bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ion Exchange Resins Anchoring 1,8-Diazabicyclo[5.4.0]undec-7-ene
Authors: Ishikawa Tomomichi , Yoneyama Atsushi 
Published: July 2006

Abstract
The synthesis of polymeric quaternary ammonium salts linked 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU) to chloromethylated polystyrenes is described. The polymers so obtained become anion exchangers with both quaternary ammonium and tertiary amino groups. The values of the total ion-exchange capacities indicated that the quaternization of the tertiary amino groups on the polymers with hydrochloric acid is difficult. The chloride forms of the resins, in spite of their bulky and steric quaternary ammonium groups containing DBU, were effective as ion exchangers for a variety of bulky anions such as sulfate, oxalate, hexacyanoferrate(II), hexacyanoferrate(III), and tris(oxalato) ferrate(III) ions. The free base forms of the resins gave low reactivity for chloride and sulfate ions. Some examples of the application of the resins is also reported.
Effect of Ethanol on the Inclusion Complex Formation between β-Cyclodextrin and Pyrene
Authors: Nakajima Akira 
Published: July 2006

Abstract
The effect of the addition of ethanol on the formation of the inclusion compound between β-cyclodextrin and pyrene in aqueous solution has been studied. Based on the time dependences of the fluorescence spectra of pyrene as a probe, the rate constants estimated for the inclusion and further association in the presence of ethanol have been discussed.
The Crystal Structure of Calcium Sulfite Hemihydrate
Authors: Matsuno Takashi , Takayanagi Hiroaki , Furuhata Kimio , Koishi Masumi , Ogura Haruo 
Published: July 2006

Abstract
The crystal data for calcium sulfite hemihydrate are orthorhombic, Pbcn, a=10.664(1), b=6.495(1), c=9.823(1) Å, and Z=8. The structure consists of two alternating layers. The calcium ions are coordinated by six O atoms: Five originate from the sulfite ions, and one from the water molecule.
Binuclear Metal Complexes. LIV. Strongly Spin-coupled Copper(II)–Iron(III) Complex of a Salen Homolog Containing Pendant Phenolic Group
Authors: Kanda Wakako , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
A copper(II)–iron(III) binuclear complex of N,N′-disalicylidene-2-methyl-4-(2-hydroxy-5-methylphenyl)-1,2-butanediamine has been prepared and characterized. Cryomagnetic measurements revealed the presence of an antiferromagnetic spin-exchange interaction of J=−70 cm−1 between the metal ions.
Synthesis of Sydnone Compounds Having Alternating Carbon-Nitrogen Chain and Heterocyclic Groups at the 4-Position
Authors: Fuchigami Toshio , Yeh Mou-Yung , Goto Takushi , Nonaka Tsutomu , Tien Hsien-Ju 
Published: July 2006

Abstract
Entirely new type sydnones having alternating carbon-nitrogen chain groups such as 3-aryl-4-(arylcarbonimidoylcarbamoyl)sydnones, 3-aryl-4-(dimethylaminomethylenecarbamoyl)sydnones, and 4-(dimethylaminomethylenethiocarbamoyl)-3-phenylsydnone were prepared in high yields from 3-aryl-4-chloroformylsydnone, 3-aryl-4-carbamoylsydnone, and 3-phenyl-4-thiocarbamoylsydnone, respectively. The cyclization of the alternating carbon-nitrogen chain groups provided new sydnone derivatives having heterocyclic substituents such as 1,2,4-oxadiazol-5-yl, 1,2,4-triazol-3-yl, and 1,2,4-thiadiazol-5-yl groups in good yields.
Regularity in Homolytic Lattice Energies of Anhydrous Formate, Acetate, Oxalate, and Glycolate of Metals
Authors: Sakiyama Minoru , Murata Shigeo 
Published: July 2006

