bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal Investigation of Nickel(II) Diamine Complexes in Solid State
Authors: De Goutam , Biswas Prasanta Kumar , Chaudhuri Nirmalendu Ray 
Published: July 2006

Abstract
Three tris(ethylenediamine)nickel(II) chloride dihydrate having identical composition, apparently similar in color, magnetic moment and spectral properties showed differences in thermal profile. Thermal investigations of [Ni(en)3]Br2·2H2O, [Ni(tn)3]Cl2·2H2O, and [Ni(tn)3]Br2·H2O where en=ethylenediamine and tn=1,3-propanediamine were carried out. Several bis and mono(diamine) complexes were synthesized in solid state from the corresponding tris complexes. All the bis and mono(diamine) complexes were found to be Oh hand Td symmetry respectively. All tris(diamine) complexes generate cis bis(diamine) species upon heating. But only one tris(ethylenediamine)nickel(II) chloride dihydrate generates cis bis species by the isomerization from the trans species temporarily formed. Monodiamine complexes decomposed through [Ni2(diamine)Cl4] species which showed unusually high magnetic moment. The probable mechanistic path for each step of decomposition was also reported.
Graphical Enumeration of the Sextet Polynomials. Novel Identities of Resonant Sextet Numbers of Cata-condensed Benzenoid Hydrocarbons
Authors: El-Basil Sherif 
Published: July 2006

Abstract
Novel graph-theoretical identities of resonant sextet numbers of certain nonbranched and branched cata-condensed benzenoid hydrocarbons are given, which are based on transforming Kekulé valence-bond structures into the subspace of their double bonds. Analytic expressions are given which allow construction of sextet polynomials of certain types of benzenoid hydrocarbons of very large sizes in a few seconds without drawing any graphs.
Wetting of Coal by Nonionic Surfactant and Mixtures of Nonionic and Anionic Surfactants
Authors: Esumi Kunio , Meguro Kenjiro , Honda Hidemasa 
Published: July 2006

Abstract
The rates of wetting of coals with various carbon contents by aqueous nonionic surfactants and mixtures of nonionic and anionic surfactants were examined. It was found that the wetting rate of each coal decreased with an increase of the length of oxyethylene chain in the nonionic surfactant. Further, the wetting rate of coal by anionic surfactant was enhanced by the addition of nonionic surfactant. This enhancement was most effective for coals with relatively low carbon content.
Distribution of Calcium Ion in the Crystal of MgTiO3–CaTiO3 System
Authors: Nagata Eiji , Tanaka Junzo , Tsutsumi Masayuki , Bannai Eisuke 
Published: July 2006

Abstract
The crystal of 0.96 MgTiO3–0.04 CaTiO3 was grown by a TSFZ method. The distribution of CaTiO3 in the crystal was analyzed by SEM and EPMA. The results obtained suggest that the change of dielectric properties of MgTiO3 by adding CaTiO3 results from the independent distribution of CaTiO3 in MgTiO3.
cyclo-Octasulfur in Swine Manure
Authors: Yasuhara Akio , Nagai Sumio , Fuwa Keiichiro , Jimbu Masayuki 
Published: July 2006

Abstract
Pale-yellowish white needles were isolated from a rotten mixture of swine urine and feces by vacuum distillation and identified to be cyclo-octasulfur by means of mass spectrometry and other methods. This is the first time that this compound has been detected in swine manure.
A Reinforced Oleophilic Anion-exchange Resin Membrane as a Sensitive Membrane of Anion-selective Electrodes
Authors: Jyo Akinori , Imato Toshihiko , Kohno Hirofumi , Ishibashi Nobuhiko 
Published: July 2006

Abstract
Based on an impregnation technique for the preparation of ion-exchange resin membranes, a simple way was proposed for the preparation of a reinforced oleophilic anion-exchange resin membrane as an anion-selective electrode membrane with a chemically fixed site. The resulting exchange resin membrane is thin (ca. 25 μm) and flexible. It gives anion-selective electrodes with high performances.
Metal Catalyzed Aquation of Tris(malonato)chromate(III)ion. Kinetics and Mechanistic Study
Authors: Basak Arup Kumar , Chatterjee Chinmoy 
Published: July 2006

