Synthesis and characterisation of some ruthenium(II) complexes of α-N heterocyclic carboxylic acids—X-ray structures of cis-[Ru(PPh3)2(L1)2]·2CH3OH and cis-[Ru(PPh3)2(L3H)2] (L1H=pyridine 2-carboxylic acid and L3H2=imidazole 4,5-dicarboxylic acid)

Synthesis of Novel Pyridyl-Based Schiff Base and Its Coordination Behaviour with Ruthenium(II) and Zinc(II)

“…The ruthenium(II) complexes reported previously through the reaction of cis-[Ru(bpy)2Cl2] with (1-Methyl-1H-imidazol-2-yl)-pyridin-2-yl ketone as the ligand underwent an oxidation reaction before the coordination [27]. Ruthenium(II) complexes with carboxylate ligands are of interest because of their electrochemical and spectroscopic behaviour [28,29]. Zinc(II) can be coordinated to the pyridine-2-Schiff base moiety because of it is smaller ion radius compared to ruthenium and the absence of co-ligands which contributes to the stericdemand in the ruthenium center.…”

Ruthenium (II) phosphine/picolinate complexes as antimycobacterial agents

“…In the free Hpic spectrum, the n as (C-O) and n s (C-O) bands appear in the 1700-1730 cm À1 region. The presence of the PF 6 À counter-ion is seen in bands at 840 and 557 cm À1 [17,18]. The electronic spectra of complexes (1) and (2) show two bands in the UV region, one attributed to intra-ligand transitions (p / p*) by comparing with the UV spectra of free ligands (dppm, dppe and Hpic), and other corresponding to metal to ligand charge transfer transition (MLCT).…”

“…Complex (3) shows an additional shoulder near to 300 nm. Table 1 contains the electronic spectra data for all the complexes [17].…”

“…The solids were filtered off and washed well with water (3 Â 5 mL) and diethyl ether (3 Â 5 mL) and dried in vacuo. The [Ru(pic) 2 (PPh 3 ) 2 ] (3) complex was synthesized by a modification of the literature procedure [17]. Excess picolinic acid (0.300 mmol; 36.9 mg) was added to a suspension of [RuCl 2 (PPh 3 ) 3 ] (0.104 mmol; 100 mg) in methanol, under an atmosphere of Ar, and the mixture was refluxed for 48 h. The final solution was concentrated to ca.…”

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

“…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].…”