 (3-HMPy) 2 (2-Cd)(Cd(NCS) 2 ) 2 -(3-HMPy) 3 (3-Cd), and (Cd(NCS) 2 ) 3 (3-HMPy) 4 (4-Cd). Compound 1-Cd consists of discrete complexes and in 2-Cd the Cd cations are linked into chains by the anionic and the organic co-ligands. In 3-Cd as well as 4-Cd the Cd cations are connected into chains by the thiocyanate anions, which are further linked into layers by the 3-HMPy coligands. In contrast, with Zn only one compound with the composition Zn(NCS) 2 (3-HMPy) 2 ·H 2 O (1-Zn-H 2 O) was characterized by single-

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“…In the octahedral coordination, Zn-O and Zn-N distances are comparable to those observed in other zinc(II) complexes with Schiff bases. 20 In the crystal structure of the complex, the zinc complex molecules are linked through intermolecular N-H···N hydrogen bonds, to form 1D chains running along the c axis (Figure 4). …”

Section: Materials and Measurementsmentioning

confidence: 99%

Synthesis, Crystal Structures and Preliminary Antibacterial Activities of Nickel(ii) and Zinc(ii) Complexes Derived From 2-Bromo-6-[(3-Cyclohexylaminopropylimino) Methyl]phenol

Ding

Cheng

et al. 2015

J. Chil. Chem. Soc.

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Three new pseudohalide bridged dinuclear Zn(II) Schiff base complexes: Synthesis, crystal structures and fluorescence studies

Cited by 155 publications

References 29 publications

Slow diffusion in situ ruthenium/ligand reaction: Crystal structures, fluorescence and biological properties

Slow diffusion in situ ruthenium/ligand reaction: Crystal structures, fluorescence and biological properties

Synthesis, Structures, and Physical Properties of Thiocyanate Coordination Compounds with 3‐Hydroxymethylpyridine

Synthesis, Crystal Structures and Preliminary Antibacterial Activities of Nickel(ii) and Zinc(ii) Complexes Derived From 2-Bromo-6-[(3-Cyclohexylaminopropylimino) Methyl]phenol

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