bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Fas ligand as a cell death factor and signal transducer
Authors: Linkermann Andreas , Qian Jing , Kabelitz Dieter , Janssen Ottmar 
Published: October 2003

AbstractFas ligand (FasL, CD95L) is the key death factor of receptor‐triggered programmed cell death in immune cells. FasL/Fas‐dependent apoptosis plays a pivotal role in activation‐induced cell death, termination of immune responses, elimination of autoreactive cells, cytotoxic effector function of T and NK cells and the establishment of immune privilege. Dysregulation of FasL‐expression has severe impact on the maintenance of immune homeostasis and defense and is often associated with pathophysiology. Moreover, it was recently shown that FasL serves as a costimulatory receptor during T cell activation. However, it is still not known whether FasL‐ligation induces a ‘direct’ signal or whether the regulation of activation signals is a more ‘indirect’ result of alterations in intracellular protein‐protein‐interactions. In the latter scenario, the proline rich domain of FasL was shown to be required for a directed transport and localization of FasL. Over the past years, potential FasL‐associating molecules were identified which mostly bind via Src homology 3 or WW domains to the proline rich domain of FasL. This review summarizes facts and hypotheses about these FasL‐interacting proteins. It reflects their potential role in reverse signal transduction and FasL biology in T lymphocytes and other cell types.
Interleukin‐4‐ and Interleukin‐13 receptors trigger distinct JAK/STAT activation patterns in mouse lymphocytes
Authors: Friedrich Karlheinz , Brändlein Stephanie , Ehrhardt Ingrid , Krause Sebastian , Luttmann Werner 
Published: October 2003

AbstractInterleukin‐13 (IL‐13) is a T‐cell‐derived cytokine closely related to IL‐4 and functions as a central mediator of allergic asthma. The basis of overlapping activities of the two cytokines is the utilization of a common receptor subunit, the interleukin‐4 receptor α chain (IL‐4Rα). We addressed the signaling specificity of IL‐4 versus IL‐13, which rests on specific components of the respective receptor systems, i.e. the common γ chain (γc) for the IL‐4 receptor and the IL‐13 receptor α1 chain for the IL‐13 receptor. Hybrid receptors were engineered such that the consequences of intracellular pairing between IL‐4Rα and its two different dimerization partners could be directly compared in a background‐free fashion in mouse pro‐B cells. Experimentally induced dimers of both the IL‐4Rα/γc and the IL‐4Rα/IL‐13Rα1 type were capable of mediating a proliferative response and triggering STAT6 activity. Other JAK/STAT reactions, however, appeared characteristically distinct in the two systems. The IL‐4 receptor, upon activation, drove tyrosine phosphorylation of JAK1 and JAK3, whereas the IL‐13 receptor did not activate JAK3. Notably, only the IL‐4‐ but not the IL‐13 receptor was competent to evoke DNA‐binding activity of STAT5.
Synthesis of marine guanidine alkaloids and their application as chemical/biological tools
Authors: Nagasawa Kazuo , Hashimoto Yuichi 
Published: October 2003

AbstractPtilomycalin A and crambescidins, novel marine guanidine alkaloids, have a unique pentacyclic guanidine structure, and exhibit a considerable array of biological activities. The first method developed for the synthesis of the pentacyclic guanidine core structure involved successive 1,3‐dipolar cycloaddition reactions and resulted in the first total synthesis of crambescidin 359. The synthesis of other pentacyclic guanidine derivatives has been based on this methodology and applied as tools for studying biological activities, and as chemical reaction catalysts. © 2003 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 3: 201–211; 2003: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.10064
Organic supramolecular architectures and their sol‐gel transcription to Silica nanotubes
Authors: Jung Jong Hwa , Shinkai Seiji , Shimizu Toshimi 
Published: October 2003

