bluuebunny/crossref_metadata_2025_split huggingface dataset:
Proton-Catalyzed Formation of Methyl Carbamate in the Reaction of Isocyanic Acid in Methanol
Authors: Yashiro Hitoshi , Takeshita Jun-ichi , Okuwaki Akitsugu , Okabe Taijiro 
Published: July 2006

Abstract
The rate of formation of methyl carbamate has been measured by a determination of the HNCO concentration. It can be expressed as follows: rc=kc[HNCO][H+]. This rate equation was confirmed in the concentration range of HCl(0.76–1.53×10−3 mol dm−3). Consequently, this reaction was subjected to a proton catalysis. However, at a H+ concentration lower than 4×10−4 mol dm−3, the observed rate was lower than that calculated by the rate equation, especially at a high HNCO concentration. This was explained by a reduction of the free HNCO concentration due to an association of HNCO with the formed carbamate.
Synthesis of β(1–4)-Linked Disaccharides of N-Acetylglucosamine and N-Acetylmuramic Acid by Their Direct Condensation
Authors: Kusumoto Shoichi , Imoto Masahiro , Ogiku Tsuyoshi , Shiba Tetsuo 
Published: July 2006

Abstract
As a basic study in the synthetic approach to immunoactive cell wall peptidoglycan whose backbone is a β(1–4)-linked saccharide of alternating glucosamine and muramic acid, methods for the direct condensation of these sugar components were studied and O-(N-acetyl-β-muramyl)-(1→4)-N-acetyl-d-glucosamine and O-(N-acetyl-β-d-glucosaminyl)-(1→4)-N-acetylmuramic acid were synthesized. In the synthesis of the latter disaccharide, previous formation of an ester bond between the carboxyl group of muramic acid and the 6-hydroxyl group of glucosamine proved to facilitate the glycoside bond fromation between these sugar moieties.
Studies of Liquid Water by Computer Simulations. IV. Transport Properties of a 2-D Model
Authors: Kataoka Yosuke 
Published: July 2006

Abstract
The constant-temperature constant-pressure molecular dynamics simulations of a water-like system are performed at many temperatures and pressures. A 2-dimensional model of water is used for the system with 576 molecules in a square cell. Thermodynamical quantities are anomalous as in liquid water. The temperature-dependences of the calculated self-diffusion coefficient and the shear viscosity are in agreement with the observed values at low pressures. The effects of compression on these transport coefficients are reproduced qualitatively. The bulk viscosity obtained is larger than the shear viscosity. The order of magnitude of the calculated thermal conductivity is in agreement with the experimental results. The contribution of the rotational motion to the thermal conductivity is calculated in order to discuss the anomalous temperature-dependence of this coefficient.
Formation of New Paramagnetic Complexes between Quinones and Their Semiquinone Anions in the Presence of a Cryptand or a Crown Ether
Authors: Suga Kosaku , Takiguchi Tsuyoshi , Aoyagui Shigeru 
Published: July 2006

Abstract
The formation of new paramagnetic complexes is evidenced by the ESR spectra of anion radicals of duroquinone, p-benzoquinone, and 2,5-di-t-butyl-p-benzoquinone in tetrahydrofuran, which are recorded in the presence of their parent molecules and cryptand 222 or 18-crown-6. The numerical values for the equilibrium constant, standard enthalpy and standard entropy of the complex formation are also determined.
Phase Transition of Quaternary Alkyl Halide Salts of 1,4-Diazabicyclo[2.2.2]octane
Authors: Shimizu Jun , Imamura Kengo , Nogami Takashi , Mikawa Hiroshi 
Published: July 2006

Abstract
A series of quaternary alkyl halide salts of 1,4-diazabicyclo[2.2.2]octane (DABCO) exhibited first-order phase transitions in the temperature range of 62–100 °C Abrupt changes of halide anion conductivities were observed by two to three orders of magnitude at the transition temperatures. The transition temperature and the heat of transition tend to increase with the increase of the alkyl chain length. The temperature dependence of an IR spectrum showed that the band progressions due to long alkyl chain disappeared above the phase transition. This fact suggests that the trans-zigzag conformation of alkyl chains in the low temperature phase is destroyed by the internal rotation of the alkyl chain above the transition temperature.
Effect of Electrochemical Pretreatment on Catalytic Activity of Bismuth Ruthenate Electrodes for Oxygen Evolution in Alkaline Solution
Authors: Iwakura Chiaki , Edamoto Toshiyuki , Tamura Hideo 
Published: July 2006

