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Now showing items 2221-2240 of 2767

Simple linear-chain cobalt phosphates

Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 2000)

Two simple one-dimensional cobalt phosphates containing linear chains of corner-shared 4-membered rings have been synthesized hydrothermally by the reaction between amine phosphates and cobalt(II) ions under non-aqueous ...
Fascinating Alkali Halide Structures Of Different Dimensionalities Incorporated In Host Lattices

Vaidhyanathan, R; Neeraj, S; Prasad, P A; Natarajan, Srinivasan; Rao, C N R (WILEY-VCH Verlag GmbH, 2000)

A cadmium oxalate lattice functions as a host for extended alkali halide structures with different dimensionalities. The picture shows one example in which the Cl− ions of a three-dimensional KCl lattice are located in a ...
An Unusual Open-Framework Cobalt(Ii) Phosphate With A Channel Structure That Exhibits Structural And Magnetic Transitions

Choudhury, Amitava; Neeraj, S; Natarajan, Srinivasan; Rao, C N R (WILEY-VCH Verlag GmbH, 2000)

An Unusual Open-Framework Cobalt(II) Phosphate with a Channel Structure That Exhibits Structural and Magnetic Transitions
Synthesis and structure of the first open-framework cadmium oxalate possessing channels

Prasad, P A; Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 2000)

A three-dimensional open-framework cadmium oxalate, K[C3N2H5][Cd(C2O4)(2)], in which both the amine and the K+ ion participate in the formation of the structure, has been synthesized and characterized for the first time.
Zn4O4 tetrameric clusters in a zinc phosphate with channels

Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 2000)

Zn4O4 tetrameric clusters, found for the first time in an open-framework phosphate form basket-shaped building units, in combination with PO4 tetrahedra give rise to a one-dimensional channel structure.
Solution-mediated synthesis of a three-dimensional zinc phosphate in the presence of a monoamine

Ayi, Ayi A; Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 2000)

A new open-framework zinc phosphate of the formula [C2H5NH3](2)[Zn-2(HPO4)(3)], I, has been synthesized at 60 degreesC in a THF-water medium in the presence of ethylamine. The structure consists of a network of strictly ...
An Experimental Charge Density Study of the Effect of the Noncentric Crystal Field on the Molecular Properties of Organic NLO Materials

Gopalan, R Srinivasa; Kulkarni, G U; Rao, C N R (WILEY-VCH Verlag GmbH, 2000-11-03)

The structure, packing, and charge distribution in molecules of nonlinear optical materials have been analysed with reference to their counterparts in centrosymmetric structures based on low temperature X-ray measurements. ...
An experimental charge density study of aliphatic dicarboxylic acids

Gopalan, R Srinivasa; Kumaradhas, P; Kulkarni, G U; Rao, C N R (Elsevier Science BV, 2000-03-28)

By employing reliable structural data on malonic, succinic, glutaric, adipic and pimelic acids, obtained by a single crystal Xray crystallographic study of these systems (using a CCD detector), the total electron densities ...
A novel hybrid layer compound containing silver sheets and an organic spacer

Rao, C N R; Ranganathan, Anupama; Pedireddi, V R; Raju, A R (Royal Society of Chemistry, 2000)

A novel compound of the formula Ag-2. CA (CA = cyanuric acid) possessing Ag sheets and hydrogen-bonded CA chains, exhibits anisotropic conductivity and acts as an infinite parallel plate capacitor with a high dielectric constant.
Formation of One-, Two-, and Three-Dimensional Open-Framework Zinc Phosphates in the Presence of a Tetramine

Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (American Chemical Society, 2000-09-18)

Five new open-framework zinc phosphates, encompassing the entire hierarchy of open-framework structures, have been synthesized hydrothermally in the presence of triethylenetetramine. The structures include one-dimensional ...
Experimental and theoretical electronic charge densities in molecular crystals

Kulkarni, G U; Gopalan, R S; Rao, C N R (Elsevier Science BV, 2000-04-03)

