Cylindrically Symmetric Inhomogeneous Universes with a Cloud of Strings

Cylindrically symmetric inhomogeneous string cosmological models are investigated in presence of string fluid as a source of matter. To get the three types of exact solutions of Einstein's field equations we assume $A = f(x)k(t)$, $B = g(x)\ell(t)$ and $C = h(x)\ell(t)$. Some physical and geometric aspects of the models are discussed.Comment: 9 page

Bianchi Type III Anisotropic Dark Energy Models with Constant Deceleration Parameter

The Bianchi type III dark energy models with constant deceleration parameter are investigated. The equation of state parameter $\omega$ is found to be time dependent and its existing range for this model is consistent with the recent observations of SN Ia data, SN Ia data (with CMBR anisotropy) and galaxy clustering statistics. The physical aspect of the dark energy models are discussed.Comment: 12 pages, 2 figures, Accepted version of IJT

Metal Chelates as Fungicides: Part IV - Metal(II) Complexes of 4-Chloro-5,6,7,8-tetrahydrobenzothieno[2,3-d]pyrimidine

742- 74

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Reactivity of Tetrabutylammonium Iodide with a Heteronuclear 6Copper(II)–4Na(I) Complex: Selective Recognition of Iodide Ion

A complex of type [Cu6Na4(μ-O)4(NTA)2(bpy)6(H2O)4(NO3)2]·3H2O 1 was allowed to react separately with tetrabutylammonium salts (TBAX), X = F–, Cl–, Br–, I–, AcO–, NO3–, and H2PO4–. The color of complex 1 changed immediately on the addition of TBAI (tetrabutylammonium iodide) only. However, keeping the corresponding solution for 2 months at room temperature, four complexes of compositions [Cu6(μ-OH)4(NTA)2(bpy)6]2I–·5H2O 2, [Cu2(bpy)2(OH)2(I)]2(NO3)2(H2O) 3, [Cu(bpy)2I]I3– 4, and [Cu(bpy)2I]I·TBAI 5 (bpy = 2,2′-bipyridyl, H3NTA = nitrilotriacetic acid) together with some residues of TBAI and complex 1 were isolated in one-pot synthesis. These complexes were characterized using elemental analysis, spectroscopic (IR, UV–vis) and single crystal X-ray diffraction techniques. Colorimetric response of complex 1 with iodide anions was further supported by the changes in its UV–vis spectra recorded in methanol. The results indicated that 1 exhibits a strong affinity for iodide anions