• KRISHNAMURTHI MURALIDHARAN

      Articles written in Journal of Chemical Sciences

    • Polymerization behaviour of butyl bis(hydroxymethyl)phosphine oxide: Phosphorus containing polyethers for Li-ion conductivity

      Heeralal Vignesh Babu Billakanti Srinivas Khevath Praveen Kumar Naik Krishnamurthi Muralidharan

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      Synthesis of phosphorus containing polyethers and their lithium-ion conductivities for the potential use as solid polymer electrolyte (SPE) in high-energy density lithium-ion batteries have been described. Co-polymerization of butyl bis(hydroxymethyl)phosphine oxide with three different dibromo monomers were carried out to produce three novel phosphorous containing polyethers (P1–P3). These polymers were obtained via nucleophilic substitution reactions and were characterized by 1H, 31P NMR spectral data and gel permeation chromatography. SPEs were prepared using polyethers (P1 and P2) with various amounts of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The lithium-ion conductivity of SPE2 containing 40 wt% of LiTFSI was 2.1 × 10−5 S cm−1 at room temperature and 3.7 × 10−4 S cm−1 at 80°C.

    • 2,4,6-tris[bis(1H-tetrazol-5-yl)amino]-1,3,5-triazine as a nitrogen-rich material

      MUDDAMARRI HANUMANTHA RAO VIKAS D GHULE KRISHNAMURTHI MURALIDHARAN

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      This paper describes the synthesis, characterization and energetic properties of tetrazole and triazine-based thermally stable, insensitive nitrogen-rich high energy density materials of N, N’, N”-(1,3,5- triazine-2,4,6-triyl) tris(N-cyanocyanamide) [1] and 2,4,6-tris[bis(1H-tetrazol-5-yl)amino]-1,3,5-triazine [2]. The compound 2 is the first example for compounds having six tetrazole units on a triazine ring.

    • Surfactant free metal chalcogenides microparticles consisting of nano size crystallites: room temperature synthesis driven by the supersaturated condition

      SANYASINAIDU GOTTAPU VENKATESWARA RAO VELPURI KRISHNAMURTHI MURALIDHARAN

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      A versatile methodology for the production of organic surfactant-free metal chalcogenide microparticles consisting of nano crystallites at room temperature in a short time is described. The reaction of various metal sources with LiBH4 in the presence of either S or Se yielded their corresponding CuS, Cu₂S, CdS and Cu₂-zSe microparticles. These micron size particles are aggregates of nano crystallites. The reactivity of LiBH4 and supersaturated condition helped in the formation nanocrystals. The first observation of metal source dependent morphology of particles produced under identical reaction condition is also discussed. The morphology of CuS particles obtained in these reactions was varying with the change of metal source used in the reaction. Interestingly, the reactions producing metal chalcogenide microparticles also yielded borane (BH₃) as a side product.

    • Nitrogen-rich compounds: s-triazine and tri-s-triazine derivatives as high energy materials

      MUDDAMARRI HANUMANTHA RAO VIKAS D GHULE KRISHNAMURTHI MURALIDHARAN

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      This article describes the syntheses, characterization, and energetic properties of 4, 6-diazido-N,N-dimethyl-1, 3, 5-triazin-2-amine and 2, 4, 6-tris (5-(3, 5-dinitrophenyl)-1H-tetrazol-1-yl)-1, 3, 5-triazine. Also, this paper emphasizes the insensitive and thermally stable energetic molecules like melem, melemammonium perchlorate mixture, and hydrazinium cyamelurate. All these compounds possess good energetic properties viz., the heat of formation and heat of combustion.

      Synthesis and characterizations and energetic properties of 4, 6-diazido-N, N-dimethyl-1, 3, 5-triazin-2-amine (3); 2, 4, 6-tris (5-(3, 5-dinitrophenyl)-1H-tetrazol-1-yl)-1, 3, 5-triazine (4) and hydrazinium cyamelurate (10) are described. The thermal stabilities, energetic properties and sensitivity parameters are compared with standard high-energy materials. (i) Syntheses and characterization of 4, 6-diazido-N, N-dimethyl-1, 3, 5-triazin-2-amine (3); 2, 4, 6-tris (5-(3, 5-dinitrophenyl)-1H-tetrazol-1-yl)-1, 3, 5-triazine (4) and hydrazinium cyamelurate (10) are described. (ii) Experimental energetic properties and sensitivity parameters of these compounds were discussed.

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