Abstract
The catalytic activity of a film-type bismuth ruthenate electrode for oxygen evolution was greatly enhanced by the electrochemical pretreatment, including potential holding and cycling. On the other hand, any appreciable enhancement in catalytic activity was not observed for a pellet-type bismuth ruthenate electrode. Such an pretreatment effect was explained on the basis of the participation of higher valence Ru species in the oxygen evolution reaction, rather than the increase of surface area.
Synthesis and Properties of Oxo Complex of Ruthenium(IV), trans-[RuCl(O)(py)4]+, which is Formed by the Oxidation of Nitrosyl Complex of Ruthenium(II), trans-[RuCl(NO)(py)4]2+
Authors: Aoyagi Kimitake , Yukawa Yasuhiko , Shimizu Kunio , Mukaida Masao , Takeuchi Toshio , Kakihana Hidetake 
Published: July 2006

Abstract
Oxidation of trans-[RuCl(NO)(py)4]2+ with NaClO gives oxo complex of RuIV, trans-[RuCl(O)(py)4]+, with bond breaking of the metal-nitrosyl ligand. An X-ray structural study revealed that the complex has a much longer Ru–O bond distance (1.862(8) Å) than those of known mono-oxo complexes. A facile reactivity of the oxoruthenium(IV) complex was observed: with methanol methoxo complex, trans-[RuCl(OMe)(py)4]+, was formed. With PPh3, a two-electron transfer process was indicated by the formation of Ph3PO.
Preparation of Alkyl Dihydrogenphosphates with Monomeric Metaphosphate Anion Generated by Photochemical C–P Bond Cleavage of p-Nitrobenzylphosphonic Acid
Authors: Iwamoto Narimasa , Okamoto Yoshiki , Takamuku Setsuo 
Published: July 2006

Abstract
Alkyl dihydrogenphosphates were prepared by a procedure that probably involves a monomeric metaphosphate anion as an intermediate. The monomeric metaphosphate anions used in this reaction were generated by a photochemical C–P bond cleavage of the p-nitrobenzylphosphonate dianion. The photolysis of a 1:2 molar mixture of p-nitrobenzylphosphonic acid and 1,8-diazabicyclo[5.4.0]undec-7-ene (or 2,2,6,6-tetramethylpiperidine) in excess alcohol gave alkyl dihydrogenphosphate in fairly good yield.
Kinetic Studies of Fast Equilibrium by Means of High-Performance Liquid Chromatography. XIV. Separation of Rotamers of Phenyl Methylcarbamates and Their Rotational Energy Barriers
Authors: Moriyasu Masataka , Yamagami Chisako , Kato Atsushi , Hashimoto Yohei , Takao Narao 
Published: July 2006

Abstract
High-performance liquid chromatography(HPLC) of six phenyl methylcarbamates at low column temperatures on normal phase chromatography using hydroxyl-group chemically-bonded silica gel packing achieved the separation of rotamers. The population ratios of rotamers were determined for different conditions such as solvent composition and concentration. The rotational-energy barriers to intramolecularbond rotation about the carbonyl–nitrogen bonds were determined for four p-substituted phenyl methylcarbamates, and it was found that the energy barriers were higher when electron-withdrawing groups were substituted.
Bulk Copolymerization of Acrylonitrile with Allyl Chloride and Thermal Analysis of the Products
Authors: Okamoto Masao , Suenaga Kiyoshi , Ishizuka Osamu 
Published: July 2006