Abstract
Metal ion catalyzed aquation of tris(malonato)chromate(III) ion has been followed spectrophotometrically in perchloric acid solution ([H+]=0.05 M) over a temperature range at an ionic strength of 2.0 M. Under these conditions kobsd=kH[H+]+kM[M2+] where kobsd is the observed first order rate constants for the protons and the metal ion catalyzed pathways. Metal ions exert appreciable catalytic effect on the aquation of the complex with kM following the sequence Cu(II)&gt;Ni(II)&gt;Co(II)&gt;Zn(II)&gt;Mn(II), which runs parallel to the metal monomalonato complex formation constants. A plausible mechanism for the metal promoted reactions is proposed.
Studies of Tritylated Pentoses and 6-Deoxyhexoses. III. The O-Tritylation of Methyl α- and β-d-Xylopyranoside
Authors: Otake Toshiki , Sonobe Toru 
Published: July 2006

Abstract
The tritylation of methyl α- and β-d-xylopyranoside afforded three isomeric trityl ethers in both cases. All the ethers were separated by column chromatography in almost pure forms on TLC. Among them, methyl 2-O-trityl-α- and methyl 3-O-trityl-β-d-xylopyranoside were crystallized from aqueous ethanol. The position of the trityl group in each ether was mainly established by the use of 1H NMR with its diacetyl derivative.
Condensations of 3,4-Bis(diphenylmethylene)-1,2-cyclobutanedione with o-Phenylenediamine under Ionic and Radical Reaction Conditions
Authors: Ro Zaiko , Tanaka Koichi , Toda Fumio 
Published: July 2006

Abstract
The title condensations under ionic and radical reaction conditions gave 1,2-bis(diphenylmethylene)-1,2-dihydrocyclobuta[b]quinoxaline and 7,8-bis(diphenylmethylene)-7,8-dihydrobenzo[b][1,4]diazocine-6,9(5H,10H)-dione respectively.
Synthesis of Cyclic Imines Having Conjugated Exocyclic Double Bond
Authors: Nomura Yujiro , Bando Takashi , Takeuchi Yoshito , Tomoda Shuji 
Published: July 2006

Abstract
Cyclic imines with conjugated exocyclic double bond have been synthesized by the reaction of 1-pyrrolinetrimer or 2,3,4,5-tetrahydropyridine trimer with various aldehydes in methanol in moderate to decent yields.
Spectrofluorimetric Determination of Zirconium in Hafnium Metal with Salicylic Acid and Rhodamine B after Its Separation Using Chloroacetic Acid and Salicylic Acid
Authors: Ramakrishna T V , Subramanian M S 
Published: July 2006

Abstract
A spectrofluorimetric method is described for the determination of 2 to 16 μg of zirconium based on the formation of an ion-association complex with salicylic acid and Rhodamine B. Hafnium behaved similarly to zirconium, but the interference can be overcome by selective extraction of zirconium at pH 1.4–1.6 from 1 mol dm−3 chloroacetic acid medium into 0.3 mol dm−3 solution of salicylic acid in 2:3 mixture of isobutyl methyl ketone (IBMK) and chloroform. The spectrofluorimetric method in conjunction with the separation procedure has been used for the determination of 4.4 to 14.5% of zirconium in hafnium metal.
Conformational Analysis of Terphenyls by Photoelectron Spectroscopy
Authors: Kobayashi Tsunetoshi 
Published: July 2006

Abstract
Vapor phase HeI photoelectron spectra of o- and m-terphenyl were measured, and conformational analysis of biphenyl, o-, m-, and p-terphenyl was made by comparing the observed photoelectron spectral patterns with the calculated ones by the CNDO/S method, the inter-ring twist angles in these compounds being estimated to be around 40°, 60°, 40°, and 40°, respectively. The result that the inter-ring twist angles in o-terphenyl are far smaller than 90° is completely in contrast to the long believed perpendicular model of o-terphenyl suggested by the gas electron diffraction study.
Liquid Crystal Formation in Binary Systems. VIII. Induction of Smectic Phases by the Addition of 4-Alkoxynitrobenzene or 4-Alkoxybenzonitrile to N-(4-Propoxybenzylidene)-4-hexylaniline
Authors: Chino Eiji , Matsunaga Yoshio 
Published: July 2006

