http://nopr.niscair.res.in/handle/123456789/10722 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/10729 Title: 2,7-Dichlorofluorescein, a fluorescent sensor to detect Cd²⁺ over Na⁺, K⁺, Ca²⁺, Cu²⁺, Ni²⁺ and Zn²⁺ <br/> <br/>Authors: Goswami, Priyanka; Baruah, Sukanya; Das, Diganta Kumar <br/> <br/>Abstract: The intensity of the fluorescent emission spectra of 2,7-dichlorofluorescein (510-640 nm) on excitation with 350 nm enhances on interaction with Cd²⁺ ions. Minor enhancement is observed with Na⁺ and Zn²⁺ ions, while no enhancement at all in fluorescence is observed with K⁺, Ca²⁺, Cu²⁺ and Ni²⁺. The enhancement in the fluorescence is explained on the basis of photoinduced electron transfer (PET) mechanism due to the binding of two Cd²⁺ ions to 2,7-dichlorofluorescein (log b = 3.80). <br/> <br/>Page(s): 1617-1620 http://nopr.niscair.res.in/handle/123456789/10728 Title: Molecular interactions in binary mixtures of 2-aminoethanol with 1,4-dioxane and dimethyl sulphoxide investigated by static permittivity measurements <br/> <br/>Authors: Sengwa, R J; Khatri, Vinita; Choudhary, Shobhna <br/> <br/>Abstract: The relative static permittivity (dielectric constant) at 1 MHz and high frequency limit permittivity at wavelength of sodium-D line of the binary mixtures of 2-aminoethanol with 1,4-dioxane or dimethyl sulphoxide over the entire composition range have been investigated at 30 ^oC. The concentration dependent values of excess permittivity and Kirkwood correlation factor of the binary mixtures indicate the formation of hydrogen bonded molecular interactions between these unlike molecules, which modify the dipolar ordering of the self-associated structures of 2-amino­ethanol molecules. 2-Aminoethanol forms 1:1 complexes with dimethyl sulphoxide with increase in number of effective parallel aligned dipoles, while with 1,4-dioxane it forms 2:1 stable adducts, which decrease in number of effective parallel aligned dipoles in their binary mixtures. <br/> <br/>Page(s): 1612-1616 http://nopr.niscair.res.in/handle/123456789/10727 Title: Synthesis and structure of tris (acetylacetonato) aluminum(III) <br/> <br/>Authors: Shirodker, Manisha; Borker, Vrinda; Nather, C; Bensch, W; Rane, K S <br/> <br/>Abstract: Tris(acetylacetonato)aluminium(III), [Al(C₂H₇O₂)₃], a precur-sor in vapor deposition of aluminum oxide, has been prepared starting from industrial alum, Al₂(SO₄)₃.16H₂O and characterized by chemical, IR, thermal (TG-DSC) and single crystal X-ray diffraction analyses. The compound crystallizes in the monoclinic space group P2₁/c<i></i>and all atoms are located in general positions. The central metal is hexacoordinated to three bidentate acetylacetonate ligands. <br/> <br/>Page(s): 1607-1611 http://nopr.niscair.res.in/handle/123456789/10726 Title: Synthesis and characterization of a new nickel(II) mixed ligand complex with 2-(2'-pyridyl) benzothiazole <br/> <br/>Authors: Patel, R N; Singh, Anurag; Shukla, K K; Patel, Dinesh K; Sondhiya, V P <br/> <br/>Abstract: A new complex, [Ni(L¹)(L²)(H₂O)]ClO₄, (L¹ = 2-(2′-pyridyl)- benzothiazole), L² = N-[(1)-pyridin-2-ylmethylidene] benzo-hydrazone), has been synthesized and characterized by various physico-chemical techniques. The nickel atom is coordinated in a distorted octahedral geometry. The metal center is coordinated through azomethine nitrogen, pyridine nitrogens, carbonyl oxygen and one nitrogen atom of L¹. Additionally, the pyridyl planes in complex are engaged in intra- and intermolecular hydrogen bonding interactions <br/> <br/>Page(s): 1601-1606