Abstract
The bulk copolymerization of acrylonitrile (M1) with allyl chloride (M2), carried out at 40 °C, was initiated by 0.05 mol% of α,α′-azobisisobutyronitrile under nitrogen. The compositions of six copolymers were in the range of allyl chloride units, 0.63–6.32 mol%. The monomer reactivity ratios r1 and r2 were calculated to be 6.04 and 0.035, respectively. Only three copolymers were soluble in N,N-dimethylformamide and their intrinsic viscosities were found to be greater than 4.5 dL g−1. The chlorine contents, although 0.42, 0.87, and 1.03 wt%, were sufficiently effective to cause a change in the behavior of the thermal degradation of polyacrylonitrile (PAN). In DTA curves measured at a rate of 5 °C min−1 under nitrogen for copolymers containing ca. 1 wt% of chlorine, a sharp exotherm due to the polymerization of cyano groups shifted to the higher-temperature side (ca. 40 °C) and the differential temperature decreased to about 1/6. Moreover, the weight loss at 350 °C decreased from 19 wt% for PAN to 13 wt%. A similar thermal-degradation behavior was also observed for acrylonitrile–α-chloroacrylonitrile (CAN) copolymers. However, there was a great difference between allyl chloride and CAN units concerning the effect on the thermal degradation of PAN. Namely, only 1.5 mol% of allyl chloride units corresponded to 10 mol% of CAN units.
Viscosity B-Coefficients of 1:1 Electrolytes in Acetonitrile–Water Mixtures at 25 and 35 °C
Authors: Kumar Gopu , Dey Nibaran C , Saikia Birendra K , Haque Inamul 
Published: July 2006

Abstract
Viscosity B-coefficients of the Jones–Dole equation were determined for KCl, KBr, KI, NaBr, CsI, Me4NBr, Et4NBr, n-Pr4NI, n-Bu4NBr, and Na[BPh4] at 25 and 35 °C in various acetonitrile–H2O mixtures. The B-coefficients were split into the ionic components and a comparison was made among different methods available. The effective flow volume, Ve° obtained from B=2.5 Ve° was compared with the crystal ionic volume, Vcryst° and the ionic partial molar volume, \barVion° determined from the density experiments simultaneously carried out. Ion-solvent and solvent-solvent interactions were discussed in terms of the above parameters.
A Synthesis of Methyl 3-O-(β-d-Mannopyranosyl)-α-d-mannopyranoside from Sulfonate Intermediates
Authors: Awad Laila Fathy , El Ashry El Sayed H , Schuerch Conrad 
Published: July 2006

Abstract
Methyl 3-O-(β-d-mannopyranosyl)-α-d-mannopyranoside was synthesized by the reaction of 3,4,6-tri-O-benzyl-2-O-benzylsulfonyl-1-O-tresyl-d-mannopyranose with methyl 2,4,6-tri-O-benzyl- and 2,4,6-tri-O-(p-bromobenzyl)-α-d-mannopyranoside, followed by deprotection. The corresponding 1-O-(β-tolylsulfonyl)derivative gave better yield and stereoselectivity in the reaction with methanol, but was not sufficiently reactive to couple with a hindered secondary alcohol. The 2-O-benzylsulfonyl group is comparable in β-directing effect to 2-O-methylsulfonyl group, but its stereoselectivity is dependent on the structure of the reactant alcohol. It can be selectively removed by the reaction with sodium amide in N,N-dimethylformamide.
Synthesis and Characterization of Imidazolate-Bridged Binuclear Copper(II) Complexes
Authors: Matsumoto Naohide , Murakami Hiroyuki , Akui Toshifumi , Honbo Jukichi , Okawa Hisashi , Ohyoshi Akira 
Published: July 2006

Abstract
An unsymmetrical quadridentate copper(II) complex containing an imidazole moiety ([CuHL](ClO4)) reacts with [1,4,7,10-tetraazacyclododecane]copper(II) perchlorate and [2-[2-(2-pyridyl)ethyliminomethyl]pyridine]copper(II) perchlorate in the presence of one equivalent of triethylamine to give two discrete imidazolate-bridged binuclear copper(II) complexes, 1 and 2 respectively, where [H2L] denotes the 1:1:1 condensation product of acetylacetone, ethylenediamine, and 4-formylimidazole. The analysis of the cryomagnetic data(ca. 80–300 K) on the basis of the Heisenberg model of a binuclear structure gave the antiferromagnetic interaction parameter(2J) of −107.7 cm−1 for 2.
Out-of-Plane Vibrations of [1H5]- and [2H5]Pyridines
Authors: Ozono Yoshimi , Maehara Masayoshi , Nibu Yoshinori , Shimada Hiroko , Shimada Ryoichi 
Published: July 2006

