bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cobalt(III) Complexes with Quadridentate Ligands. IV. The Preparation and Properties of “cis-β1 and β2” Isomers of the 2-Methyl-8-quinolinolato(triethylenetetramine)-cobalt(III) and Related Complexes
Authors: Yamamoto Yoshihisa , Toyota Eiko , Yamamoto Yutaka 
Published: July 2006

Abstract
cis-β1- and β2-8-Quinolinolato or 2-methyl-8-quinolinolato(triethylenetetramine)cobalt(III) complexes, (Remark: Graphics omitted.) (R: H, Me; X: Cl, NO3), have been isolated from a reaction mixture of cis-α-dichloro(triethylenetetramine)cobalt(III) chloride, Ag2O, and 8-quinolinol or 2-methyl-8-quinolinol. The separation of their cis-β and β2 isomers was achieved by the use of ion-exchange resin. The IR spectra of these complexes showed five or six absorption bands in the 990–1100 cm−1 region and four or five absorption bands in the 3000–3300 cm−1 region. This indicates that these complexes assume the β form. In cis-β1-2-methyl-8-quinolinolato(triethylenetetramine)cobalt(III) complexes, the methyl group of the coordinated 2-methyl-8-quinolinolato ligand has a steric hindrance for the NH-side methylene protons of the coordinated trien ligand. On the other hand, no methyl group of the corresponding cis-β2 form has steric hindrance for the methylene protons of the coordinated trien ligand. Therefore, the distinction of the cis-β1 form and the β2 form of these complexes has been clarified on the basis of their 1H NMR spectra. Also, the 13C NMR spectra of these complexes have shown two different configurations of the “cis-β1 and β2” forms.
Electrochemical Reduction of Some Tris(β-diketonato)ruthenium(III) Complexes in Acetonitrile and Interaction of the Reduced Anions with Lithium and Sodium Ions
Authors: Endo Akira 
Published: July 2006

Abstract
In tetraethylammonium perchlorate–acetonitrile solution, [Ru(R1–CO–CR2–CO–R3)3] (R1,R3=–CH3, –CF3, –C6H5, –C(CH3)3; R2=–H, –C6H5) was reversibly reduced at a dropping mercury electrode to the corresponding univalent anion. A linear relationship was found between the half-wave potential and the sum of the Hammett constants of the substituents of ligands. In some cases, the polarogram and the cyclic voltammogram were shifted to more positive potentials in the presence of lithium or sodium ions. This effect was explained quantitatively by the two-step association between the reduction product, [Ru(R1–CO–CR2–CO–R3)3]−, and alkali metal ions. The association constants were calculated. The K2 values were appreciable and the K1 values were much larger than expected for a simple electrostatic interaction. Furthermore, the K1 values were linearly related to the sum of the Hammett constants of the substituents of the ligands. These results suggest the importance of the local charge distribution on the complex anions. In the presence of lithium ion, [Ru(acac)3]− forms Li[Ru(acac)3] which is insoluble in acetonirile.
Reactive Troponoids and o-Aminophenol. V. The Reaction of 3-Bromo-2-methoxytropone and o-Aminophenol
Authors: Someya Taichi , Okai Harue , Wakabayashi Hidetsugu , Nozoe Tetsuo 
Published: July 2006

Abstract
The reaction products of the title substances in hot acetic acid were separated by preparative TLC into compounds A–L according to the Rf-values, and the structural assignments for these products were now made as follows: A, 14H-[1,4]benzoxazino[3′,2′ : 3,4]cyclohepta[1,2-b][1,4]benzoxazine; B, 1-formylphenoxazine; F, cyclohepta[2,1-b : 2,3-b′]di[1,4]benzoxazine; G, cyclohepta[b][1,4]benzoxazin-10(11H)-one or its enolic form; J, cyclohepta[b][1,4]benzoxazin-6(11H)-one; L, 6-(o-hydroxyanilino)cyclohepta[b][1,4]benzoxazine hydrobromide. A small amount of 2-methylamino-3H-phenoxazin-3-one was also produced. Possible reaction pathways for the formation of these products are also discussed.
Cyclotrimerization and Polymerization of 1-Hexyne Catalyzed by Group 5, 6 Transition Metal Chlorides
Authors: Masuda Toshio , Deng Yun-Xiang , Higashimura Toshinobu 
Published: July 2006