Electronic charge density distribution in molecular systems has been described in terms of the topological properties. After briefly reviewing methods of obtaining charge densities from X-ray diffraction and theory, typical ...
Metal nanoparticles, nanowires, and carbon nanotubes

Rao, C N R; Kulkarni, G U; Govindaraj, A; Satishkumar, B C; Thomas, P John (International Union Pure Applied Chemistry, 2000-01)

The size-dependent metal to nonmetal transition in metal nanoparticles has been investigated using photoelectron and tunneling spectroscopic techniques. Metal nanoparticles capped by thiols are shown to organize into ordered ...
Analysis of circadian locomotor rhythms in vg and cry b mutants of Drosophila melanogaster under different light:dark regimens

Sivaperumal, R; Subramanian, P; Yadav, Pankaj; Sharma, Vijay Kumar (Taylor & Francis Ltd, 2011-08)

The fruit fly (Drosophila melanogaster) offers an extremely useful system to study circadian clock function at the behavioral, molecular, cellular, and organismal levels. We reared wild type (Oregon R+) and mutant flies – ...
Metal nanoparticles and their assemblies

Rao, C N R; Kulkarni, G U; Thomas, P John; Edwards, Peter P (Royal Society of Chemistry, 2000-01)

Metal nanoparticles of varying sizes can be prepared by physical as well as chemical methods. They exhibit many fascinating properties, the size-dependent metal to nonmetal transition being an important one. Metal nanoparticles ...
Interaction of carbon monoxide with Cu-Pd and Cu-Ni bimetallic clusters

Vinod, C P; Harikumar, K R; Kulkarni, G U; Rao, C N R (Baltzer Science Publishers BV, 2000)

Interaction of CO with Cu-Pd and Cu-Ni bimetallic clusters deposited on a ZnO substrate has been investigated by core-level spectroscopy. The surface reactivity of both these alloy clusters increases with the decrease in ...
Short- and Long-day Responses in the Pre-adult Developmental Duration of Two Species of Camponotus Ants

Lone, Shahnaz Rahman; Ilangovan, Vinodh; Murugan, Madhuvika; Sharma, Vijay Kumar (Informa Healthcare, 2011)

We assessed the effect of different day/night lengths on the pre-adult developmental time of two species of Camponotus ants that normally develop in dark underground nests. We assayed larval (egg-to-pupal formation), pupal ...
An indigenous cluster beam apparatus with a reflectron time-of-flight mass spectrometer

Raina, G; Kulkarni, G U; Yadav, R T; Ramamurthy, V S; Rao, C N R (Indian Academy of Sciences, 2000-04)

The design and fabrication of a Smalley-type cluster source in combination with a reflectron based time-of-flight (TOF) mass spectrometer are reported. The generation of clusters is based on supersonic jet expansion of ...
Effect of size on the Coulomb staircase phenomenon in metal nanocrystals

Thomas, P John; Kulkarni, G U; Rao, C N R (Elsevier Science BV, 2000-04-21)

The Coulomb staircase in polymer-covered Pd and Au nanocrystals of varying diameters in the 1.7-6.4 nm has been investigated by employing tunneling conductance measurements. Charging up to several electrons is observed at ...
An Investigation of Two-Dimensional Arrays of Thiolized Pd Nanocrystals

Thomas, P John; Kulkarni, G U; Rao, C N R (American Chemical Society, 2000-08-31)

Two-dimensional arrays of Pd nanocrystals of varying diameters (1.8-6.0 nm) have been obtained after thiolization with alkane thiols of different chain lengths (C-4-C-16) The stability and structure of these arrays have ...
Nanotubes and nanowires

Rao, C N R; Govindaraj, A (Indian Academy of Sciences, 2001-09)

Synthesis and characterization of nanotubes and nanowires constitute an important part of nanoscience since these materials are essential building units for several devices. We have prepared aligned carbon nanotube bundles ...

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