Cyanines during the 1990s: A Review

Anti-cancer drugs

On the medicinal chemistry of gold complexes as anticancer drugs

Flipping the light switch 'on'--the design of sensor molecules that show cation-induced fluorescence enhancement with heavy and transition metal ions.

The coordination chemistry of guanidines and guanidinates

The complexation of carboxylic acid Monensin A (MonH, 1a) with CoCl2.6H2O and MnCl2.4H2O leads to the formation of mononuclear complexes [Co(Mon)2(H2O)2], 2a and [Mn(Mon)2(H2O)2], 2b, respectively. The unique crystal structures of 2a and 2b were determined by X-ray crystallography. The complexes crystallize in the monoclinic space group P21 with an octahedrally coordinated transition metal center forming the crystallographically centrosymmetric chromophore CoO6 or MnO6, respectively. Two molecules of Monensin A act bidentately through their carboxylate moiety and a hydroxyl group, and two water molecules are additionally transcoordinated. Although the transition metal ions are not bound into the cavity of the ligand, the unusual bidentate coordination mode of the ionophore induces its “pseudo-cyclization” forming 22-membered cycles further stabilized by a number of H-bonds. The complexes are the first example of divalent metal complexes of the monovalent polyether ionophore. The parallel study on the complexation ability of the potassium complex of Monensin A (MonK, 1b) towards Co(II) and Mn(II) showed the formation of the isostructural complexes 2a and 2b accompanied by loss of the potassium ion due to the new coordination mode of the ligand. The biological tests performed with the antibiotic MonH and the corresponding metal(II) complexes show greatly enhanced antimicrobial activity of complexes 2a-b against Gram(+)-bacteria.

First divalent metal complexes of the polyether ionophore Monensin A: X-Ray structures of [Co(Mon)2(H2O)2] and [Mn(Mon)2(H2O)2] and their bactericidal properties.

Nickel(II) and zinc(II) dimonensinates: Single crystal X-ray structure, spectral properties and bactericidal activity

Styryl dyes containing an aza-15-crown-5 macroheterocycle moiety

ESR study on chromium(V) complexes formed in the process of photochemical oxidation of diethylene glycol by dichromate

Reference LCSL-ARTICLE-2004-013View record in Web of Science Record created on 2006-02-15, modified on 2017-05-12

/pdf/cobalt-ii-nickel-ii-copper-ii-and-zinc-ii-complexes-with-a-p-2zjt5tgi7t.pdf

Mariana Mitewa

Papers

First divalent metal complexes of the polyether ionophore Monensin A: X-Ray structures of [Co(Mon)2(H2O)2] and [Mn(Mon)2(H2O)2] and their bactericidal properties.

Nickel(II) and zinc(II) dimonensinates: Single crystal X-ray structure, spectral properties and bactericidal activity

Styryl dyes containing an aza-15-crown-5 macroheterocycle moiety

ESR study on chromium(V) complexes formed in the process of photochemical oxidation of diethylene glycol by dichromate

Cobalt(II), nickel(II), copper(II), and zinc(II) complexes with a p-tert-butylcalix[4]arene fitted with phosphinoyl pendant arms