Abstract
1-Hexyne could be cyclotrimerized selectively and quantitatively by NbCl5 and TaCl5. The cyclotrimer formed consisted of 1,2,4- and 1,3,5-isomers. The 1,2,4/1,3,5 isomer ratio of the product was about 70/30–80/20 with NbCl5, and about 55/45–70/30 with TaCl5. The polymerization of 1-hexyne by MoCl5- and WCl6-based catalysts afforded a methanol-insoluble polymer and methanol-soluble products in comparable amounts. The polymer (mol wt 3000–5000) was an orange-yellow viscous material with structure [ \llap–CH=C(n-Bu)  \llap–]n. For comparison, the cyclotrimerization and polymerization using Ziegler catalysts were also examined.
N-Alkylation of Pyrrole, Indole, and Several Other Nitrogen Heterocycles Using Potassium Hydroxide as a Base in the Presence of Polyethylene Glycols or Their Dialkyl Ethers
Authors: Sukata Kazuaki 
Published: July 2006

Abstract
The alkylation of pyrrole and indole in aqueous potassium hydroxide-organic two-phase systems in the presence of polyethylene glycols (PEG) or their dialkyl ethers (PEG-ether) as phase transfer catalysts (PTC) gave substantial quantities of the C-alkylated and C,N-polyalkylated products as well as the N-alkylated products. This fact is similar to that obtained in the presence of quaternary ammonium salts as PTC. In powdered potassium hydroxide-organic two-phase systems, the yields of the N-alkylated products were generally high. Especially, when PEG-ether were employed as solvents, the N-alkylated products were obtained in excellent yields under mild conditions. Imidazole, benzimidazole, carbazole, 2-methylindole, and benzotriazole were similarly N-alkylated in high yields by this method.
Assignment of a Characteristic Infrared Absorption Band at 810 cm−1 in Heat-treated Polyacrylonitrile
Authors: Okamoto Masao 
Published: July 2006

Abstract
When polyacrylonitrile (PAN) was heat-treated at about 250 °C under nitrogen, a violent exothermic reaction took place. PAN lost weight and the infrared absorption at 2240 cm−1 disappeared, but there was little change in the atomic ratios of carbon, hydrogen, and nitrogen. This indicates that fragmentation is accompanied by rapid polymerization of cyano groups. The sample obtained after the completion of the exothermic reaction seems to be liable to oxidation, because a strong exothermic reaction and weight gain occur immediately if air is admitted to enter. During the oxidation the percentages of carbon and nitrogen did not change, but that of hydrogen largely decreased, indicating the occurrence of oxidation and subsequent dehydration in the moieties subjected to polymerization of cyano groups. Therefore, the tri-substituted carbon-carbon double bonds are formed in the six-membered ring systems. A new infrared absorption band which appears at 810 cm−1 is assigned to the C–H out-of-plane bending vibration in such a double bond.
The Dissolution of Heat-treated Acenaphthylene Pitch
Authors: Yamada Yoshio , Shiraishi Minoru , Furuta Takeshi , Yamakawa Toshio 
Published: July 2006

Abstract
About half of the pyridine insolubles in heat-treated acenaphthylene pitch was dissolved into hydrogenated pitch. Observation with optical and scanning electron microscopes showed that the components dissolved consisted of small mesophase spherules with an optically isotropic texture.
Partial Benzylation of Methyl α- and β-d-Galactopyranosides
Authors: Morishima Naohiko , Koto Shinkiti , Oshima Megumi , Sugimoto Akiko , Zen Shonosuke 
Published: July 2006

Abstract
Partial benzylation of methyl α-d-galactopyranoside with benzyl chloride and LiOH selectively gave the 2,3,6-tribenzyl ether, while that using KOH or RbOH gave the 2,4,6-isomer as the main product. Methyl β-d-galactopyranoside afforded the 3,4,6-tribenzyl ether predominantly, irrespective of the alkali used.
Convenient Preparation of Tetraarylphosphonium Halides
Authors: Migita Toshihiko , Nagai Tohru , Kiuchi Kazuhiko , Kosugi Masanori 
Published: July 2006

Abstract
Tetraarylphosphonium halides, particularly iodides, can be conveniently prepared by the Pd-catalyzed reaction of aryl halides and triarylphosphines in good yields.
Free Energy, Enthalpy, and Entropy Changes of Mixing of Aqueous Solutions of d-Glucose and Tetraalkylammonium Bromide at 25 °C
Authors: Miyajima Koichiro , Sawada Masahiro , Nakagaki Masayuki 
Published: July 2006