Abstract
Assignments of the out-of-plane normal vibrations of [1H5]- and [2H5]pyridines were reexamined based on the polarization behavior of the Raman bands and also through the normal coordinate calculation.
Formation of Bis(2-oxazolidinone) Derivatives by Reactions of 2-Methoxy-3,3-dimethyl-2-phenyloxirane or α-Bromoisobutyrophenone with Carbon Dioxide and Aliphatic α,ω-Diamines
Authors: Saito Norio , Hatakeda Kiyotaka , Ito Shota , Asano Takashi , Toda Takashi 
Published: July 2006

Abstract
Reactions of 2-methoxy-3,3-dimethyl-2-phenyloxirane or α-bromoisobutyrophenone and carbon dioxide in the presence of aliphatic α,ω-diamines were investigated. 1,4-Butanediamine, 1,6-hexanediamine, 1,8-octanediamine, and 1,4-bis(aminomethyl)benzene afforded corresponding 3-(ω-aminoalkyl)-4-hydroxy-5,5-dimethyl-4-phenyl-2-oxazolidinones and 3,3′-polymethylenebis[4-hydroxy-5,5-dimethyl-4-phenyl-2-oxazolidinones] derivatives, while ethylenediamine gave only mono(2-oxazolidinone) derivative.
Kinetic and Equilibrium Studies of Complex Formation of Nickel(II) with Carboxylate Ligands at High Pressure. IV. Nickel(II) Malate and Nickel(II) Tartrate
Authors: Inoue Tohru , Kojima Kiyotaka , Shimozawa Ryosuke 
Published: July 2006

Abstract
Kinetic and equilibrium measurements were carried out for the complexation reaction of nickel(II) malate and nickel(II) tartrate in an aqueous solution at 20 °C and at pressures up to 100 MPa. From the pressure dependence of the stability constant and the rate constant, the reaction volume, ΔV0, and the activation volume, ΔVf*, for the complex formation were estimated as follows: ΔV0=17.8±0.6 cm3 mol−1 and ΔVf*=13.8±0.6 cm3 mol−1 for nickel(II) malate, and ΔV0=17.8±0.5 cm3 mol−1 and ΔVf*=13.7±1.2 cm3 mol−1 for nickel(II) tartrate. Comparing the ΔV0 values with those obtained for other carboxylate ligands, it was inferred that both malate and tartrate ions form a six-membered chelate complex coordinated by carboxyl and hydroxyl oxygens. The rate-determining step of the overall complexation reaction was assigned to the first bond formation process based on the ΔVf* value with the correction for the volume change associated with the outer-sphere complex formation.
Studies of the Hydrous Tin(IV) Oxide Ion Exchanger. V. The Sodium Isotopic Exchange Rate between the Exchanger in the Na+ Form and Aqueous Solutions
Authors: Inoue Yasushi , Yamazaki Hiromichi , Osawa Akira 
Published: July 2006

Abstract
The sodium isotopic exchange rate between the hydrous tin(IV) oxide ion exchanger in the Na+ form and aqueous solutions was determined radiochemically. When the dried exchanger was used, the rate of the first step was controlled by the rate of the equilibration of water in the exchanger with the solutions, while the second step was found to be controlled by the diffusion of sodium ions in the particles (particle diffusion). When the exchanger had been sufficiently immersed in solutions in advance, the particle diffusion controlled the rate from the beginning. From the dependency of the rate of particle diffusion on the apparent particle size and the specific surface area of the exchanger, and on the sodium-ion concentrations in the solutions, the process controlling the rate is considered to be the diffusion in the primary particles, which are formed at the initial stage of precipitation and which aggregate to form the hydrous tin(IV) oxide gel. The diffusion constants and their activation energy (35±2 KJ mol−1) were also evaluated.
Solvation of Anions in Water–Acetonitrile Mixtures
Authors: Miyaji Kiyoshi , Morinaga Kenichi 
Published: July 2006

