Research Papers (Prof. C.N.R. Rao): Recent submissions

Now showing items 501-520 of 877

Graphene analogues of layered metal selenides

Matte, H S S Ramakrishna; Plowman, Blake; Datta, Ranjan; Rao, C N R (Royal Society of Chemistry, 2011)

Graphene analogues of MoSe(2) and WSe(2) have been prepared by three different chemical methods and characterized by electron microscopy and other methods. Graphene analogues of these diselenides as well as of GaSe have ...
Synthesis of hexagonal microporous silica and aluminophosphate by supramolecular templating of a short-chain amine

Eswaramoorthy, M; Neeraj, S; Rao, C N R (Elsevier Science BV, 1999-03)

Hexagonal microporous phases of SiO2 and AlPO4 with pore sizes in the range intermediate between traditional microporous and mesoporous materials have been prepared, by making use of supramolecular organization of short-chain ...
A Comparative Study of Water- and Benzene-Saturated Mesoporous Silicas by 1H NMR Spectroscopy

Ayyappan, S; Suryaprakash, N; Ramanathan, K V; Rao, C N R (Kluwer Academic Publishers, 1999-01)

H-1 NMR investigations have been carried out ion water- and benzene-saturated mesoporous sillicas with a wide range of pore sizes (13-42 Angstrom). The freezing point of the bound water increases with the pore size, ...
Porous materials: A case study of supramolecular organization in materials design

Rao, C N R (Indian Academy of Sciences, 1999-05)

Supramolecular synthesis is being increasingly employed in materials design. In this article, the design of porous solids is discussed as a case study. Examples from recent work in the areas of open-framework inorganic ...
Amine-Templated Cobalt(II) Coordination Polymer Exhibiting Novel Magnetic Properties: Effect of Dehydration

Nagaraja, C M; Kumar, Nitesh; Maji, Tapas Kumar; Rao, C N R (Wiley-Blackwell, 2011-05)

An amine-templated 2D coordination polymer of Co(II) with the formula {[EDAH(2)][Co(2)F(2)(SO(4))(2)(H(2)O)(2)]}(n) (1) (EDA = ethylenediamine), has been synthesised and structurally characterised. It consists of a 1D chain ...
Quenching of fluorescence of aromatic molecules by graphene due to electron transfer

Matte, H S S Ramakrishna; Subrahmanyam, K S; Rao, K Venkata; George, Subi J; Rao, C N R (Elsevier Science B V, 2011-04-20)

Investigations on the fluorescence quenching of graphene have been carried out with two organic donor molecules, pyrene butanaoic acid succinimidyl ester (PyBS, I) and oligo(p-phenylenevinylene) methyl ester (OPV-ester, ...
Temperature effects on the Raman spectra of graphenes: dependence on the number of layers and doping

Late, Dattatray J; Maitra, Urmimala; Panchakarla, L S; Waghmare, Umesh V; Rao, C N R (IOP Publishing Ltd, 2011-02-09)

Temperature effects on the various features in the Raman spectra of several graphene samples and graphene nanoribbons have been investigated over the temperature range 77-573 K. The temperature coefficient of the G and 2D ...
Structural Instability of the Charge Ordered Compound Nd0.5Sr0.5MnO3 under a Magnetic Field

Mahendiran, R; Ibarra, M R; Maignan, A; Millange, F; Arulraj, A; Mahesh, R; Raveau, B; Rao, C N R (American Physical Society, 1999-03-08)

We report an anomalous magnetostriction behavior of the charge ordered compound Nd0.5Sr0.5MnO3. We have found that the applied magnetic field not only gives rise to a large negative magnetoresistance but also produces a ...
Facile C-O Bond Scission in Alcohols on Zn Surfaces

Harikumar, K R; Vinod, C P; Kulkarni, G U; Rao, C N R (American Chemical Society, 1999-04-01)

Interaction of methanol, ethanol, and 2-propanol with polycrystalline as well as (0001) surfaces of Zn has been investigated by photoelectron spectroscopy and vibrational energy loss spectroscopy. All the alcohols show ...
Role of oxygen transients in the facile scission of C-O bonds of alcohols on Zn surfaces

Harikumar, K R; Rao, C N R (Royal Society of Chemistry, 1999-02-21)

The alkoxy species produced by the interaction of alcohols with Zn surfaces undergoes C-O bond scission at 150 K giving hydrocarbon species, but this transformation occurs even at 80 K when alcohol-oxygen mixtures are ...
Synthesis and characterization of a three-dimensional open-framework lead(II) carboxyethylphosphonate, Pb-3(O2CCH2CH2PO3)(2)