AbstractThe design of artificial models of “biomineralization” processes that utilize sol‐gel polymerization has led to a merging of inorganic materials research and supramolecular organic chemistry. This article introduces self‐assembled superstructures of sugar‐integrated and crown‐appended cholesterol gelators, which are used as versatile building blocks in organogels and as templates for sol‐gel transcription. This article focuses on the use of self‐assembled organic superstructures in the creation of novel inorganic materials with controlled morphologies. © 2003 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 3: 212–224; 2003: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.10065
Elemental composition of marine sponges from the Berlengas natural park, western Portuguese coast
Authors: Araújo Maria Fátima , Conceição Ana , Barbosa Teresa , Teresa Lopes Maria , Humanes Madalena 
Published: October 2003

AbstractAnalytical studies of sponges have recently become a matter of interest, since these organisms have been reported to accumulate high levels of some elements, including heavy metals, which may have an anthropogenic origin, allowing their application as environmental pollution indicators. In the present work, 35 sponges collected in August 1998 at the Berlengas Natural Park were classified and analysed by secondary target energy‐dispersive x‐ray fluorescence spectrometry (EDXRF). Some major, minor and trace elements could be determined: Al, Si, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Br, Rb, Sr, Zr, I and Pb. To assess some local influences on the sponge composition, two sediment samples were also taken from the area and analysed. Besides these elements, sponges are constituted by fairly high percentages of elements that do not emit characteristic x‐ray lines. Therefore, absorption corrections for quantitative calculations were carried out taking into account the ratio between the inelastic and elastic scattered incident radiation from a silver secondary target to calculate the mean atomic number of the light matrix. Calibration was performed using chemical compounds and standard reference materials. Precision, accuracy and detection limits for the range of elements determined by the method are particularly suitable for the chemical analysis of these organisms. Results for the sediment chemical composition indicated the existence of high Ca and low Si levels and confirmed the absence of any trace metal contamination in the region. The sponge composition showed low Si contents, even in siliceous specimens. Certain high elemental contents determined in some species indicated a clear selective bioaccumulation of particular trace elements, such as Ni, Zn and As, which is not dependent on local influences. Copyright © 2003 John Wiley & Sons, Ltd.
Investigation of interactions of nano‐particles within cells using micro‐beam imaging techniques
Authors: Ishihara Ryoko , Ide‐Ektessabi Ari , Kitamura Norio , Fujita Yoshikazu , Mizuno Yutaka , Ohta Tatsuro 
Published: October 2003

AbstractA new approach was employed to investigate the interactions between cells and metal ions at the single cell level. Mouse macrophages were cultured and exposed to solutions with different concentrations of metals and exposure times. A focused beam from a synchrotron radiation source and an electron probe microanalyzer were used for elemental imaging of the cells. It was found that the intensity and distribution of the matrix elements in a single cell are closely related to the uptake of metals. Furthermore, the variation of the density the matrix elements and their localization in the cell are influenced by the uptake of metals. Copyright © 2003 John Wiley & Sons, Ltd.
Determination of trace elements in Mycobacterium fortuitum by x‐ray fluorescence spectrometry
Authors: Gresits I. , Könczöl K. 
Published: October 2003

AbstractUsing energy‐dispersive x‐ray fluorescence analysis with an 125I ring source, it was possible to determine the concentration of several elements, such as Mn, Fe, Cu, Zn, Br, Rb and Sr, at the µg g−1 level in a microorganism (Mycobacterium fortuitum) and in nutrient medium. It was observed that the bacteria always incorporated a fixed amount of a given element even if the concentration in the nutrient medium was different. It was possible to contaminate the cells also with Zr. The sample preparation and irradiation process developed is a non‐destructive microorganism analytical method, as about 70% of the bacteria survived the measuring process. Copyright © 2003 John Wiley & Sons, Ltd.
On the response function of solid‐state detectors, based on energetic electron transport processes
Authors: Papp Tibor 
Published: October 2003