Abstract
When 4-alkoxynitrobenzenes are mixed with N-(4-propoxybenzylidene)-4-hexylaniline, smectic A phases which are not found with the component compounds, are produced. The liquid crystals are stable if the number of carbon atoms in the alkoxyl group is eight or more, the maximum temperature being 49 °C with dodecyloxyl group, but they are entirely metastable if the number of carbon atoms is six or less. The extrapolation of the partly-observed smectic A-isotropic transition point curve indicates that 4-(dodecyloxy)nitrobenzene has a latent transition point at about −25 °C and that all the examined p-disubstituted benzenes are potentially smectogenic. Smectic A phases are also induced by the addition of 4-alkoxybenzonitriles to the above Schiff base. The transition to the induced mesophase is enantiotropic when the alkoxyl group is decyloxyl or dodecyloxyl. The replacement of the propoxyl group in the Schiff base with an ethoxyl group makes the induced smectic A phases thermally less stable. The change is drastic when the alkoxyl group in the p-disubstituted benzene is hexyloxyl or shorter.
Salt Effect on the Solubility of Copper and Beryllium Chelates of 4,4,4-Trifluoro-1-phenyl-1,3-butanedione
Authors: Yoshimura Yasuki , Sato Nobuyoshi , Kikuchi Makoto 
Published: July 2006

Abstract
In order to examine whether the substitution of a trifluoromethyl group for a methyl group in metal chelates of 1-phenyl-1,3-butanedione (BA) affects the salt effect on the solubility of these chelates, the solubility of copper and beryllium chelates of 4,4,4-trifluoro-1-phenyl-1,3-butanedione (BFA) in water and in some aqueous salt solutions was measured at 25 °C. The solubility in water (S0) was 9.07±0.22×10−7 mol dm−3 for the copper chelate and 4.85±0.08×10−6 mol dm−3 for the beryllium chelate. These solubility values are compared with those of the corresponding BA chelates and an influence of fluorination on the solubility of these BA chelates is discussed. It was found that the solubility of the above BFA chelates in the aqueous salt solutions (S) could be expressed satisfactorily by the equation, log(S0⁄S)=a\sqrtCs+bCs, where Cs is the concentration of salt. This result suggests that introduction of CF3 group brings about a specific interaction between the fluorinated chelates and their surroundings.
Bis(2-aminoethanol)cadmium(II) Tetracyanonickelate(II)-Pyrrole (1/1) and 2-Aminoethanolcadmium(II) Tetracyanonickelate(II)-Benzene (1/2). Variation of Metal Complex Host Structure with the Size of Aromatic Guest Molecule
Authors: Nishikiori Shin-ichi , Iwamoto Toschitake 
Published: July 2006

Abstract
Two modifications of the host structures analogous to that of Hofmann-type Cd(NH3)2Ni(CN)4 have been found in the crystal structures of Cd(mea)2Ni(CN)4·C4H5N and Cd(mea)Ni(CN)4·2C6H6 which were prepared using mea (2-aminoethanol=monoethanolamine) in place of the NH3 as the ligands in the host metal complexes. In the former pyrrole clathrate, Hofmann-mea-type(1), the mea behaves as a unidentate ligand like the NH3 in Hofmann-type, but in the latter benzene one, Hofmann-mea-type(2), it behaves ambidently like the en in Hofmann-en-type host Cd(en)Ni(CN)4. In Hofmann-mea-type(1) host, the layered metal cyanide network is puckered, whereas that in Hofmann-ema-type(2) host is coplanar. The size of the guest molecule appears to control the behavior of mea and the structure of the metal cyanide network.
Synthesis and Characterization of a New Quinquedentate Ligand Consisting of Salen Skeleton and Phenolic Tail Capable of Axial Coordination and Its Metal Complexes
Authors: Kanda Wakako , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
A New quinquedentate ligand N,N′-disalicylidene-2-methyl-4-(2-hydroxy-5-methylphenyl)-1,2-butanediamine (H2(sal-Hpen)) has been prepared, which is a salen derivative containing a phenolic tail capable of axial coordination. It formed the complexes of a general formula [M(sal-Hpen)] with copper(II), nickel(II), and cobalt(II) ions. Based on infrared, electronic and ESR spectra, the complexes were revealed to assume a planar coordination, free from axial coordination of the phenolic tail. On the other hand, distorted octahedral cobalt(III) and tetragonal pyramidal iron(III) complexes, [Co(sal-pen)py] and [Fe(sal-pen)], were obtained, where sal-pen3− acts as a quinquedentate ligand.
An X-Ray Diffraction Study on the Structures of Bis- and Tris(ethylenediamine)copper(II) Complexes in Solution
Authors: Fujita Tadao , Ohtaki Hitoshi 
Published: July 2006