Abstract
The homolytic lattice energy ΔUR of an ionic crystal MxAy was defined as the standard internal energy change at 298.15 K for the following vaporization process to yield neutral species M and A: (l/x)MxAy(c)=M(g)+(y/z)A(g). ΔUR and [ΔUR–(y/x)ΔHfo(A,g)] were calculated for formates and acetates and for oxalates and glycolates, respectively, of metals, and were analyzed empirically. ΔUR(formate)\simeqΔUR(acetate) holds for every metal. ΔUR of oxalates and glycolates may be expressed as follows: ΔUR(oxalate or glycolate)=aΔUR(formate or acetate)+b(y/x), where a is the constant close to unity, and b is the constant which is, possibly, close to zero for oxalates and about 40 kJ mol−1 for glycolates. The linear relations in ΔUR were discussed in relation to crystal structure of the salts and carboxyl O–H bond dissociation energy of the corresponding carboxylic acids.
The Molecular Structures of (+)-6-Benzylsparteine, (Ethyl)(bromo)[(+)-6-benzylsparteine]magnesium(II), and Dibromo[(+)-6-benzylsparteine]magnesium(II). Structure and Reactivity of the Grignard Reagent–(−)-Sparteine Derivative Complexes for Asymmetric Selective Polymerization of Racemic Methacrylates.
Authors: Kageyama Hiroyuki , Miki Kunio , Kai Yasushi , Kasai Nobutami , Okamoto Yoshio , Yuki Heimei 
Published: July 2006

Abstract
(+)-6-Benzylsparteine (a) crystallizes in orthorhombic systems; P212121, a=10.711(1), b=25.868(4), c=6.804(1) Å, and Z=4;EtMgBr-(+)-6-benzylsparteine (b) also belongs to orthorhombic system; P212121, a=11.020(4), b=23.660(10), c=8.666(6) Å and Z=4; and MgBr2−(+)-6-benzylsparteine toluene solvate (c), orthorhombic system; P212121, a=16.654(3), b=19.723(4), c=8.637(2) Å and Z=4. The structure of a was solved by the direct method and those of b and c by the heavy atom method. Refinements were carried out by the block-diagonal least-squares procedure; R values are: (a) 0.055. (b) 0.169, and (c) 0.118, respectively for 1342, 1445, and 1501 reflections. The a molecule takes a one-boat form, whereas by, coordination to the Mg atom it changes into all-chair form in b and c molecules. The Mg atom has a distorted tetrahedral geometry; b, Mg–N=2.13(4) and 2.19(4), Mg–C 2.34(5) and Mg–Be=2.506(16) Å and N–Ng–N=83.1(14)°; c, Mg–N=2.08(3) and 2.17(3), Mg–Br=2.454(12) and 2.473(12) Å and N–Mg–N=85.8(10)°. The structures of these molecules are compared with those of (−)-sparteine complexes with EtMgBr, t-BuMgCl, and MgCl2. On the basis of the molecular structures determined the activity of these Grignard reagent–(−)-sparteine derivatives for the enantiomer-selective polymerization of MBMA is discussed.
Decay Mechanism of the Aromatic Hydrocarbon Biradical, 1,1′-Biacenaphthene-2,2′-diyl. Effects of Solvent and Heavy-atom Perturbation
Authors: Kobashi Harumichi , Kondo Reiko , Ikawa Hiroki , Morita Toshifumi 
Published: July 2006

