Ligand selectivity of tartrate vs nicotinamide in a water-methanol system has been observed the crystallization Mn(II) and Cd(II) complexes. These complexes were crystallized at room temperature by layered solution technique using mixture solvent M(II):tartrate:nicotinamide (M = Mn, Cd) molar ratio 1:1:2. Complexes M(II)-nicotinamide M(II)-tartrate also prepared for data comparison. Analysis cr...

Manganese( III) has been stabili zed in weakly acidic med ium by means of pyrophosphate and the nature of the complex elucidated spectrophotometricall y. Stoichiometry of manganese( JJJ) oxidation of aspirin (acetylsalicylic acid) in pyrophosphate has been establi shed in the pH range 2.3-3.5 by iodometric and spectrophotometric methods. The reac ti on foll ows first order kinetics in [Mn(IIl)j...

Lead(II)-induced cleavage can be used as a tool to probe conformational changes in RNA. In this report, we have investigated the conformation of M1 RNA, the catalytic subunit of Escherichia coli RNase P, by studying the lead(II)-induced cleavage pattern in the presence of various divalent metal ions. Our data suggest that the overall conformation of M1 RNA is very similar in the presence of Mg(...

A general approach for the synthesis of manganese-doped II-VI and III-V nanowires based on metal nanocluster-catalyzed chemical vapor deposition has been developed. High-resolution transmission electron microscopy and energy-dispersive X-ray spectroscopy studies of Mn-doped CdS, ZnS, and GaN nanowires demonstrate that the nanowires are single-crystal structures and homogeneously doped with cont...

The Fe(II) of the binuclear Fe(II)Fe(III) active site of pig purple acid phosphatase (uteroferrin) has been replaced in turn by five M(II) ions (Mn(II), Co(II), Ni(II), Cu(II), and Zn(II)). An uptake of 1 equiv of M(II) is observed in all cases except that of Cu(II), when a second more loosely bound Cu(II) is removed by treatment with edta. The products have been characterized by different anal...

Ca(2+) is an integral component of the Mn(4)O(5)Ca cluster of the oxygen-evolving complex in photosystem II (PS II). Its removal leads to the loss of the water oxidizing functionality. The S(2)' state of the Ca(2+)-depleted cluster from spinach is examined by X- and Q-band EPR and (55)Mn electron nuclear double resonance (ENDOR) spectroscopy. Spectral simulations demonstrate that upon Ca(2+) re...

In the title coordination polymer, [MnCl2(C7H5NS)2] n , the Mn(II) ion is located on the inter-section of a twofold rotation axis and a mirror plane and adopts an octa-hedral coordination geometry defined by two mutually trans N atoms from benzo-thia-zole ligands which occupy the axial positions, and four Cl atoms which form the equatorial sites. The Mn(II) ions are connected by two bridging Cl...

In the title coordination polymer, {[FeMn(C(5)H(5))(C(13)H(7)O(4))(C(10)H(9)N(3))(H(2)O)]·CH(3)OH·H(2)O}(n), the Mn(II) ion has a distorted octa-hedral coordination geometry and is ligated by two N atoms from two di-2-pyridyl-amine mol-ecules, three O atoms from two 5-ferrocenyl-benzene-1,3-dicarboxyl-ate anions and one O atom from a coordinated water mol-ecule. The Mn-O distances range from 2....

By using a neutral inner-salt-type dicarboxylate as coligand, a novel two-dimensional (2D) manganese(II) coordination polymer, [Mn(L)(N(3))]ClO(4) x 1/2 H(2)O (L = 1,3-bis(3-carboxylatopyridinium)propane), was synthesized, and characterized by X-ray crystallography and magnetic measurements. The compound contains uniform Mn(II) chains with simultaneous azide and carboxylate bridges between adja...