The structure of β-Mn crystallizes in space group P4132. The pseudo 8-fold nature of the 41 axes makes it constitute an approximant to the octagonal quasicrystals. In this paper we analyze why a five-dimensional super space group containing mutually perpendicular 8-fold axes cannot generate P4132 on projection to 3-d space and how this may instead be accomplished from a six-dimensional model. A...

This research work was focused on green synthesis of silver nanoparticles (Ag-NPs) employing an aqueous plant extract Ifloga spicata. The used in the nanoparticle served as a stabilizing and reducing agent. were characterized via various techniques such X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, UV-visible spectroscopy...

The unit cell of the title compound, [Mn(2)(C(2)O(4))(C(10)H(8)N(2))(4)](ClO(4))(2)·C(10)H(8)N(2), consists of a binuclear cation, two perchlor-ate anions, and one solvent 2,2'-bipyridine (bpy) mol-ecule. In the complex cation [Mn(2)(C(2)O(4))(C(10)N(2)H(8))(4)](2+), two Mn(II) atoms are bridged by a bis-(bidentate) oxalate ligand, each Mn(II) atom being further coordinated by two bpy ligands i...

In the title compound, {[Mn(C(8)H(4)O(4))(C(10)H(8)N(2))(H(2)O)]·H(2)O}(n), the Mn(II) centre is octa-hedrally coordinated by three O atoms from two 5-methoxy-isophthalate (CH(3)O-ip) ligands, a fourth from a coordinated water mol-ecule and two N atoms from one chelating 2,2'-bipyridine (2,2-bipy) ligand. Each pair of adjacent Mn(II) atoms is bridged by a CH(3)O-ip ligand, forming a helical cha...

Two novel Mn(II) coordination polymers with azide and 4-(4-pyridyl)benzoic acid N-oxide (4,4-Hopybz) were synthesized and structurally and magnetically characterized. They are formulated as {[Mn(2)(4,4-opybz)(2)(N(3))(2)(H(2)O)(2)]·H(2)O}(n) (1) and {[Mn(4)(4,4-opybz)(5)(N(3))(H(2)O)(8)](N(3))(2)·2H(2)O}(n) (2). Compound 1 contains 2D coordination layers in which the infinite Mn(II) chains with...

In the title coordination polymer, [Mn(C(8)H(5)NO(5))(H(2)O)(4)](n), the Mn(II) atom is coordinated by two carboxyl-ate O atoms from two 5-carboxyl-ato-1-carboxyl-atomethyl-2-oxidopyridinium (L(2-)) ligands and by four water mol-ecules in a distorted octa-hedral geometry. The L(2-) ligands bridge the Mn atoms into an infinite chain motif along [100]; the chains are further inter-linked by O-H⋯O...

Although manganese (Mn) is an essential nutrient, toxicity has been demonstrated in workers accidentally exposed to large amounts. Chronic exposure to Mn can damage the nervous system and respiratory tract and result in symptoms similar to Parkinson disease. to Mn are more likely to develop Parkinson disease than the rest of the population, especially at an early age.5 Mn has been shown to inte...

The synthesis of the polyaromatic aldehyde 1-hydroxybenz[a]anthracene-2-carboxaldehyde is reported via a seven step protocol from 9,10-dihydroanthracene, with an overall yield of 30%. Two equivalents of the aldehyde are condensed with (R)-1,1'-binaphthyl-2,2'-diamine to produce a new binaphthyl-salen ligand, which is subsequently complexed to iron(II) and zinc(II) ions. The ligand and complexes...

ROBERT GULLIVER ABSTRACT. Let be a two-dimensional immersed minimal surface in a manifold Mn, having a curve as boundary. We do not assume that has minimum area. It will be shown that the number of sheets of passing through a point p 2 M (the density of at p) will be bounded by geometric measures of the complexity of . However, such an estimate must also depend on the geometry of the ambient ma...

A dinuclear manganese(III) complex (1) of an N-(carboxymethyl)-N-[3,5-bis(α,α-dimethylbenzyl-2-hydroxybenzyl)]glycine (HDA) ligand (L) binds a manganese(II) species through displacement of its solvating ligands by appropriately dispositioned carbonyl groups of a dinuclear complex {[Mn(2)(L)(2)(OH)(OCH(3))][Mn(H(2)O)(3)(CH(3)OH)(3)], 2, triclinic P1, a = 13.172(3) Å, b = 15.897(3) Å, c = 19.059(...