AbstractIn studies of the response function of state‐of‐the‐art Si(Li) and HPGe detectors to low‐energy (2–20 keV) mono‐energetic x‐rays, various characteristic features have been observed. To trace their origin we have studied the effect of the signal processing electronics on the evolution of the electronic signal, and measured the spectral shape of energetic electrons originating from the surfaces of Si and Ge crystals and front contact materials, using a high‐energy range electrostatic electron spectrometer. From the measured electron spectra leaving the surfaces of the detector and front contact materials, and from the details of electron transport processes, the origin of the distinct features is identified and an approximate analytical form for the representation of the detector response function has been derived. It gives an excellent description of the response function and may replace the frequently applied Hypermet function. On the basis of this study, an explanation is given of the origin of the exponential tail and other various discrete structures on the low‐energy side of the primary peak. The difference in low‐energy side tailing between Si and HPGe detectors is explored. A detailed analysis of the so‐called dead layer concept is given. Characteristic structures, ‘kinks’, are predicted in the spectra measured by solid‐state detectors. Copyright © 2003 John Wiley & Sons, Ltd.
Syntheses, Structures and Magnetic Properties of Three New Extended Iron‐containing Heteropolytungstates
Authors: Yang Wen‐Bin , Lu Can‐Zhong , Lin Xiang , Zhuang Hong‐Hui 
Published: October 2003

AbstractThree new extended iron‐containing heteropolytungstates were synthesized and structurally characterized: K6[{FeII(H2O)4}2(H2W12O42)]·15H2O (1), Na5[{Fe(H2O)3}2{Fe(H2O)4}0.5(H2W12O42)]·30H2O (2) and (H3O)+2[{Fe(H2O)4Fe(H2O)3}2(H2W12O42)]·20H2O (3). 1 and 3 crystallize in the monoclinic system, space group P21/n with a = 14.9967(5), b = 10.3872(3), c = 18.8237(6)Å, β = 93.407(1)°, V = 2927.1(2)Å3 and Dc = 4.151 g cm—3 for 1, and space group P21/c with a = 12.1794(4), b = 22.4938(4), c = 11.6941(3) Å, β = 105.731(2)°, V = 3083.7(1) Å3, and Dc = 4.043 g cm—3 for 3. 2 is triclinic, space group P1¯, with a = 12.121(2), b = 12.426(3), c = 13.247(3)Å, α = 68.33(3), β = 71.33(3), γ = 71.44(3)°, V = 1710.7(6)Å3 and Dc = 3.735 g cm—3. In all cases, the structures are based on paradodecatungstate polyoxoanions, which are linked by iron ions into chains, layers and a three‐dimensional structure for 1, 2 and 3, respectively.
Copper(II) Complexes with N, N'‐Bis(picolinidene‐N‐oxide)‐2‐hydroxy‐1, 3‐diaminopropane: Designing Binuclear Entities and Helical Chains by Versatile Ligand
Authors: Cheng Peng , Zhang Lei Z. , Bu Wei‐Ming , Peng Jiu‐He , Yan Shi‐Ping , Liao Dai‐Zheng , Jiang Zong‐Hui 
Published: October 2003

AbstractThree novel copper(II) complex [Cu2(bpa)(μ‐PhCO2)](ClO4)2 (1), [Cu2(bpa) (μ‐pyz)](ClO4)2 (2), and [Cu(Hbpa)](ClO4)2·2CH3CN (3) have been synthesized by the reaction of Hbpa with Cu(ClO4)2·6H2O in the presence and absence of exogenous ligands (where Hbpa = N, N'‐bis(picolinidene‐N‐oxide)‐2‐hydroxy‐1, 3‐diamino‐propane). Molecular structures of these compounds have been elucidated by single crystal X‐ray diffraction. 1 and 2 are both binuclear complexes in which two copper atoms are linked by the endogenous alkoxide oxygen and the exogenous benzoate and pyrazolate ligands, respectively. 3 consists of a one‐dimensional polymeric structure, in which Hbpa functions as a bridging mode.
Synthese von Oxovanadium(V)‐halogeno‐Komplexen der tripodalen Sauerstoffliganden LR— = [η5‐(C5H5)Co{PR2(O)}3]—, R = OMe, OEt
Authors: Kläui Wolfgang , Schäfer Stefan , Wunderlich Hartmut 
Published: October 2003

