Prof. C.N.R. Rao's Publications: Recent submissions

Now showing items 281-300 of 892

An organically templated open-framework cadmium selenite

Pasha, Intyaj; Choudhury, Amitava; Rao, C N R (Editions Scientifiques Medicales Elsevier, 2003-01)

An open-framework cadmium selenite of the composition [CdCl2(HSeO3)2](enH2) has been obtained by a solution-mediated reaction. This compound crystallizes in a monoclinic unit cell with the space group P21/c (No. 14) and ...
The first organically templated linear metal selenate

Pasha, Intyaj; Choudhury, Amitava; Rao, C N R (Academic Press Inc Elsevier Science, 2003-09)

An organically templated cadmium selenate of the formula [enH(2)][Cd(H2O)(2)(SeO4)(2)] I has been synthesized by carrying out the reaction between CdO and H2SeO4 in the presence of the amine in aqueous medium at 80degreesC. ...
Amine-templated metal squarates

Dan, Meenakshi; Sivashankar, K; Cheetham, A K; Rao, C N R (Academic Press Inc Elsevier Science, 2003-08)

Two layered amine-templated cobalt squarates, [C6N2H14](2)[Co-2(C4O4)(3)(H2O)(4)], I, and [C3N2H5](2)[CO2(C4O4)(3)(H2O)(4)], II, have been prepared under hydrothermal conditions. Both I and II contain chains formed by ...
Occurrence of re-entrant ferromagnetic transitions in rare-earth manganates on cooling the charge-ordered states

Kundu, Asish K; Vanitha, P V; Rao, C N R (Pergamon-Elsevier Science Ltd, 2003)

Some of the compositions of the half-doped rare-earth manganates, La0.5−xLnxCa0.5MnO3 (Ln=Nd, Pr) and Nd0.5Ca0.5−xSrxMnO3 with relatively small A-cation radii, 〈rA〉, show an unusual behavior wherein they become ferromagnetic ...
Probing the hydrogen bond through experimental charge densities

Ranganathan, Anupama; Kulkarni, G U; Rao, C N R (Elsevier Science BV, 2003-08-27)

Experimental charge density analysis has been carried out by using low-temperature X-ray diffraction data on molecular crystals exhibiting a variety of hydrogen bond interactions. The various types of hydrogen-bonded ...
Open-Framework Rubidium Halides Incorporated in Cadmium Oxalate Host Lattices

Vaidhyanathan, R; Natarajan, Srinivasan; Rao, C N R (Academic Press Inc Elsevier Science, 2002-08)

The metathetic reaction between CdBr2 and rubidium oxalate under hydrothermal conditions yields [RbBr] [Cd6(C2O4)(6)]. 2H(2)O, I, containing Cd6O24 clusters with the Br- ions in the center. The RbBr moiety forms a ...
Hydrogen bonded structures in organic amine oxalates

Vaidhyanathan, R; Natarajan, S; Rao, C N R (Elsevier Science BV, 2002-05-22)

Oxalates of n-propylamine, n-butylamine, ethylenediamine, 1,4-butanediamine, piperazine, guanidine and 1,4-diazabicyclo[2,2,2]octane (DABCO) have been synthesized and characterized by single crystal X-ray diffraction and ...
Preparation and characterization of oriented III-V nitride thin films by nebulized spray pyrolysis

Raju, A R; Sardar, Kripasindhu; Rao, C N R (Elsevier Science Ltd, 2002-12)

Thin films of GaN, InGaN, AlGaN and AlN on Si(1 0 0) as well as on Al2O3(0 0 0 1) single crystalline substrates have been deposited at 1123, 1023, 1173 and 1173 K, respectively, by employing the simple inexpensive technique ...
Open-Framework Zinc Phosphates Synthesized in the Presence of Structure-Directing Organic Amines

Chidambaram, Devicharan; Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Academic Press Inc, 1999-09)

Four open-framework zinc phosphates have been synthesized in the presence of structure-directing organic amines. Crystal data: compound I, [NH3(CH2)2NH3·Zn2(HPO4)2(H2PO4)2], monoclinic, space group=P21/c (No. 14), a=16.420(2) ...
A simple method of hydrogen insertion in transition metal oxides to obtain bronzes

Ayyappan, S; Rao, C N R (Pergamon-Elsevier Science Ltd, 1995-08)