Abstract
Effects of solvents and heavy-atom (H–A) containing compounds on the lifetime of the title biradical (1) have been examined to elucidate the decay mechanism of 1 in fluid solutions by means of nanosecond laser spectroscopy. 1 was quenched effectively by H–A compounds such as diethylmercury and iodoethane. The decay rates of 1 showed no explicit correlation with solvent polarities, while a linear correlation was found between the decay rate and the sum of squares of the spin-orbit (S–O) coupling factors of heavy atoms involved in the solvents; chlorobezene, 1,2-dichloroethane, dichloromethane, bromobenzene, and dibromomethane. It has been shown that (i) the biradical lifetime is determined by intersystem crossing (ISC) from the triplet to singlet spin state prior to chemical reactions, (ii) ISC is enhanced by H–A perturbation through the S–O interaction, and (iii) the reactivity of the singlet biradical (11) but not the triplet one (31) sways the product distribution in the triplet-sensitized photodimerization of acenaphthylene.
Decrease in the Quantum Efficiency of a Cadmium Sulfide Photoanode Due to Sulfur Deposition. Determination of Quantum Efficiency by Temperature Measurement
Authors: Fujishima Akira , Li Tian-kai , Zhu Yau-ning , Zhou Guo-ding , Li Xue-ping 
Published: July 2006

Abstract
CdS photoelectrodes dissolve during photoanode reactions in a supporting electrolyte solution, and the quantum efficiency changes due to sulfur deposition. Temperature measurement technique has been used in this work to determine the quantum efficiency of the CdS photoelectrode. It has been found that decreases in the quantum efficiency can be monitored easily by this method.
Phase Equilibria in the Ln2O3–V2O3–V2O5 (Ln=Dy and Ho) Systems at 1200 °C
Authors: Kitayama Kenzo , Katsura Takashi 
Published: July 2006

Abstract
Phase equilibria in the systems, Dy2O3–V2O3–V2O5 and Ho2O3–V2O3–V2O5, were established at 1200 °C by changing the oxygen partial pressure from 4.32 to –7.50 Pa in terms of logPo2. In both systems, Ln2O3, LnVO4, LnVO3, VnO2n−1(n=2–7), VO2, and Ln8V2O17(4Ln2O3·V2O5) are stable, and compounds with mole ratio Ln2O3/V2O5=5⁄1 are not stable under the present experimental conditions. On the basis of the established phase diagrams, the standard Gibbs energies of reactions, (1) 3 Dy2O3+2 DyVO3+O2=Dy8V2O17, (2) DyVO3+1/2 O2=DyVO4, (3) 3 Ho2O3+2 HoVO3+O2=Ho8V2O17, and (4) HoVO3+1/2 O2=HoVO4, were determined to be −278, −123.8, −277, and −122.4 kJ, respectively. LnVO4, Ln8V2O17, V2O3, and VO2 have nonstoichiometric compositions. ΔG° values for reactions (2) and (4) fit well on the linear line presented by us.
Synthesis and Stereoselectivity of Cobalt(III) Complexes of Quadridentate Ligands Possessing SNNS Array of Donor Atoms
Authors: Yamanari Kazuaki , Takeshita Norimatsu , Shimura Yoichi 
Published: July 2006

Abstract
Several thiolato complexes of [Co(SNNS)(diamine)]+ type were prepared (diamine stands for en=1,2-ethanediamine, R-pn=(R)-1,2-propanediamine, and RR-chxn=(R,R)-1,2-cyclohexanediamine) and characterized from their visible–UV absorption, circular dichroism, and 13C NMR spectra, where SNNS denotes two kinds of open-chain quadridentate ligands, H2endet=3,6-dimethyl-3,6-diazaoctane-1,8-dithiol and R-H2pndet=(R)-3,4,6-trimethyl-3,6-diazaoctane-1,8-dithiol. Both the SNNS ligands gave the two geometrical isomers, cis-α(dark green) and cis-β(dark violet), whereas 3,7-dimethyl-3,7-diazanonane-1,9-dithiolate(2–) ligand gave no stable monomeric complex. Interestingly, stereoselective complex formation was found in Δ-cis-α-[Co(R-pndet)(en or RR-chxn)]+, Δ(SNRN)-cis-β-[Co(endet)(R-pn or RR-chxn)]+, and Δ(SNRN)-cis-β-[Co(R-pndet)(en or RR-chxn)]+, the Δ-cis-α configuration of the former complex being the novel one having the equatorially-oriented terminal chelate rings on the tertiary nitrogen atoms.
Chemical Synthesis of a Heat-stable Enterotoxin Produced by Enterotoxigenic Escherichia coli Strain 18D
Authors: Yoshimura Shoko , Miki Makoto , Ikemura Haruo , Aimoto Saburo , Shimonishi Yasutsugu , Takeda Tae , Takeda Yoshifumi , Miwatani Toshio 
Published: July 2006