Abstract
Changes of free energy and enthalpy of mixing of aqueous solutions of d-glucose and tetraalkylammonium bromide were measured at 25 °C by isopiestic method and calorimetry, and excess thermodynamic quantities and transfer functions were calculated. All transfer functions were positive and mutual salting-out was observed. The positive value of free energy of transfer of tetrabutylammoniun bromide from water to aqueous d-glucose solution comes from the predominance of enthalpic term over entropic term. These results are interpreted in terms of the structural incompatibility of hydration cospheres around these two kinds of solutes.
The Effect of Surfactant on Formation of Calcium Carbonate
Authors: Suhara Tsuneo , Esumi Kunio , Meguro Kenjiro 
Published: July 2006

Abstract
Calcium carbonate was precipitated by rapidly mixing calcium chloride solution, sodium carbonate solution, and aqueous surfactant solution at 25 °C in order to elucidate the effect of addition of surfactant on the formation. The samples obtained were examined by scanning electron microscopy, X-ray powder diffraction, and a specific surface area study. The sample without surfactant proved to be calcite crystals. When a cationic surfactant was added, the crystal structure was transferred from calcite and vaterite to calcite with an increase of the concentration of the cationic surfactant. On the other hand, the addition of a lower concentration of an anionic surfactant provided a mixture of calcite and vaterite, but in higher concentration, amorphous material was obtained. The samples with nonionic surfactant were vaterite crystals. It was found that the spherical particle ratio (Nsp) and the vaterite crystal ratio (Fv) in the sample depend on the concentration of the nonionic surfactant.
The Preparation and X-Ray Structures of Di-μ-sulfido- and μ-Oxo-μ-sulfido-bis[tris(isothiocyanato)oxomolybdate(V)] Ions
Authors: Shibahara Takashi , Kuroya Hisao , Matsumoto Keiji , Ooi Shun’ichiro 
Published: July 2006

Abstract
The crystal structures of (pyH)4[Mo2O2S2(NCS)6] (1) (pyH=pyridinium ion) and (pyH)4[Mo2O3S(NCS)6]·2H2O (2) have been determined from the diffractometer data. The 1 and 2 structures were refined by the least-squares method to R 0.041 and 0.064 for 2728 and 2349 non-zero reflections respectively. The two structures are isomorphous. Each Mo(V) ion has a distorted octahedral coordination, and two coordination octahedra share a common edge to form a binuclear complex. The binuclear complex contains a mirror plane through two bridging atoms. The two terminal oxo ligands on each Mo(V) are cis to each other and cis to the bridging oxo or sulfido. The Mo–N(NCS) bond length trans to the Mo–Ot (terminal oxo) is ca. 0.1 Å longer than the other Mo–N(NCS) bond lengths, showing the large trans effect of the Ot ligand.
Preparation, Racemization, and Deuteration of 2-(Methylthio)propionato-S,O and 2-Sulfinatopropionato-S,O Complexes of Cobalt(III)
Authors: Kojima Masaaki , Fujita Junnosuke 
Published: July 2006

Abstract
(+)589-[Co{SCH(CH3)COO}(tren)]+, (−)589-[Co{CH3SCH(CH3)COO}(tren)]2+, and (+)589-[Co{S(O)2CH(CH3)COO}(tren)]+ (tren=tris(2-aminoethyl)amine) were prepared and assigned to the trans(tertiary amine nitrogen, S) isomer with the R carbon atom on the basis of the absorption, CD, and 1H NMR spectra. Racemization of the complexes was studied in aqueous solutions with ionic strength of 0.1, 0.2, or 1.0 (NaClO4) in the pH and temperature ranges of 5.96–6.86 and 19.9–49.5 °C, respectively. The CH3SCH(CH3)COO− and −O2SCH(CH3)COO− complexes follow the rate law, R=kr[OH−][complex]. The second-order rate constants (kr) for the former and the latter complexes are 4.6×103 (35.3 °C) and 7.8×103 (35.2 °C) mol−1 dm3s−1, respectively. The −SCH(CH3)COO− complex did not racemize under these conditions. Deuteration of the methine protons in the complexes was found to proceed simultaneously with the racemization. The differences in reactivity to racemization and proton exchange among three complexes were accounted for by the difference in electron-withdrawing effect of the −S–, S(CH3)–, and −S(O)2– groups, and by the difference in net charge of the complex ions.
Immunoassay Using a Metal-complex Compound as a Chemiluminescent Catalyst. II. An Improvement of the Analytical Method for Practical Use
Authors: Hara Tadashi , Toriyama Motohiro , Tsukagoshi Kazuhiko 
Published: July 2006

