• A Srinivasa Rao

      Articles written in Journal of Chemical Sciences

    • Ultrasonic velocity and absorption on methylmetha acrylic resins

      C Rakkappan A Srinivasa Rao B Krishnan

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      Ultrasonic velocity and absorption were studied in autocure and heatcure resin monomers at different temperatures. Ultrasonic velocity increased in the autocure sample while absorption was reduced. This is attributed to the presence of certain structural factors such as hydrogen bonding.

    • Non-covalent O$\cdots$O interactions among isopolyanions using a cis-{MoO2} moiety by the assistance of N-H$\cdots$O hydrogen bonds

      T Arumuganathan A Srinivasa Rao Samar K Das

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      An inorganic-organic hybrid material, [2-AmpH]4[Mo8O26] (1) has been isolated by the reaction of Na2MoO$_4·2$H2O with 2-aminopyrimidine (2-Amp) from an acidic aqueous medium. In this low pH synthesis, the organic molecule (2-Amp) gets mono-protonated (2-AmpH+) and acts as the cation in stabilizing the octamolybdate anion in 1. Compound 1 crystallizes in the triclinic space group 𝑃-1 with 𝑎 = 9.925(3), 𝑏 = 10.020(3), 𝑐 = 10.414(3) Å, 𝛼 = 88.811(4), 𝛽 = 64.907(4), 𝛾 = 89.506(4)°, 𝑍 = 1. An interesting three-dimensional supramolecular structure, having well-defined channels, is formed through N-H$\cdots$O and C-H$\cdots$O hydrogen bonds, in which the protonated organic cation plays a significant role. The crystal structure also reveals an unusual cluster-cluster (non-covalent O$\cdots$O) interaction using cis-(MoO2} moieties of the isopolyanion. N-H$\cdots$O hydrogen bonds, originated from pyridimidinium cation and isopolyanion, are found to influence to attain such non-covalent O$\cdots$O interactions among polyoxometalate anions. An interesting helical arrangement, formed from isopolyanion and organic cation, is observed.

    • Polyoxometalates: Toward new materials

      A Srinivasa Rao T Arumuganathan Vaddypally Shivaiah Samar K Das

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      This article describes an account of some of our polyoxometalate (POM)-based research, we have been doing in our laboratory last several years. There are several well-defined POM cluster anions, that are structurally characterized. We have chosen Anderson-type of heteropolyanion [Al(OH)6Mo6O18]$^{3−}$ and explored its linking propensity in different dimensions using `s', `d' and `f' block elements as linkers.We have demonstrated how a lanthanide linker provides a new pathway in forming a two-dimensional linked {As8V14} system [{Ln(H2O)6}2As8V14O42(SO3)]$_n$.8nH2O, that is derived from discrete {As8V14} cluster containing compound (NH4)6[As8V14O42(SO3)]. A polyoxometalate compound has been described in which a reduced tungstovanadate-heteropolyanion clusters get linked via capped V = O groups into one-dimensional chains. All these systems have already been reported elsewhere. The last portion of this article will be described by a new system [3-ampH]6[V10O28]$\cdot$2H2O having discrete molecular structure and extended supramolecular structure.

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