Abstract
The structure of copper(II) complexes with ethylenediamine (en) in solution has been determined by means of X-ray diffraction. The measurements were performed at 25 °C for aqueous ethylenediamine solutions of copper(II) nitrate, the mole ratio (en/Cu) in the solutions being 2.09 and 5.14. In the former solution the bis(ethylenediamine)copper(II) complex was contained as the main species, while the tris(ethylenediamine)copper(II) complex was predominantly formed in the latter solution. The analysis of the X-ray scattering data of the solutions showed that in the bis-complex four nitrogen atoms of the two ethylenediamine molecules coordinated to the central metal ion at the distance of 1.93 Å in a planar form and oxygen atoms of two water molecules were located at 2.92 Å above and below the plane. Since the axial Cu–OH2 bond distance is very long, the structure of the bis-complex can be regarded as square-planar. In the tris-complex the equatorial Cu–N bond length was 1.92 Å, which was practically the same as that within the bis-complex. The axial Cu–N distance was 2.22 Å.
A Calorimetric Study on the Relative Thermal Stabilities of Some Cobalt(III)–Ammine Complexes in Solid Phase
Authors: Tsuchiya Ryokichi , Uehara Akira , Nakayama Takashi 
Published: July 2006

Abstract
The enthalpy changes (ΔH) in the reaction of [CoXn(NH3)6−n]X3−n type complexes with an alkaline sodium sulfide solution were calorimetrically measured at 25 °C, where X is Cl−, Br−, I−, NO3−, or ClO4−. The thermal stabilities were found to decrease in the following orders: in the hexaammine series, chloride&gt;bromide&gt;nitrate&gt;iodide&gt;perchlorate; in the pentaammine series, chloride&gt;bromide&gt;nitrate; and in the trans-tetraammine series, chloride&gt;bromide and chloro&gt;bromo complexes. In addition, in the tetraammine series, the possibility of trans-to-cis isomerization, which has actually been observed, was reasonably explained on the basis of the difference in lattice energies between trans- and cis-[CoCl2(NH3)4]Cl.
Extended X-Ray Absorption Fine Structure Studies in Some Aqueous Copper(II) Solutions
Authors: Sano Mitsuru , Maruo Tetsuya , Yamatera Hideo 
Published: July 2006

Abstract
With a laboratory EXAFS apparatus consisting of a usual X-ray generater, an LiF crystal, and a position sensitive X-ray detector with a self-scanning photodiode array, EXAFS spectra were obtained for aqueous [Cu(NH3)4]SO4, [Cu(en)2]Cl2 (en=ethylenediamine), and CuSO4 solutions. By reference to similar spectra of the corresponding crystals, the solution spectra were analyzed by the curve-fitting method. The values obtained for the distances between the metal and its first-shell atoms in the ammine and sulfate solutions are 2.03 (±0.02) and 1.98 (±0.03) Å, in accordance with those derived from the X-ray diffraction experiments. The Cu–N distance of [Cu(en)2]2+ in solution is 2.02 or 2.04 (±0.02) Å. These values obtained for the solutions are very close to those of corresponding solid complexes.
The Crystal and Molecular Structure of [Pd(tfac)(tfac-O){P(o-tolyl)3}] Containing an O-Unidentate 1,1,1-Trifluoro-2,4-pentanedionate Anion as a Ligand
Authors: Ooi Shun’ichiro , Matsushita Toshio , Nishimoto Kichisuke , Okeya Seichi , Nakamura Yukio , Kawaguchi Shinichi 
Published: July 2006