Abstract
Two peptides with the two primary structures of 18 amino acid residues proposed for a heat-stable enterotoxin from enterotoxigenic Escherichia coli strain 18D were synthesized by solution methods and their physicochemical and biological properties were compared with those of native toxin. One of these peptides (Asn–Thr–Phe–Tyr–Cys–Cys–Glu–Leu–Cys–Cys–Asn–Pro–Ala–Cys–Ala–Gly–Cys–Tyr) showed the same heat-stability and 1H-NMR spectrum as those of the native toxin and evoked fluid secretion in suckling mice at a dose of 1.5–2.0 ng, which is similar to the effective dose of native toxin. Moreover, its toxicity was neutralized by antisera against the native toxin. The other peptide (Asn–Thr–Phe–Tyr–Cys–Cys–Glu–Leu–Cys–Cys–Tyr–Pro–Ala–Cys–Ala–Gly–Cys–Asn) showed different physicochemical and biological behaviors from those of the native toxin and exhibited toxic activity at a dose of 50–80 ng, which is about thirty times the effective dose of the native toxin. Moreover, its toxicity was not neutralized by antisera against the native toxin. These observations indicate that the former peptide is identical to native toxin but that the latter peptide differs in properties from the native toxin.
Kinetics and Mechanism of Complex Formation of Nickel(II) with 1-(2-Pyridylazo)-2-naphthol in Acetic Acid
Authors: Hioki Akiharu , Funahashi Shigenobu , Tanaka Motoharu 
Published: July 2006

Abstract
The complex formation reactions of nickel(II) nitrate, nickel(II) acetate, and nickel(II) chloride with 1-(2-pyridylazo)-2-naphthol (PAN) in acetic acid (HOAc) to form the 1:1 nickel(II)–PAN complex have been studied kinetically by using a stopped-flow technique. The second-order rate constants and activation parameters at 25 °C are k=(1.4±0.1)×104 mol−1 kg s−1, ΔH\eweq=51.2±1 kJ mol−1, ΔS\eweq=6.4±4 J mol−1 K−1, and ΔV\eweq=23.4±2.4 cm3 mol−1 for Ni(NO3)2, k=(1.1±0.1)×104 mol−1 kg s,−1, ΔH\eweq=49.5±1 kJ mol−1, ΔS\eweq=−1.3±4 J mol−1 K−1, and ΔV\eweq=15.5±2.6 cm3 mol−1 for Ni(OAc)2, and k=(4.8±0.1)×104 mol−1 kg s−1, ΔH\eweq=51.4±1 kJ mol−1, ΔS\eweq=17.0±4 J mol−1 K−1, and ΔV\eweq=35.4±5.5 cm3 mol−1 for NiCl2. The positive value of ΔV\eweq strongly suggests a dissociative mode of activation.
The Reaction of 5-Benzylidene-2,3,4,5-tetrahydropyridine with Some Nucleophiles
Authors: Nomura Yujiro , Bando Takashi , Takeuchi Yoshito , Tomoda Shuji 
Published: July 2006