Ayyappan, S; de Delgado, G Diaz; Cheetham, A K; Ferey, G; Rao, C N R (Royal Society of Chemistry, 1999-09-07)

The hydrothermal synthesis and single crystal XRD characterization of a three-dimensional open-framework lead(II) carboxyethylphosphonate, Pb-3(O2CCH2CH2PO3)(2), is described; the structure contains PbO3, PbO4 and PbO5 ...
Layered Tin(II) Oxalates Possessing Large Apertures

Natarajan, Srinivasan; Vaidhyanathan, R; Rao, C N R; Ayyappan, S; Cheetham, Anthony K (American Chemical Society, 1999-06)

Two layered tin(II) oxalate structures have been prepared by hydrothermal methods in the presence of structure-directing organic amines, The crystal data for these structures are as follows: oxalate I, [(CH3)(2)NH(CH2)(2 ...
A Zinc Phosphate Possessing Ladder-like Layers Made Up of Three- and Four-Membered Rings and Infinite Zn-O-Zn Chains

Neeraj, S; Natarajan, Srinivasan; Rao, C N R (American Chemical Society, 1999-05)

A new open-framework zinc phosphate, [NH3(CH2)(2)NH(CH2)(2)NH3](2+)2[Zn2PO4(HPO4)](-), possessing a layered architecture and consisting of alternating inorganic and organic layers, stabilized by multipoint hydrogen bonding ...
Three-dimensional open-framework zinc phosphates with the structure-directing organic amines acting as ligands

Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Gauthier-Villars/Editions Elsevier, 1999-03)

Two new three-dimensional zinc phosphates I, [NH(CH2)(2)NH2(CH2)(2)NH3](2+) [Zn-5(PO4)(4)](2-), and II, [CN5H6](+) [Zn-2(PO4)(HPO4)](-), where the structure-directing organic amine acts as a ligand, have been synthesized ...
Amine Phosphates as Intermediates in the Formation of Open-Framework Structures

Neeraj, S; Natarajan, Srinivasan; Rao, C N R (WILEY-VCH Verlag GmbH, 1999)

Chain, ladder, layer, and three-dimensional metal phosphates were obtained by the reaction of amine phosphates with metal ions under mild hydrothermal conditions. The role of amine phosphates as intermediates in hydrothermal ...
An open-framework iron phosphate with large voids, exhibiting spin-crossover

Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 1999-07-21)

A novel iron phosphate, [(C4N3H16)(C4N3H15)](5+)-[Fe5F4(H2PO4)(HPO4)(3)(PO4)(3)](5-). H2O, consisting of a Fe-O/F-Fe network crosslinked by PO4 groups is shown to possess unusually large elliptical voids of 24 T atoms (T ...
New Open-Framework Zinc Oxalates Synthesized in the Presence of Structure-Directing Organic Amines

Vaidhyanathan, R; Natarajan, Srinivasan; Cheetham, Anthony K; Rao, C N R (American Chemical Society, 1999-12)

Two new open-framework zinc oxalates have been prepared by hydrothermal methods in the presence of structure-directing organic amines. The crystal data for these oxalates are as follows: I, [H3N(CH2)(3)NH3](2+)[Zn-2(C2O4)(3)](2-). ...
A hybrid open-framework iron phosphate-oxalate with a large unidimensional channel, showing reversible hydration

Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (American Chemical Society, 1999-09)

A novel inorganic-organic hybrid iron phosphate-oxalate material has been synthesized hydrothermally in the presence of ethylenediamine as the structure-directing agent. The three-dimensional solid possesses neutral iron ...
An investigation of carbon nanotubes obtained from the decomposition of methane over reduced Mg1-xMxAl2O4 spinel catalysts

Govindaraj, A; Flahaut, E; Laurent, Ch; Peigney, A; Rousset, A; Rao, C N R (Materials Research Society, 1999-06)

Carbon nanotubes produced by the treatment of Mg1-x,MxAl2O4 (M = Fe, Co, or Ni; r = 0.1, 0.2, 0.3, or 0.4) spinels with an H-2-CH4 mixture at 1070 degrees C have been investigated systematically. The grains of the oxide-metal ...
Synthesis of single-walled carbon nanotubes using binary (Fe, Co, Ni) alloy nanoparticles prepared in situ by the reduction of oxide solid solutions

Flahaut, E; Govindaraj, A; Peigney, A; Laurent, Ch; Rousset, A; Rao, C N R (Elsevier Science BV, 1999-01-29)

Passing a H-2-CH4 mixture over oxide spinels containing two transition elements as in Mg0.8MyMz'Al2O4 (M, M' = Fe, Co or Ni, y + z = 0.2) at 1070 degrees C produces small alloy nanoparticles which enable the formation of ...

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