Reaction of WO3, MoO3 and V2O5 with alcohols or glycols is shown to yield hydrogen bronzes of the oxides. Cubic and tetragonal HxWO3, H0.47 MoO3 as well as H0.4V2O5 have been prepared by this method.
Preface - Theoretical chemistry in India

Thomas, W J Orville; Rao, C N R (Elsevier Science BV, 1996)
Materials science - Charge Ordering In Manganates

Rao, C N R; Cheetham, A K (American Association for the Advancement of Science, 1997-05-09)

Several compounds are known to exhibit magnetoresistance, a change in electrical resistivity in the presence of magnetic field. Such materials are of interest both for technology and basic science. In their Perspective, ...
Dependence of the polarizability of the Cu4O8 cluster on the doping, the weight of the oxygen-hole state, and the excitation gaps in the three-band Hubbard model

Ramasesha, S; Rao, C N R (American Physical Society, 1991-10-01)

We have obtained the model exact static polarizability of the Cu4O8 cluster within the three-band Hubbard model for different doping levels. The excitation gaps as well as the weight of the O- (oxygen-hole) state in the ...
An investigation of the hydrogenation of aromatic hydrocarbons to yield saturated cycloalkanes: relevance to graphite-diamond transformation

Sen, Rahul; Sumathy, R; Rao, C N R (Elsevier Science BV, 1996)

Step-wise hydrogenation of benzene, naphthalene and pyrene to yield the corresponding saturated derivatives has been examined at the AM1/RHF level in order to understand the graphite-diamond conversion in a hydrogen plasma. ...
Structures And Images Of Novel Derivatives Of Carbon Nanotubes, Fullerenes And Related New Carbon Forms

Sen, Rahul; Satishkumar, B C; Raina, Gargi; Rao, C N R (Marcel Dekker Inc, 1997)

In the light of the finding that carbon nanotubes get functionalized on reaction with acid and other oxidizing agents the structures and shapes of nanotube derivatives resulting front possible reaction between functionalized ...
Hopping conduction in charge-ordered rare-earth manganates Ln(1-x)Ca(x)MnO(3) (Ln = rare earth)

Sarathy, K Vijaya; Parashar, S; Raju, A R; Rao, C N R (Editions Scientifiques Medicales Elsevier, 2002-03)

Electrical resistivity behavior of single crystals as well as polycrystalline pellets of rare earth manganates has been investigated below the charge-ordering temperatures to understand the mechanism of conduction. The ...
Metal-Filled and Hollow Carbon Nanotubes Obtained by the Decomposition of Metal-Containing Free Precursor Molecules

Sen, Rahul; Govindaraj, A; Rao, C N R (American Chemical Society, 1997-10)

Vapor-phase pyrolysis of Fe(CO)(5) in the presence of another carbon source such as CO or Ca He yields iron-filled or hollow nanotubes depending on the relative concentration of the carbon source. Essentially single-walled ...
Unexpected isomerization of maleic acid to fumaric acid on co-crystallization with 4,4'-bipyridine

Chatterjee, Swati; Pedireddi, V R; Rao, C N R (Pergamon Elsevier Science Ltd, 1998-04-30)

Abstract Co-crystallization of maleic acid, 1, with 4,4′-bipyridine, 2, in acetone, chloroform, ethylacetate and methanol gives a hydrogen bonded 2:1 adduct of 1 with 2 (monoclinic space group, C2/c, a=24.056(8), ...
Grain size effects on charge-ordering, phase segregation and related properties of rare-earth manganates, Nd(0.5)A(0.5)MnO(3) (A=Ca or Sr)

Sudheendra, L; Chinh, H D; Raju, A R; Raychaudhuri, A K; Rao, C N R (Pergamon-Elsevier Science Ltd, 2002)

Grain size has marked effects on charge-ordering and other properties of Nd(0.5)A(0.5)MnO(3) (A=Ca or Sr). Thus, the anti-ferromagnetic (AFM) transition in Nd0.5Ca0.5MnO3 is observed distinctly only in samples sintered at ...
Charge Ordering In Manganates

Rao, C N R; Arulraj, A; Santosh, P N; Cheetham, A K (American Chemical Society, 1998-10)

Ordering of Mn3+ and Mn4+ ions occurs in the rare earth manganates of the general composition Ln1-xAxMnO3 (Ln = rare earth, A = Ca, Sr). Such charge-ordering is associated with antiferromagnetic and insulating properties. ...

Now showing items 281-300 of 892

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