Abstract
The reaction 5-benzylidene-2,3,4,5-tetrahydropyridine (1) with nucleophilic reagents, such as sodium tetrahydroborate, lithium tetrahydridoaluminate, organometallic reagents, pyrrole, or ethyl propiolate, has been studied. The reaction of 1 with sodium tetrahydroborate, lithium tetrahydridoaluminate, phenylmagnesium bromide, butyllithium gave exclusively respective 1,2-adducts. The reaction with pyrrole gave a tricyclic 1:1 adduct while 1 formed a 1:2 adduct with ethyl propiolate.
Catalytic Activity of Highly Dispersed Palladium. III. The Effect of Added Zirconium Oxide upon Palladium Metal Surface Revealed by a Combined Infrared Spectroscopic and Thermal Desorption Study of Carbon Monoxide Adsorption
Authors: Lee Bu Yong , Inoue Yasunobu , Yasumori Iwao 
Published: July 2006

Abstract
A combined infrared spectroscopic (IR) and thermal desorption (TD) study of CO adsorption was carried out to reveal the nature of Pd surface which is modified by the addition of ZrO2. The TD spectra of CO from SiO2- or α-Al2O3-supported Pd showed two broad peaks, α at 340 K and β at 530 K. The addition of ZrO2 in a range of atomic ratios of Zr/Pd=0.5–3.0 produced a new broad peak δ at 390–420 K and the β peak shifted toward higher temperature by 16–19 K. The IR spectra of CO on Pd/SiO2 catalysts, consisting of two broad bands: A (2030–2070 cm−1) and B (1880–1920 cm−1), were modified by the addition of ZrO2 to give rise to a new sharp band, Bh (1970–1985 cm−1) and to make the A band narrower. From the correspondence of the variation in intensities and position of the IR bands with those in the fraction of coverage of CO with temperature, the α peak was correlated to the A band, the δ peak to the Bh band, and the β peak to the B band. The changes in the TD peaks and the IR bands caused by added ZrO2 were semiquantitatively compared and are discussed in terms of the electronic and geometric effects; a high electron density state of Pd surface atoms as well as the formation of adsorption sites with specific structure is proposed. A brief study was made for the role of the sites in the catalytic hydrogenation of ethylene and cyclohexene.
Physicochemical Studies of an Activated Europium Ion-exchanged Mordenite
Authors: Arakawa Tsuyoshi , Takakuwa Midori , Adachi Gin-ya , Shiokawa Jiro 
Published: July 2006

Abstract
The physicochemical properties of an activated Eu(III) ion-exchanged mordenite (Eu–M) have been studied by the measurement of the fluorescence of the europium ion. When Eu–M (the exchanged level; 3.7%) was degassed only above 300 °C, a band emission which peaked at 488 nm appeared. This band emission was associated with the Eu2+ 5d–4f transition. The peak of the band emission shifted linearly to a shorter wavelength with the increase in the exchanged level of the Eu ions. For the Eu–M sample, which was reduced by H2 at 500 °C, the peak position of the band emission was almost 499 nm in all cases, and the quantum yield for a reduced sample was larger than that for a dehydrated sample. The quantum yield for a reduced sample fell off extremely above the exchanged level of 6%. Moreover, the Eu2+–Eu22+ energy transfer in the reduced samples was discussed.
Association between Polar Molecules. III. 1H and 13C NMR Studies on the Dipole Association of Acetonitrile Derivatives with Tetramethylurea and Dibutyl Sulfoxide in Nonpolar Solvents
Authors: Takagi Tatsuya , Fujiwara Hideaki , Sasaki Yoshio 
Published: July 2006

Abstract
Dipole association between acetonitrile derivatives and polar substances such as tetramethylurea and dibutyl sulfoxide is investigated in nonpolar solvents. Association parameters and thermodynamic parameters are derived and discussed in relation to the substituent constants. 1H and 13C NMR chemical shifts show that the major structures of the associate are antiparallel. Association energies are also determined using semiempirical MNDO MO method, which supports the experimental results for energies as well as structures.
Conductivity and Ion Association of Some Diastereoisomeric Salts in Water. I. Δ-[Co(NO2)2(en)2]Δ-[Co(edta)] and Λ-[Co(NO2)2(en)2]Δ-[Co(edta)] at 15, 25, and 35 °C
Authors: Yokoyama Haruhiko 
Published: July 2006