Abstract
The title complex crystallizes in the monoclinic space group C2/c with a=24.900(6) Å, b=8.272(2) Å, c=30.437(9) Å, and β=97.23(2)°. The structure analysis, which converged at R=0.061 and Rw=0.083 with 3017 reflections for which Fo2&gt;3σ(Fo2), showed that the palladium has a complete square-planar coordination geometry. While one of the tfac ligands is chelating, the other is bound to the metal only through the carbonyl oxygen adjacent to CH3. The O-unidentate tfac ligand lies trans to the CF3CO moiety of chelating tfac and has a planar structure in which the dangling CF3CO group is situated trans to the bonding oxygen atom with respect to the C=C bond. The ab initio MO calculation for the Z,Z-form of the tfac anion indicated that the coordination ability of the acetyl oxygen is higher than that of the trifluoroacetyl oxygen in consistence with the observed structure.
Pressure Dependence of Carboxypeptidase A Action
Authors: Fukuda Mitsuhiro , Kunugi Shigeru , Ise Norio 
Published: July 2006

Abstract
The effect of pressure on the peptide hydrolysis by carboxypeptidase A and its inhibition by several substrate-analogs were investigated. The activation volumes for kcat were −4 and −8 ml mol−1 for the hydrolysis of 3-(2-furyl)acryloyl–Gly–l-Phe and 3-(2-furyl)acryloyl–l-Phe–l-Phe, respectively. The reaction volumes for the binding process (ΔVass) for these dipeptide substrates and for the competitive inhibitors of the peptide hydrolysis (peptide-like inhibitors), such as Gly–l-Tyr and l-Phe, were about 30 ml mol−1. In contrast, ΔVass values for 3-phenyllactate and l-mandelate, both of which are classified as the noncompetitive inhibitors for the peptide hydrolysis (ester-like inhibitors), were comparably small, 5 and 6 ml mol−1, respectively. Furthermore the pressure dependence of the inhibition by d-Phe or d-mandelate was largely different from that of the corresponding l-form; namely ΔVass for d-Phe was 4 ml mol−1 and that for d-mandelate was 21 ml mol−1. The pH dependence of the inhibition constant was classified into two groups; Gly–l-Tyr and l-Phe inhibited more strongly at higher pH while 3-phenyllactate and others did more effectively at lower pH. Taking into account the previously published result of the X-ray crystallographic studies (e. g., J. A. Hartsuck and W. N. Lipscomb, “The Enzymes,” 3rd ed, ed by P. D. Boyer, Academic Press, New York (1971), Vol. 3, p. 1), the present results were accounted for in terms of two different (electrostatic) interactions between the substrate or inhibitor and the active site of the enzyme.
The Reaction of Cyanoguanidine with Formaldehyde. I. Hydroxymethylation and Methoxymethylation of Cyanoguanidine
Authors: Takimoto Michiaki , Ebisuno Toichi , Shiba Ryuichi 
Published: July 2006

Abstract
In order to examine the reactivity of cyanoguanidine (CG) with formaldehyde, CG was first hydroxymethylated, then methoxylated, and finally exhaustively hydroxymethylated with a large excess of formaldehyde. 4-Cyanoimino-3-methoxymethylperhydro-1,3,5-oxadiazine was isolated as a major reaction product of 1,3-bis(methoxymethyl)-2-cyanoguanidine with formaldehyde. This product is an adduct of 3 mol of formaldehyde per mole of CG and a six-membered cyclic ether. Minor products were further methoxylated and 3,5-bis(methoxymethyl)-4-methoxymethyl(carbamoylimino)perhydro-1,3,5-oxadiazine was isolated. This is an adduct of 2 mol of formaldehyde to the amidinated product derived from the major product by the hydration of the cyano group. The ring structure of perhydro-1,3,5-oxadiazine was so stable that it could not be decomposed under acidic conditions if the methoxymethyl groups were fully acid-hydrolyzed.
Studies on the β-Turn of Peptides. VI. Nuclear Magnetic Resonance Study on the Conformations of N-(2,4-Dinitrophenyl)tetrapeptide p-Nitroanilides Related to the β-Turn Part of Gramicidin S
Authors: Higashijima Tsutomu , Sato Kazuki , Nagai Ukon 
Published: July 2006