Abstract
The enthalpies of transfer from water to mixtures with acetonitrile(ΔHt°) for various anions reach maxima at a mole fraction of acetonitrile(xAN)ca. 0.3, and decrease linearly and in parallel in the intermediate region. A linear relation is found between ΔHt° at xAN 0.3 and the hydration enthalpies for halide and symmetrical ions. This finding and the parallel xAN dependence of ΔHt° in the intermediate region are interpreted on the basis of the linear relation between the solvation enthalpies and the entropies for the halide ions. The reduction in the hydrogen-bonding interaction extending beyond the primary hydration sphere(ΔHINT) for halide ions in the mixtures is estimated based on a modified Eley and Evans hydration model. At xAN 0 to ca. 0.3, ΔHINT compared with that in water agree well with the observed ΔHt°, indicating that the increase in ΔHt° is due to the reduction in the outer hydration sphere interaction. However, they split’gradually at xAN above 0.3. The adequacy of the modifications in the treatment of the solvation enthalpy cycle in the mixtures is re-evaluated from the structural viewpoint. The exothermic change in the intermediate region may be attributable to the reduction in the cavity formation energy.
Kinetic and Mechanistic Investigations of the Reduction by Radicals of Nitro to Hydroxyamino Groups in a Cobalt(III) Cage Compound
Authors: Tsukahara Keiichi 
Published: July 2006

Abstract
A compound containing both a hydroxyamino and a nitro group in a cobalt(III) cage complex was detected and isolated in a DQ\underset.+(1,1′-ethylene-2,2′-bipyridinium radical cation) reduction of the corresponding symmetric dinitro compound, [Co(diNOsar)]3+ (diNOsar=1,8-dinitro-3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane). The nitro group of this compound was reduced to the hydroxyamino group by SO2−, MDQ\underset.+(1,1′-ethylene-4,4′-dimethyl-2,2′-bipyridinium radical cation), and PDQ\underset.+(1,1′-trimethylene-2,2′-bipyridinium radical cation). Rate constants for the various processes were obtained.
Syntheses and Properties of Hepta- and Dibenzopentafulvalene Derivatives Containing 13-, 15-, 17-, and 19-Membered Rings
Authors: Asao Toyonobu , Morita Noboru , Ojima J\={u}ro , Fujiyoshi Masamitsu , Wada Kazuyo , Hamai Satoru 
Published: July 2006

Abstract
5,10-Dimethy 1-6,8-bisdehydroheptatridecafulvalene 10, 10-methy 1-6,8-bisdehydro-4,5-benzoheptatridecafulvalene 11, 6,8-bisdehydro-4,5:10,11-dibenzoheptatridecafulvalene 12, 5,10-dimethyl-6,8-bisdehydroheptapentadecafulvalene 13, 5,10,15-trimethylheptapentadecafulvalene 14, 7,12-dimethylheptaheptadecafulvalene 15, and 7,12-dimethylheptanonadecafulvalene 16 were synthesized by a reaction of 8-oxoheptafulvene 8 with the corresponding bisdehydroannulenones 1–7. Dibenzo derivatives of 5,10-dimethyl-6,8-bisdehydropentatridecafulvalene 23, 10-methyl-6,8-bisdehydro-4,5-benzopentatridecafulvalene 24, 6,8-bisdehydro-4,5:10,11-dibenzopentatridecafulvalene 25, 5,10-dimethylpentapentadecafulvalene 26, 5,10,15-trimethylpentapentadecafulvalene 27, 7,12-dimethylpentaheptadecafulvalene 28, and 7,12-dimethylpentanonadecafulvalene 29 were also synthesized by the reaction of 9-fluorenylidenemethanone 21 with the corresponding annulenones 1–7. Furthermore, a benzoannelated series of heptapentadecafulvalenes 30–35 was also synthesized. The 1H NMR spectra of these hepta- and dibenzopentafulvalenes are discussed in connection with their tropicity. It can be concluded that a slight polarization of π-electrons through pinch bonds from the seven-membered rings to the many-membered rings in the heptafulvalene system and from the many-membered rings to the five-membered rings in the pentafulvalene system exist regardless of the size of the many-membered rings.
Direct Diacetylmethylation of Aromatic Compounds with Tris(2,4-pentanedionato)manganese(III)
Authors: Nishino Hiroshi 
Published: July 2006

Abstract
The oxidation of naphthalenes with tris(2,4-pentanedionato)manganese(III) in acetic acid gave diacetylmethyl derivatives in good to moderate yields. Using excess amounts of the oxidant, the acetylmethyl-substituted naphthalenes were further oxidized and 3-acetoxy-3-naphthyl-2,4-pentanediones were obtained. The similar oxidation of anthracenes also produced (diacetylmethyl)anthracenes together with diacetylmethylene derivatives which were further oxidized. It was found that this direct diacetylmethylation was effective when the ionization potential of the aromatic compound was lower than 8.12 eV, and that the diacetylmethyl radical which was generated directly by the thermolysis of tris(2,4-pentanedionato)manganese(III) has an electrophilic nature based on the result of the oxidation of substituted naphthalenes. The reaction pathway for the oxidation of anthracene is also discussed.
Zeolite-Promoted Benzylation of Alcohols
Authors: Onaka Makoto , Kawai Motomitsu , Izumi Yusuke 
Published: July 2006