Abstract
Electric conductivities of the diastereoisomeric salts, Δ(−)589-[Co(NO2)2(en)2]Δ(+)546-[Co(edta)] and Λ-(+)589-[Co(NO2)2(en)2]Δ(+)546-[Co(edta)], were measured in water at 15, 25, and 35 °C. Results were analyzed in terms of the conductivity equations of Fuoss-Hsia and Pitts. The obtained values of the ion-association constant are large and decrease with increasing temperature. The results can not be entirely explained by the electrostatic theories of ion association and suggest the formation of contact ion pairs, attributable to the existence of interactions other than simple electrostatic ones between the complex ions. No appreciable difference is found in the obtained thermodynamic parameters of ion association between the two salts. Ion–solvent interactions and effective sizes of the dissolved complex ions are also discussed in connection with the estimation of the closest distance of approach of the ions.
An Analysis of the E(0g+) Ion-pair State of Bromine through Stepwise Excitation Technique
Authors: Ishiwata Takashi , Tokunaga Atsuto , Shinzawa Tsutomu , Tanaka Ikuzo 
Published: July 2006

Abstract
The pulses of the fundamental and its frequency doubled outputs from a tunable dye laser are used to promote a stepwise exciation of the E(0g+)–X1Σg+ transition through the B3Π(0u+) state in molecular bromine. The double resonance is detected by the associated UV emission which originates from the E(0g+) state radiating back to the B3Π(0u+) state. The E(0g+) state is analyzed in detail on the basis of the selection rules of two transition components and the E–B fluorescence spectrum. The molecular parameters are derived as Te=49778.5 cm−1, ωe=150.8 cm−1, ωexe=0.41 cm−1, and re=3.197 Å for the 79Br2 isotope species.
Intra- and Intermolecular [3++2] Cycloadditions of Aldehyde or Ketohydrazones
Authors: Shimizu Tomio , Hayashi Yoshiyuki , Nakano Mineo , Teramura Kazuhiro 
Published: July 2006

Abstract
The reaction of several 2-(alkenyloxy)benzaldehydes (or 1-naphthaldehydes) (1) with arylhydrazine hydrochlorides leads to intramolecular [3++2] cycloadducts, 3-substituted 2-aryl-1,2,3,3a,4,9b(or 1,2,3,3a,4,11c)hexahydro[1]benzopyrano (or naphtho[1′,2′:5,6]pyrano)[4,3-c]pyrazole hydrochlorides (4), in good yields. Free bases (5) were obtained in high yields after the treatment of 4 with triethylamine. The thermal treatment of 5 at 150 °C gave 3-substituted 2-aryl-2,3,3a,4-tetrahydro[1]benzopyrano(or naphtho[1′,2′:5,6]pyrano)[4,3-c]pyrazoles. The reaction of 1 with methylhydrazine sulfate gave the corresponding 2-methyl derivatives. Analogous intramolecular [3++2] cycloadducts were obtained from the reaction of 2′-(alkenyloxy)acetophenones with arylhydrazine hydrochlorides. Intermolecular [3++2] cycloadducts were also obtained from a reaction mixture of 1-naphthaldehyde, arylhydrazine hydrochlorides, and styrene.
Ion Exchange Studies of Zinc Chloride and/or Perchlorate in Ethylene Glycol
Authors: Kumagai Tetsu 
Published: July 2006