Abstract
The conformations of N-(2,4-dinitrophenyl)-l-Leu–X–l-Pro–l-Val p-nitroanilides (I, X=D-Ala; II, X=Gly; III, X=l-Ala) were studied by nuclear magnetic resonance and circular dichroism spectroscopies. The l-Val-NH group of compound I takes part in an intramolecular hydrogen bonding, and the folded conformation is considered to be type II′ β-turn structure as in the case of [d-Ala4,4′]-gramicidin S. The populations of β-turn conformer were considered to be in the order of I&gt;II&gt;III≈0 in methanol and N,N-dimethylformamide solutions, and decreased in dimethyl sulfoxide solution. Compound II in dimethyl sulfoxide and III in all the three solvents do not take a β-turn conformation. The data obtained from NMR and CD experiments showed a good correlation between the magnitudes of the Cotton effects (250–400 nm) and the populations of the β-turn conformation of these peptides. The proximity of the two chromophores was ascertained directly for compound I in N,N-dimethylformamide solution by nuclear Overhauser effects experiment. In addition, the β-turn preference of these peptides were in good accordance with the antibiotic activities of the gramicidin S analogs having the same tetrapeptide sequences at their β-turn parts.
Reactions of 3-Acetyltropolone and Its Methyl Ethers with 1,2-Ethanediamines
Authors: Sudoh Yasunori , Onitsuka Katsunobu , Imafuku Kimiaki , Matsumura Hisashi 
Published: July 2006

Abstract
3-Acetyltropolone reacted with 1,2-ethanediamine to give N,N′-bis(3-acetyl-2-oxo-3,5,7-cycloheptatrienyl)-1,2-ethanediamine (3) and 5-acetyl-3,4-dihydro-2H-cyclohepta[b]pyrazine (4), along with a small amount of by-products, which were 8-acetyl-1,2,3,4-tetrahydro-5-quinoxalinecarbaldehyde (5), 5-acetyl,2,3,4-tetrahydroquinoxaline (6), and 2-methyl-5,6-dihydro-4H-pyrrolo[1,2,3-de]quinoxaline (7). The minor products (5–7) resulted from the contraction of the seven-membered ring of the compound 4. 2-Acetyl-7-methoxytropone (2a) also reacted with 1,2-ethanediamine to give the same products (3–7) in higher yields. On the other hand, the same reaction of 3-acetyl-2-methoxytropone (2b) readily gave 4–7. The reaction of 2a with N-methyl-1,2-ethanediamine gave N-(3-acetyl-2-oxo-3,5,7-cycloheptatrienyl)-N′-methyl-1,2-ethanediamine (14), 5-acetyl-1-methyl-2,3-dihydro-1H-cyclohepta[b]pyrazine (15), 8-acetyl-4-methyl-1,2,3,4-tetrahydro-5-quinoxaline-carbaldehyde (16), 5-acetyl-1-methyl-1,2,3,4-tetrahydroquinoxaline (17), and 2,6-dimethyl-5,6-dihydro-4H-pyrrolo[1,2,3-de]quinoxaline (18). The same reaction of 2b also gave the products (15–18). The several reactions of these products are also described.
Phosphorescence Studies of 3ππ* Benzaldehyde, Acetophenone, and 1-Indanone in Benzoic Acid Host
Authors: Nagaoka Shin-ichi , Hirota Noboru 
Published: July 2006

Abstract
We have made a vibrational analysis of the phosphorescence spectra of benzaldehyde, deuterated benzaldehydes, acetophenone, and 1-Indanone in benzoic acid host. The emissions coming from different sites of benzaldehyde were separated with the help of microwave induced delayed phosphorescence (MIDP) spectroscopy. From the phosphorescence excitation spectra the locations of the 3nπ* states were estimated to be about 2000 cm−1 above the 3ππ* states. Contrary to the previous assignment, it was found that the aldehyde H wag is active in the spectra of benzaldehyde as in the cases of other host. The spectra of acetophenone and 1-indanone are similar to those obtained in other hosts, although the 0-0 bands are relatively stronger. The C=O stretching mode is, however, not clearly observable in all the systems studied here, suggesting that this mode is not active in the spectra of nearly pure 3ππ* aromatic carbonyls. The main radiative mechanisms are discussed based on the present results and are compared with those of other aromatic carbonyls. Possible effects of hydrogen bonding on these properties are discussed.
Synthesis and Properties of Novel Type Binuclear Copper(II) Complexes Whose Coordination Units Are Linked by a Flexible Polyatomic Chain
Authors: Takahashi Kazuhiro , Nishida Yuzo , Kida Sigeo 
Published: July 2006

Abstract
Binuclear copper(II) complexes with two bis(2-benzimidazolylmethyl)amine moieties linked by a flexible polyatomic chain were prepared. Their ESR spectral properties were highly dependent on the bridging chains linking two coordination units.