NOPR Collection:

Correlation of some physical properties of aliphatic monoalcohols and amines by graph theory

Sun, 01 Mar 1992 00:00:00 GMT

Title: Correlation of some physical properties of aliphatic monoalcohols and amines by graph theory Authors: Semwal, R P Abstract: Correlation analysis of the boiling points, melting points, densities and refractive indices of C₁ to C₃₄ aliphatic monoalcohols and C₁, to C₁₈ aliphatic amines has been carried out on the basis of graph theory. Converging polynomial equations of the form y = a₀+ a₁x + a₂x² + ... + a_nxⁿ are found to reproduce the

values of these properties very well. The coefficients in the equation for each property and its corresponding statistical parameters, viz.,r, σ, F-ratio and ESS values are given. Page(s): 141-145

Oxygen atom transfer reactions by Ru(V) oxo complexes: Models by cytochrome P450 oxidase

Sun, 01 Mar 1992 00:00:00 GMT

Title: Oxygen atom transfer reactions by Ru(V) oxo complexes: Models by cytochrome P450 oxidase Authors: Khan, M M Taqui; Chatterjee, Debabrata; Rao, A Prakash; Mehta, S H Abstract: Ruthenium(V) oxo complexes of the composition LRu^v=O {L = ethylenediaminetetraacetate (ED-TA), propylenediaminetetraacetate (PDTA), N-hydroxyethylethylenediaminetriacetate (HEOTA)} and the ion [O = Ru^vCl₂(H₂O)₃]⁺ act as excellent catalysts in the oxygen atom transfer reactions to organic substrates. These nonporphyrinic complexes of Ru(V) oxo species are isolated and are much more stable than the Fe(V) oxo complexes of the porphyrins. They are good models for the Cyt P-450 oxidase type of reactions. Page(s): 146-151

Hydrogen bonding or transient coordination of pendant group: Cause for lability in ligand substitution reaction of aminopolycarboxylatoruthenium(III) complexes

Sun, 01 Mar 1992 00:00:00 GMT

Title: Hydrogen bonding or transient coordination of pendant group: Cause for lability in ligand substitution reaction of aminopolycarboxylatoruthenium(III) complexes Authors: Khan, M M Taqui; Bajaj, H C; Chatterjee, Debabrata Abstract: The rate of substitution of water molecule in [LRu^III(H₂O)l complexes [L= ethylenediaminetetraacetate (EDTA) anion and N-hydroxyethylethylenediaminetriacetate (HEDTRA) anion] with CI^- ion has been studied spectrophotometrically in aqueous medium at 30°C. The rates of substitutions of CI^- in [LRuCI] with thiocyanate (SCN^-) have also been studied as a function of SCN^- concentration in the temperature range 30-50°C. In both the cases, ruthenium(III)-EDTA is found to be more reactive than the corresponding HEDTRA complex. Activation parameters H^≠ and S^≠ for the substitution of [LRu^IIICI]^- complexes with SCN^- are determined and a suitable mechanism is proposed. The reactivity of [LRu^IIICI]^- towards SCN^- substitution is discussed in terms of the transient coordination of the uncoordinated - COOH or -CH₂ - OH pendant group which assists in the elimination of leaving group and ligation of substituting nucleophiles. Page(s): 152-155

Synthesis and characterization of novel homo- and hetero-Ieptic alkoxometallates of manganese(II)

Sun, 01 Mar 1992 00:00:00 GMT

Title: Synthesis and characterization of novel homo- and hetero-Ieptic alkoxometallates of manganese(II) Authors: Dubey, R K; Singh, A; Mehrotra, R C Abstract: Hetero bimetallic alkoxides of manganese(II) of the types, [CI Mn{AI(OBuⁱ)₄}], [Mn{Al(OBuⁱ)₄}₂], [CI Mn{Zr₂(OPrⁱ)₉}₂], [Mn{Zr₂(OPrⁱ)₉}₂] and [Mn{Nb(OPrⁱ)₆}₂] have been synthesised by the interaction of an appropriate potassium alkoxometallate in desired molar ratio with MnCl2 in benzene-alcohol medium. Chloride replacement reactions in (chloro)alkoxometallatomanganese(II) have led to the formation of hetero (bi- or tri-) metal alkoxide derivatives of the types such as, [(RO)Mn{Zr₂(OPrⁱ)₉}] (R = Prⁱ and Buⁱ), [(BuⁱO)Mn{Al(OBuⁱ)₄}] and [{Nb(OPrⁱ)₆]Mn{Al(OBuⁱ)₄}]. Alcoholysis has also been carried out. These heterometal alkoxides of Mn(II) have been characterized by elemental analyses, electronic, IR, ESR and magnetic susceptibility measurements. Page(s): 156-159