Krishnamoorthy Anbalagan

Chloridobis(ethyl­enediamine-κ2N,N′)(n-pentyl­amine-κN)cobalt(III) dichloride monhydrate

The title complex, [CoCl(C5H13N)(C2H8N2)2]Cl2·H2O, comprises one chloridobis(ethylenediamine)(n-pentylamine)cobalt(III) cation, two chloride counter-anions and a water molecule. The CoIII atom of the complex is hexacoordinated by five N and one Cl atoms. The five N atoms are from two chelating ethylenediamine and one n-pentylamine ligands. Neighbouring cations and anions are connected by N—H⋯Cl and N—H⋯O hydrogen bonds to each other and also to the water molecule.

Facile synthesis of iron oxide coupled and doped titania nanocomposites: tuning of physicochemical and photocatalytic properties

A facile hydrothermal method was firstly employed to synthesize iron oxide coupled and doped titania nanocomposites using an aqueous solution of titanium nitrate. The present nanocomposites exhibit altered compositional, optical, electrical, magnetic and photocatalytic properties with respect to varying dosage of iron in the titania matrix. The architecture of characteristic iron oxide such as Fe2O3 coupled with titania was confirmed by 57Fe Mossbauer spectroscopy and X-ray absorption fine structure spectroscopic measurements. The enhanced photocatalytic activity was demonstrated by comparing with that of pure hematite, anatase TiO2, rutile TiO2 and P25 in the degradation of methylene blue under visible light (λ > 480 nm) irradiation in an aqueous suspension. The strategy presented here gives a promising route towards the development of a metal oxide coupled and doped semiconductor material for applied photocatalysis and related applications.

(Benzyl-amine)chloridobis(ethane-1,2-diamine)cobalt(III) dichloride hemihydrate.

In the title compound, [CoCl(C2H8N2)2(C7H9N)]Cl2·0.5H2O, there are two crystallographically independent cations and anions and one water molecule in the asymmetric unit. Both CoIII ions are bonded to two chelating ethylenediamine ligands, one benzylamine molecule and one chloride ion. The crystal packing is through N—H⋯O, N—H⋯Cl and O—H⋯Cl interactions.

Effects of structural, optical and ferromagnetic states on the photocatalytic activities of Sn–TiO2 nanocrystals

The structural, electronic, magnetic and photocatalytic properties of Sn doped TiO2 diluted magnetic semiconductor nanoparticles (NPs) prepared by a simple hydrothermal method were systematically investigated by various conventional techniques and 119Sn Mossbauer spectroscopy. Anatase, mixed (anatase–rutile) and rutile phases of Sn–TiO2 NPs were obtained by adding different amounts of SnCl4 into a titanium nitrate aqueous solution. Photocatalytic degradation of methyl orange and phenol derivatives (RPhOH) were studied under visible and UV light irradiation in water, respectively. The photocatalytic activities of prepared NPs were found to be drastically related to the structural, optical and ferromagnetic properties. A significant relationship was observed between the Hammett substitution constants of RPhOH and the photocatalytic activity. Among all the samples, the anatase phase with low Sn content performed with the best photocatalytic and ferromagnetic characteristics at room temperature.

Crystal structure of di-chlorido-bis-(4-ethyl-aniline-κN)zinc.

The title compound, [ZnCl2(C8H11N)2], was synthesized by the reaction of zinc dichloride and 4-ethylaniline. The Zn2+ cation is coordinated by two Cl− anions and the N atoms of two 4-ethylaniline ligands, forming a distorted Zn(N2Cl2) tetrahedron. The dihedral angle between the two benzene rings is 85.3 (2)° The Zn atom lies on a twofold rotation axis. The ethyl substituents are disordered over two sets of sites in a 0.74 (2):0.26 (2) ratio. In the crystal, N—H⋯Cl hydrogen bonds link the molecules into sheets perpendicular to the a axis. C—H⋯Cl interactions also occur.

Bis(1,10-phenanthrolin-1-ium) tetra-chlorido-zincate monohydrate.

In the crystal structure of the title compound, (C12H9N2)2[ZnCl4]·H2O, the two independent 1,10-phenanthrolinium cations are bridged by the water molecule and the tetrahedral tetrachloridozincate anion via N—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen bonds, forming chains along [100]. The chains are linked via C—H⋯Cl hydrogen bonds and a number of π–π interactions [centroid–centroid distances vary from 3.5594 (14) to 3.7057 (13) Å], forming a three-dimensional network. In each 1,10-phenanthrolinium cation, there is a short N—H⋯N interaction.

Chloridobis(ethane-1,2-diamine)(4-methyl­aniline)cobalt(III) dichloride monohydrate

In the title compound, [CoCl(C2H8N2)2(C7H9N)]Cl2·H2O, the CoIII ion has a distorted octahedral coordination environment and is surrounded by four N atoms in an equatorial plane, with the other N and Cl atoms occupying the axial positions. The crystal packing is stabilized by N—H⋯O, N—H⋯Cl and O—H⋯Cl interactions.

Influence of Water–Methanol Solvation Assembly and the Key Consequences on the Photo Reduction of CoIII(L)33+(L = (NH3)2, en, pn) Complexes via Ion-Pair Formation

Summary Cobalt(III) complexes of general formulae Co(L)33+, where L refers to (NH3)2, en (1,2-diamino ethane) and pn (1,2-diamino propane) have been subjected to photolysis (excitation wavelength; λ = 254 nm) in water-methanol mixtures (0, 5, 10, 15, 20, 25 and 30% (v/v) methanol). In each mixture as the mole fraction of water surpassed, the observed quantum yield values were triggered. Therefore, ΦCo(II) measured in the binary solvents were subjected to Linear Solvation Energy Relationship (LSER) to model the ΦCo(II) data using the measured empirical solvent parameters in order to break open the solvation effects of excited state reactivities. The photo reduction is solvent dependent; has the form logΦCo(II) = a0 + a1X1 (X1 = xMeOH or εr−1). Effect of solvent polarity in Grunwald–Winstein correlations (r2 = 0.950) is discussed by linear regression analysis incorporating solvent ionizing power (YGW) scale and ΦCo(II) profile. Major causes for these phenomena are investigated in terms of long range solvation effects, in conjunction with short range solvation effects. Distinct border lines between the two are derived from photolysis yields in six solvent mixtures using the results of logΦCo(II) = a0 + a1X1 + a2X2 + … plots, where X1, X2etc. are independent variables (like ETN, DNN, α, β, and π*) representing physicochemical characteristics of solvent. These plots show appreciable correlation of data, which were quantified to unravel solvation effects.

Crystal structure of 2,2'-bi-pyridine-1,1'-diium tetra-chlorido-zincate.

In the crystal structure of the title salt, (C10H10N2)[ZnCl4], the bipyridinediium dication is not planar, with a dihedral angle of 37.21 (9)° between the planes of the two pyridine rings. In the crystal, the slightly distorted [ZnCl4]2− anions are packed into rods parallel to [001], with the organic cations arranged in corrugated layers parallel to (100). Cations and anions are linked through N—H⋯Cl hydrogen bonds, forming chains parallel to [20-1]. Additional C—H⋯Cl interactions consolidate the crystal packing.

Bis(isoquinolin-2-ium) tetra­chlorido­zincate dihydrate

In the title compound, (C9H8N)2[ZnCl4]·2H2O, the tetrachloridozincate ion is located on a twofold rotation axis with the Zn atom on a special position. The crystal packing is stabilized by N—H⋯O and O—H⋯Cl interactions.