Abstract
Immunoassay using a synthesized metal-complex compound as a labeling reagent has been investigated. Iron(III) 2,9,16,23-tetrakis(chlorocarbonyl)phthalocyanine, which showed a marked catalytic action in the chemiluminescence reaction between luminol and H2O2, was synthesized, and albumin was labeled with it. Albumin in the range from 50 ng/tube to 50 μg/tube could be determined by measuring the chemiluminescence intensity in a competitive immunoassay using glass beads immobilized with an antibody. The present method became about 40 time as sensitive as the previous method by optimizing the labeling procedure, the chemiluminescence reaction, and the immune reaction.
Studies on the β-Turn of Peptides. V. Turn Preference of Peptide Sequence Analyzed by Conformational Energy Calculation on Dipeptide Models and by CD Spectra of Chromophoric Derivatives
Authors: Kawai Masao , Sato Kazuki , Sugawara Rika , Nagai Ukon 
Published: July 2006

Abstract
Empirical conformational energy calculations were performed on Ac–l-Pro–d-Ala–NHCH3 and Ac–d-Ala–l-Pro–NHCH3. In order to study the turn tendency of the dipeptide sequences turn probabilities and average interterminal distances were calculated. Much larger turn preference of d-Ala containing sequences was indicated compared with the corresponding l-Ala containing sequences. The turn tendency of the dipeptide sequences were shown to be in the order: l-Pro–d-Ala&gt;d-Ala–l-Pro&gt;l-Pro–l-Ala&gt;l-Ala–l-Pro. This order coincides with the order of the magnitude of the Cotton effects in the CD spectra of the chromophoric derivatives having 2,4-dinitrophenylglycyl and glycine-p-nitroanilide at the N- and the C-termini, respectively, of the corresponding dipeptid esequences. This agreement supports the validity of the chiroptical method to study the turn tendency of the peptide sequences using chromophoric derivatives reported earlier.
A Novel Cyclization Reaction of Alkylthiodiphenylcyclopropenium Ions with Acyclic 1,3-Diketones to Give Cyclopentadienols
Authors: Yoshida Hiroshi , Nakajima Mikito , Ogata Tsuyoshi , Matsumoto Kiyoshi , Acheson R Morrin , Wallis John D 
Published: July 2006

Abstract
Reaction of methylthio-, ethylthio-, and benzylthiodiphenylcyclopropenium salts with 2,4-pentanedione (3a) and ethyl acetoacetate (3b) yielded the cyclopentadienol derivatives (4) by ring expansion. One of the products 4a was shown to be 4-acetyl-5-hydroxy-5-methyl-1-methylthio-2,3-diphenyl-1,3-cyclopentadiene by X-ray crystallography. Chemical transformation of the products yielded some cyclopentenones. Triphenylcyclopropenium perchlorate reacted with 3a and 3b affording the ketocyclopropene in good yields.
Restricted Rotation Involving the Tetrahedral Carbon. XLIV. Atropisomers of 2,3-Dichloro-9-(1-hydroxy-1-methylethyl)triptycene and Related Compounds
Authors: Oki Michinori , Tanaka Yoshiyuki , Yamamoto Gaku , Nakamura Nobuo 
Published: July 2006

Abstract
Atropisomers of 2,3-dichloro-9-(1-hydroxy-1-methylethyl)triptycene were obtained as stable compounds at room temperature. The barrier to rotation (±sc→ap) was 34.0 kcal/mol at 153 °C. Other 9-(1-hydroxy-1-methylethyl)triptycenes carrying a substituent in the 1-position of the skeleton gave ±sc isomers only. Attempted isomerization of the ±sc forms failed because the free energy difference between the ±sc and ap forms is great due to the steric effect. ±sc-9-(1-Methoxy-1-methylethyl)-1,4-dimethyltriptycene was prepared in a hope that increasing the steric size of the hydroxyl group would help to produce an ap-isomer on heating. The ap isomer was detected but the population ratio ap⁄±sc was too small to isolate the ap.
Restricted Rotation Involving the Tetrahedral Carbon. L. Rotamer Distributions and Rotational Barriers in Some 9-(1-Methoxyethyl)triptycene Derivatives
Authors: Tanaka Yoshiyuki , Yamamoto Gaku , Oki Michinori 
Published: July 2006

