NOPR Collection:

Square-wave voltammetric method for the determination of trace levels of manganese(IT) and its application to the analysis of low alloy steel

Tue, 01 Feb 2005 00:00:00 GMT

Title: Square-wave voltammetric method for the determination of trace levels of manganese(IT) and its application to the analysis of low alloy steel Authors: Dalvi, Aditi A; Palrecha, M M; Sundaresan, R Abstract: A highly sensitive, rapid and simple square wave-voltammetric procedure for the determination of Mn(II) has been developed. Mn(II) in triethanolamine (0.1 M) and KOH (0.15 M ) gives a well-defined, reversible peak at -0.456V vs. Ag/AgCl. The calibration curve is linear in the concentration range of 0-100 μg/ml. The minimum concentration that can be determined is found to be -40ng/ml (s.d. = 4.2%). Effect of various ions, which commonly occur with Mn (II), has also been studied. The procedure has been applied for the determination of Mn(II) in low alloy steel samples. Page(s): 312-314

K-NEXAFS investigations on some copper (II) complexes

Tue, 01 Feb 2005 00:00:00 GMT

Title: K-NEXAFS investigations on some copper (II) complexes Authors: Sharma, Pooja; Mishra, Ashutosh Abstract: Near edge X-ray absorption fine structure (NEXAFS) covering energy range up to about 50 eV have been studied. The present studies include some copper (II) complexes of biological interest with 3-arylazo-7-hydroxy-4-methylcoumarin as ligand. Studies have been carried out on Seifert X-ray generator and Cauchois type bent crystal X-ray spectrograph of 0.4-m radius. The observed X-ray parameters e.g. chemical shift, shift of principal absorption maximum, edge-width, fractional oxidation number and percentage covalency have been used to explain the structure of the complexes and these parameters have also been correlated with earlier chemical studies. Page(s): 307-311

Synthesis and characterization of some ruthenium (II) complexes containing triphenylphosphine or triphenylarsine with imidazoles

Tue, 01 Feb 2005 00:00:00 GMT

Title: Synthesis and characterization of some ruthenium (II) complexes containing triphenylphosphine or triphenylarsine with imidazoles Authors: Malhotra, Ashish; Sarkhel, Prashant; Das, Mohua; Poddar, Raj K Abstract: Reactions of [RuX₂(PPh₃)₃] (X = Cl or Br) and [RuCl₃,(PPh₃)₃] with L (Im, BzIm or 2-MeIm have been carried out in benzene and compounds of the type [RuX₂(PPh₃) (L)₃] are obtained. Reactions of [RuCl₃(AsPh₃)₂(MeOH)] and [RuBr₃(AsPh₃)₃] with L (L = Im and BzIm) in benzene at room temperature of refluxing conditions lead III the formation of [RuX₂(AsPh₃) (Im)₃] and [RuX₂ (BzIm)₄], respectively. All the compounds have been characterized by analytical data, conductivity measurements, IR, NMR, UV-visible and cyclic voltametric studies. Page(s): 303-306

Molecular ribbons: Hydrothermal synthesis and structural characterization of [{Cu(dipic)(H2O)}2(μ-4,4' -bipy)].2H2O (dipic=pyridine-2,6-dicarboxylato; 4,4'bipy= 4,4' -bipyridyl)

Tue, 01 Feb 2005 00:00:00 GMT

Title: Molecular ribbons: Hydrothermal synthesis and structural characterization of [{Cu(dipic)(H2O)}2(μ-4,4' -bipy)].2H2O (dipic=pyridine-2,6-dicarboxylato; 4,4'bipy= 4,4' -bipyridyl) Authors: Kumaresan, Sudalaiandi; Ramadevi, Palani Abstract: Hydrothermal reaction of Cu(OAc)₂H₂O with pyridine-2,6-dicarboxyk acid (dipicH₂) and 4,4'-bipyridine (4,4'-bipy) afforded an inorganic-organic hybrid material with an empirical formula, C₂₄ H₁₈ O₁₀ N₄ Cu₂.2H₂O (1). Single crystal X-ray structure determination shows that complex (1) crystallized in the triclinic space group P-1. The unit cell contains one and a half molecules of [{Cu(C₇H₃NO₄)(H₂O)}₂ (C₁₀H₈N₂)].2H₂O (l). The crystal structure displays ribbons of (1) in which the 4,4'-bipy ligands are all nearly parallel. The binuclear molecules associate through hydrogen bonding and weak Cu·· ··O interactions. Page(s): 299-302