Abstract
Zeolite-promoted benzylation of alcohols with benzyl chloride has been investigated. By use of a series of cation-exchanged zeolites, which have the same crystalline structure but different acid and base properties, it is confirmed that the cooperative function of acid sites and base sites of zeolite is required for the effective benzylation of alcohols although both acid and base strengths are low. It is also found that alcohols show different reactivities in zeolite from those in solution depending on their molecular structures because the benzylation is promoted inside the narrow cavities of zeolite.
Syntheses and Properties of α-Alkyl-Substituted Bisdehydroaza[14]annulenes and the Related Benzannelated Derivatives
Authors: Ojima J\={u}ro , Yagi Yasuhiro , Ejiri Emiko , Ishizaka Shuichi , Kato Tadahito 
Published: July 2006

Abstract
14-Ethoxy-2,5,10-trimethyl-6,8-bisdehydroaza[14]annulene, 14-ethoxy-2-ethyl-5,10-dimethyl-6,8-bisdehydroaza[14]annulene, 2-ethoxy-3,11-dimethyl-5,6-benzo-7,9-bisdehydroaza[14]annulene, and 2-ethoxy-1 1,14-dimethyl-5,6-benzo-7,9-bisdehydroaza[14]annulene were synthesized. Influence of α-alkyl substitution and benzannelation upon the skeleton of the bisdehydroaza[14]annulene ring system is discussed on the basis of 1H NMR and UV spectra of these azaannulenes and their α-alkyl unsubstituted ones.
Syntheses and Properties of Two Ethoxytrimethylbisdehydroaza[16]annulenes and Ethoxytrimethylbisdehydroaza[18]annulene
Authors: Ojima J\={u}ro , Yagi Yasuhiro , Manaka Sumio , Nakada Tetsuya , Shiraiwa Yasunao 
Published: July 2006

Abstract
Syntheses of 2-ethoxy-3,6,11 -trimethyl-7,9-bisdehydroaza[16]annulene, 2-ethoxy-6,11,16-trimethyl-7,9-bis-dehydroaza[16]annulene, and 18-ethoxy-2,7,12-trimethyl-8,10-bisdehydroaza[18]annulene are described. It was found that the molecular skeletons of these α- or β-methylated aza[16]- and -[18]annulene are less planar than those of α- or β-methyl unsubstituted aza[16]- and aza[18]annulene, from examination of their 1H NMR and electronic spectra.
Stereoselectivity of Cydoaddition of N-(Cyanomethyl)- and N-(α-Cyanobenzyl)imines with Olefinic Dipolarophiles. Synthetic Equivalents of Nitrile Ylide 1,3-Dipoles
Authors: Tsuge Otohiko , Ueno Kazunori , Kanemasa Shuji , Yorozu Kiyotaka 
Published: July 2006

Abstract
N-(Cyanomethyl)- and N-(α-cyanobenzyl)imines derived from a variety of aldehydes and ketones can tautomerize into N-protonated azomethine ylides which undergo cycloadditions with olefinic dipolarophiles. These cycloadditions are often accompanied by the elimination of HCN, mostly in a stereospecific manner, showing these imines to be synthetic equivalents of nonstabilized nitrile ylides. Stereoselectivity of the cycloadditions is discussed.
Cis-Trans Isomerism among the Octahedral Anionobis(C-substituted ethylenediamine)nickel(II) Complexes Obtained by Thermal Reactions
Authors: Ihara Yoshinori , Fukuda Yutaka , Sone Kozo 
Published: July 2006

Abstract
Ten octahedral anionobis(C-substituted ethylenediamine)nickel(II) complexes were obtained by thermal reactions of corresponding diaqua salts, and their electronic and IR spectra were examined to see whether they are cis or trans. Most of them were found to be trans, but [Ni(NO3)(m-bn)2](NO3) and [NiCl2(i-bn)2] were cis.