Abstract
1,4-Dimethyl-and 1,2,3,4-tetrahalo-9-(1-methoxyethyl)triptycenes (halogen=F, Cl, and Br) were synthesized by reactions of 9-(1-methoxyethyl)anthracene with appropriate benzynes. Rotamer distributions and rotational barriers about the bridgehead-to-substituent bond were studied by NMR spectroscopy. Rotamer distributions are governed mainly by the steric effect; the major rotamer is assigned to sc*(S*), the minor one to ap, and the third one found only in the tetrafluoro derivative to sc*(R*). Rotational barriers are 21–23 kcal mol−1 which are slightly lower than those for the corresponding 9-isopropyltriptycenes.
Restricted Rotation Involving the Tetrahedral Carbon. LI. Electrostatic and Hydrogen Bonding Effects on the Rotamer Distribution in 1-Oxy-substituted 9-(1-Methoxyethyl)triptycenes
Authors: Yamamoto Gaku , Tanaka Yoshiyuki , Oki Michinori 
Published: July 2006

Abstract
1-Hydroxy-4-methoxy- (5) and 1,4-dimethoxy-9-(1-methoxyethyl)triptycenes (6) were obtained by the reaction of 9-(1-methoxyethyl)anthracene with p-benzoquinone followed by enolization and methylation. Rotamer equilibrium in 6 is principally governed by the electrostatic effects favoring the ap rotamer. In weakly proton-accepting chloroform-d, 5 exists as sc*(R*) and sc*(S*) rotamers with the former predominating, both of which contain a strong intramolecular hydrogen bonding between the 1-hydroxyl and the methoxyl group in the 9-substituent. In strongly proton-accepting dimethyl-d6 sulfoxide, all the three rotamers exist with the ap rotamer predominating. It is noteworthy that the sc*(R*) rotamer, which is present in 20% ratio in dimethyl sulfoxide, still retains the intramolecular hydrogen bonding in this solvent.
Synthesis and the Spectral Analysis of 4- and 6-[1-Acetamido-3-(3,4,5-trimethoxyphenyl)propyl]-2-methoxytropones(B-Ring-open Analogues of Colchicine)
Authors: Yamamoto Hiroshi , Hara Atsushi , Inokawa Saburo , Nozoe Tetsuo 
Published: July 2006

Abstract
The treatment of 4-[1-acetamido-3-(3,4,5-trimethoxyphenyl)propyl]tropolone with ethereal diazomethane gave the 6- and 4-substituted title compounds in 51 and 38% yields, respectively. The 270-MHz 1H-NMR spectral analysis performed on these compounds, colchicine, and two methyl ethers of hinokitiol permits unequivocal assignment of the position of the C-substituent on these 2-methoxytropone rings. Attempts were made to effect the direct B-ring closure of these intermediates and 4-[1-acetamido-3-(3,4,5-trimethoxyphenyl)propyl]-5-aminotropolone using various oxidizing reagents.
Carbon-13 Relaxation Times of Poly(vinylnaphthalene)s in Solution
Authors: Seki Kazuhiko , Imamura Yoshio 
Published: July 2006

Abstract
Carbon-13 spin-lattice relaxation times and nuclear Overhauser enhancement factors were measured at 25.03 MHz and 40 °C for a solution of poly(1-vinylnaphthalene)(P1VN) and poly(2-vinylnaphthalene)(P2VN). The backbone motions in P1VN and P2VN were characterized by a distribution of correlation times. The relative mobilities of P1VN, P2VN, and polystyrene were as follows: \barτpolystyrene&lt;\barτP2VN&lt;\barτP1VN for the average correlation times. These results were explained on the basis of the energy contour maps for polystyrene, P2VN, and P1VN.
Extractive Spectrophotometric Determinaton of Molybdenum(VI) with 8-Hydroxy-5-quinolinesulfonic Acid and Methyltrioctylammonium Chloride
Authors: Sugawara Masao , Uto Masayuki , Kambara Tomihito 
Published: July 2006

