Synthesis, characterization and cyclic voltammetric studies of monopicolinate complexes of ruthenium(II)

Ghatak, Natun; Chakravarty, Joydip; Bhattacharya, Samaresh

doi:10.1007/bf00167015

Cited by 14 publications

(2 citation statements)

References 13 publications

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“…The mer-[Cr(pic) 3 ] isomer is widely applied as a synthetic source of biochromium [1][2][3], whereas its vanadium and ruthenium analogs are examined as potential diabetic and anticancer drugs, respectively [4]. At the turn of the twentieth century, several tris-, bis-, and monopicolinato complexes of ruthenium (II)/(III) have been synthesized and characterized [5][6][7][8][9][10][11][12][13][14][15]. They are attractive objects of study either as potential pharmaceuticals or as effective and selective stoichiometric or/and catalytic reagents toward oxidation of a variety of organic and inorganic substrates [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Base hydrolysis of mer-trispicolinatoruthenium(III): kinetics and mechanism

Impert

Katafias

Kita

et al. 2011

Transition Met Chem

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The mer-[Ru(pic) 3 ] isomer, where pic is 2-pyridinecarboxylic acid, undergoes base hydrolysis at pH [ 12. The reaction was monitored spectrophotometrically within the UV-Vis spectral range. The product of the reaction, the [Ru(pic) 2 (OH) 2 ] -ion, is formed via a consecutive two-stage process. The chelate ring opening is proceeded by the nucleophilic attack of OH -ion at the carbon atom of the carboxylic group and the deprotonation of the attached hydroxo group. In the second stage, the fast deprotonation of the coordinated OH -ligand leads to liberation of the monodentato bonded picolinate. The dependence of the observed pseudo-first-order rate constant on [OH -] is given by k obs1 ¼ k þ k 1 ½OH À þk þ k 2 K 1 ½OH À 2 k À þk 1 þ k þ þk 2 K 1 ð Þ ½ OH À þk þ K 1 ½OH À 2 and k obs2 ¼ k ca þk cb K 2 ½OH À 1þK 2 ½OH À for the first and the second stage, respectively, where k 1 , k 2 , k -, k ca , k cb are the first-order rate constants and k ? is the second-order one, K 1 and K 2 are the protolytic equilibria constants.

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Section: Introductionmentioning

confidence: 99%

Base hydrolysis of mer-trispicolinatoruthenium(III): kinetics and mechanism

Impert

Katafias

Kita

et al. 2011

Transition Met Chem

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“…This behavior can be explained because picolinate is a better σ-donor and π-acceptor ligand than the chlorido ligands, which acts as σand π-donor. When the π-acceptor character of the ligand decreases, it is expected that the value of E pa also decreases, such as observed for the complexes [Ru(bipy) 3 ] 2+ (E pa = 1300 mV), 46 [Ru(pic)(bipy) 2 ] + (E pa = 750 mV), 47 [Ru(pic) 2 (bipy)] (E pa = 440 mV) and [Ru(pic) 3 ] (E pa = −90 mV). 48 From these data, it can be concluded that the π-acceptor character of the picolinate ligand is weaker than that of the bipy ligand.…”

Section: Structural Studiesmentioning

confidence: 93%

New Heteroleptic RuII/Diphosphine Complexes with Cytotoxicity against Human Breast and Murine Ascitic Sarcoma 180 Tumor Cells

Lima¹,

Corrêa²,

Graminha³

et al. 2020

J. Braz. Chem. Soc.

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The preparation, characterization, theoretical calculations and biological application of four Ru II complexes with 2-picolinate (pic), 2,2'-bipyridine (bipy) and P-P as ligands [P-P = 1,1-bis(diphenylphosphino)methane (dppm-1), 1,2-bis(diphenylphosphino)ethane (dppe-2), 1,3-bis(diphenylphosphino)propane (dppp-3) or 1,1'-bis(diphenylphosphino)ferrocene (dppf-4)], is here presented. The complexes 1-4, with general formula [Ru(pic)(P-P)(bipy)]PF 6 , were characterized by elemental analysis and by infrared (IR), UV-Vis, nuclear magnetic resonance (NMR 1 H and 13 P{ 1 H}) spectroscopies, cyclic voltammetry and X-ray crystallography technique. Additionally, preliminary in vitro tests against human breast (MDA-MB-231) and murine ascitic sarcoma 180 (S180) tumor cell lines were carried out, and compared with cisplatin, a reference drug. The drug concentration at which 50% of the cells are viable relative to the control (IC 50) values found for complexes 1, 2, 3 and 4 against MDA-MB-231 tumor cells were around 14.6, 7.6, 3.3 and 0.4 μM, respectively, while against S180 tumor cells these complexes showed IC 50 values of 71.9, 31.3, 11.2 and 3.5 μM, respectively. Therefore, the complexes were more active against MDA-MB-231 than S180.

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Synthesis, Electrochemistry, and Photophysical Studies of Ruthenium(II) Polypyridine Complexes with D–π–A–π–D Type Ligands and Their Application Studies as Organic Memories

Leung

et al. 2016

Chemistry A European J

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A new class of ruthenium(II) polypyridine complexes with a series of D-π-A-π-D type (D=donor, A=acceptor) ligands was synthesized and characterized by H NMR spectroscopy, mass spectrometry, and elemental analysis. The photophysical and electrochemical properties of the complexes were also investigated. The newly synthesized ruthenium(II) polypyridine complexes were found to exhibit two intense absorption bands at both high-energy (λ=333-369 nm) and low-energy (λ=520-535 nm) regions. They are assigned as intraligand (IL) π→π* transitions of the bipyridine (bpy) and π-conjugated bpy ligands, and IL charge-transfer (CT) transitions from the donor to the acceptor moiety with mixing of dπ(Ru )→π*(bpy) and dπ(Ru )→π*(L) MLCT characters, respectively. In addition, all complexes were demonstrated to exhibit intense red emissions at approximately λ=727-744 nm in degassed dichloromethane at 298 K or in n-butyronitrile glass at 77 K. Nanosecond transient absorption (TA) spectroscopy has also been carried out, establishing the presence of the charge-separated state. In order to understand the electrochemical properties of the complexes, cyclic voltammetry has also been performed. Two quasi-reversible oxidation couples and three quasi-reversible reduction couples were observed. One of the ruthenium(II) complexes has been utilized in the fabrication of memory devices, in which an ON/OFF current ratio of over 10 was obtained.

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Synthesis, characterization and cyclic voltammetric studies of monopicolinate complexes of ruthenium(II)

Cited by 14 publications

References 13 publications

Base hydrolysis of mer-trispicolinatoruthenium(III): kinetics and mechanism

Base hydrolysis of mer-trispicolinatoruthenium(III): kinetics and mechanism

New Heteroleptic RuII/Diphosphine Complexes with Cytotoxicity against Human Breast and Murine Ascitic Sarcoma 180 Tumor Cells

Synthesis, Electrochemistry, and Photophysical Studies of Ruthenium(II) Polypyridine Complexes with D–π–A–π–D Type Ligands and Their Application Studies as Organic Memories

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