Abstract
The formation constants of zinc chloride and/or perchlorate in ethylene glycol were measured by a cation exchange method using the resin for forced-flow liquid chromatography in three systems: zinc chloride, zinc perchlorate, and zinc chloride and perchlorate together. The values obtained for the formation constants were: logβ1Cl=3.03, logβ2Cl=4.80, logβ1ClO4=2.34, and logβ2ClO4=2.50. The formation constant for the mixed complex of zinc, logkmClO4, was 0.7 at the ionic strength of 0.1. The formation constants of zinc chloride in ethylene glycol containing 5 v/v% of water were 2.73 for logβ1Cl and 4.18 for logβ2Cl, and those containing 10% of water were 2.32 for logβ1Cl and 3.46 for logβ2Cl.
Synthesis of Sydnone Compounds Having Heterocyclic Groups at the 4-Positions from 4-(Bromoacetyl)sydnones
Authors: Fuchigami Toshio , Goto Takushi , Yeh Mou-Yung , Nonaka Tsutomu , Tien Hsien-Ju 
Published: July 2006

Abstract
New sydnone derivatives having heterocyclic substituents such as 4-thiazolyl, 3-thienyl, 2H-1,4-benzothiazin-3-yl, 2H-1,4-benzoxazin-3-yl, and 1,2-dihydro-3-quinoxalinyl groups at the 4-positions were prepared from 4-bromoacetyl-3-arylsydnones (1). Sydnone compounds substituted by a 1,2,3-triazol-4-yl group were prepared via new type phosphonium ylids derived from 1. Electroreduction of 1 was also attempted in order to prepare a syndnone derivatives having a furyl group.
Kinetics and Mechanism of Bromine Addition to Derivatives of Unsaturated Aliphatic Carboxylic Acids in Aqueous Solution
Authors: Mohamed Farook Syed Ahamed , Viswanathan Seshaiyer , Ganesan Ramachandran 
Published: July 2006

Abstract
This paper deals with the kinetics of bromine addition to unsaturated compounds in presence of added bromide ions at 22, 30, 38, 46, and 54 °C. The substrates used were acrylamide (AAm), methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), t-butyl acrylate (tBA), methacrylamide (MAAm), methyl methacrylate (MMA), ethyl methacrylate (EMA), methyl crotonate (MC), and ethyl crotonate (EC). The kinetics was followed potentiometrically. The activation parameters (ΔH\eweq, ΔS\eweq, and ΔG\eweq) were calculated and compared. Estimation of product ratio of bromohydrin to dibromide showed the absence of any correlation of the product formation with reactivity of the substrates. The observed parameters are discussed in relation to the proposed reaction mechanisms.
A New Version of Inclusion of Overlap Charges in ω-Technique. π-Bond Energies, Heats of Formation, and Resonance Energies of Conjugated Hydrocarbons
Authors: Tewari Vindhya Prasad , Lal Krishna Behari , Srivastava Arun Kumar 
Published: July 2006

Abstract
With systematic approximations to Roothaan equation it has been possible to deduce the IOC-ω-technique (inclusion of overlap charges in ω-technique) which apparently approximates the SCF-equations by bringing in an approximate correction for the two center-two electron repulsion integrals and represents a better version of PPP (Pariser-Parr-Pople) method by involving the hybrid integrals which have been completely neglected in PPP-approximations. In the present communication a new version of IOC-ω-Technique has been used for evaluating the π-bond energies, heats of formation and resonance energies of some conjugated hydrocarbons. The calculated values are found to be in excellent agreement with the experimental data and with some previously calculated values.
Determination of the Vapor Pressures of Lithium Chloride and Sodium Bromide by a Molecular Effusion–Surface Ionization Method
Authors: Kawano Hiroyuki , Kenp\={o} Tsutomu 
Published: July 2006

Abstract
By means of molecular effusion from a Knudsen cell and of thermal positive ionization on a glowing polycrystalline rhenium filament, the vapor pressure P (in atm) of LiCl or NaBr was measured as a function of cell temperature T (in K). The following equations were established empirically.
log10P(LiCl)=(7.948±0.102)−(10954±76)⁄T for 662–848 K,
log10P(NaBr)=(7.716±0.072)−(11138±55)⁄T for 669–882 K.