Abstract
Molybdenum(VI) complex with 8-hydroxy-5-quinolinesulfonic acid (H2qs) is reduced to the quinquevalent state by hydrazinium sulfate and extracted into chloroform as the ion-association complex with methyltrioctylammonium chloride(Q+Cl−). Molybdenum(VI) in the ppm range is determined spectrophotometrically. The composition of the extracted species was estimated to be [(MoO2qs)2(Hqs)3(Q)5].
Fluorescence as a Means for Kinetic Studies. III. Bimolecular Reaction of Fluorescent Reagent as Quenching Probes
Authors: Ushiki Hideharu , Okamoto Akio , Horie Kazuyuki , Mita Itaru 
Published: July 2006

Abstract
In order to study the rate of bimolecula reaction between 9-(3-aminopropyl)carbazole and dansyl chloride, the change of fluorescent intensity of dansyl group has been measured. It has been found that the rate of increase in fluorescent intensity of the dansyl group is equal to the rate of decrease in fluorescent intensity of the carbazolyl group during progress of this bimolecular reaction. Another quenching probe was also examined briefly.
Stereoselective Cross-Aldol Reactions of Silyl Enol Ethers with Acetals Catalyzed by Iodotrimethylsilane
Authors: Sakurai Hideki , Sasaki Koshi , Hosomi Akira 
Published: July 2006

Abstract
Iodotrimethylsilane catalyzes effectively erythroselective aldol type condensation of silyl enol ethers with acetals.
Reactivity of Aromatic o-Hydroxy Oximes. II. The Use of Esters of Aromatic o-Hydroxy Oximes in Peptide Synthesis
Authors: Hayashi Ikuo , Shimizu Kiyoshi 
Published: July 2006

Abstract
Esters of N-protected amino acids with o-hydroxybenzaldehyde oxime, o-hydroxyacetophenone oxime, o-hydroxybenzophenone oxime, and their 5-Cl and 5-NO2 derivatives were prepared by several methods. Various dipeptide derivatives with high purity were obtained in good yield by use of these active ester reagents.
Light-induced Redox Characteristics of [Tetrakis(4-methylpyridyl)porphyrinato]manganese(III)
Authors: Takahashi Koushin , Komura Teruhisa , Imanaga Hiroto 
Published: July 2006

Abstract
[Tetrakis(4-methylpyridyl)porphyrinato]manganese(III) (MnIII(tmpp)) undergoes reversible one-electron transfer reactions in aqueous solutions. The half-wave potential of MnIII/II(tmpp) redox couple is −0.21V (vs. 3.33 M KCl, AgCl/Ag) between pH 4 and 12. On the other hand, the half-wave potential of MnIV/III(tmpp) redox couple becomes less positive with increasing pH in alkaline solution. A small amount of methylviologen cation radical (MV.+) is built up by irradiating with visible light an alkaline solution containing MnIII(tmpp), methylviologen (MV2+), and sacrificial electron donors. The formation of MV.+ is attributed to either the reduction of photoexcited MnIII(tmpp) (*MnIII(tmpp)) with an electron donor or the oxidation of *MnIII(tmpp) with MV2+.
A Further ESR Study of Irradiated D2O Ice. On the Nature of the Species Appeared at g=2.08
Authors: Hase Hirotomo , Higashimura Takenobu 
Published: July 2006

Abstract
For D2O ice warmed at ca. 120 K after the irradiation at 77 K, “g=2.08 line” was isolatedly detected at 4 K. The intensity of the line increased for the sample containing an electron scavenger. Photobleaching of solvated electrons caused no change in the intensity of the line. In D2O single crystal, angular dependency of the line was not observed. The overall results were not accomodated to the hypothesis that “g=2.08 line” was due to O− radical, but rather indicated the possibility that the species is a sort of positive ion or trapped hole.
Mössbauer Studies of Mercury(II) Salt Adducts of [2]Ferrocenophane Derivatives
Authors: Watanabe Masanobu , Ichikawa Hajime , Motoyama Izumi , Sano Hirotoshi 
Published: July 2006

Abstract
Various adducts of mercuric salts with [2]ferrocenophane and 1,1,2,2-tetramethyl[2]ferrocenophane, were prepared by treating HgX2 (X=Cl−, I−, CN−) with the [2]ferrocenophane derivatives in ether. The adducts were studied by Mössbauer spectroscopy and other physicochemical measurements. Anomalously large quad-rupole splitting values of the adducts (about 3.10–3.30 mm s−1 at 78 K) suggest the presence of a strong direct interaction between the Fe and Hg atoms.