AbstractDurch Umsetzung der Natriumsalze der tripodalen Sauerstoffliganden LR— = [η5‐(C5H5)Co{PR2(O)}3]— (R = OMe, OEt) mit den Oxovanadiumtrihalogeniden V(O)F3 und V(O)Cl3 lassen sich stabile Verbindungen der allgemeinen Zusammensetzung [V(O)X2LR] synthetisieren. Versuche, den analogen Bromokomplex [V(O)Br2LOMe] durch Halogenidaustausch an den Komplexen [V(O)Cl2LOMe] und [V(O)F2LOMe] darzustellen, führten zu der Verbindung [VO(LOMe)2][V(O)Br4].Die Kristallstruktur der Verbindung [V(O)Cl2LOMe] wurde bestimmt. Der Komplex kristallisiert monoklin in der Raumgruppe P21/n mit a = 9.6332(8), b = 15.0312(11) und c = 15.3742(12)Å, β = 100.181(8)°. Die Koordination des Vanadiumatoms ist oktaedrisch.
Synthesis and Crystal Structure of Hexakis(N—allylthiourea)tetracopper(I) Tetratrifluoromethanesulfonate, [Cu4{CH2=CHCH2NHC(S)NH2}6](SO3CF3)4
Authors: Olijnyk V. V. , Filinchuk Ya. E. , Pandiak N. L. 
Published: October 2003

AbstractHexakis(N—allylthiourea)tetracopper(I) Tetratrifluoromethanesulfonate, [Cu4{CH2=CHCH2NHC(S)NH2}6](CF3SO3)4 (sp.gr.P21/n, a = 13.5463(8), b = 24.129(2), c = 19.128(1)Å, β = 108.053(6)°, Z = 4, R = 0.0440 for 13548 unique reflections) was obtained by reduction of Cu(CF3SO3)2 with excess of N—allylthiocarbamide in benzene medium. Four crystallographical independent Cu atoms possess trigonal environment of three S atoms of CH2=CHCH2NHC(S)NH2 moiety and form Cu4S64+ adamantane—like fragments. The latteres are connected with CF3SO3— anions via (C)—H···F hydrogen bonds.
Syntheses and Crystal Structures of Three Polymeric Silver(I) Terephthalate Complexes with Organic N‐Donor Ligands: [Ag(pren)]2(tp)·2H2O, [Ag(en)][Ag(μ2‐tp)]·H2O, and [Ag2(μ4‐tp)(apy)2]
Authors: Zhu Hai‐Liang , Liu Xiu‐Ying , Wang Xian‐Jiang , Yang Feng , Usman Anwar , Fun Hoong‐Kun 
Published: October 2003

AbstractThree polymeric silver(I) complexes with terephthalate anions as counterions or ligands, [Ag(pren)]2(tp)·2H2O (1), [Ag(en)][Ag(μ2‐tp)]·H2O (2), and [Ag2(μ4‐tp)(apy)2] (3) (where pren = 1, 2‐propylenediamine, tp =terephthalate dianion, en = ethylenediamine, and apy = 2‐aminopyridine) were synthesized and characterized by X‐ray single crystal analysis and infrared spectroscopy. 1 crystallizes in the monoclinic space group P211/c with a = 11.3221(5), b = 7.1522(3), c = 14.8128(5)Å, V = 1015.77(7)Å3, β = 122.132(2), and Z = 2. 2 crystallizes in the orthorhombic space group Pnma with a = 9.6144(6), b = 11.3465(7), c = 11.4810(7)Å, V = 1252.5(1)Å3, and Z = 4. 3 crystallizes in the monoclinic space group P21/n with a = 8.2003(5), b = 5.8869(4), c = 18.3769(11)Å, β = 92.593(1), V = 886.2(1)Å3, and Z = 4. Terephthalate dianions are not coordinated to the metal atoms in 1, but act as a μ2‐bridging ligand in 2 and as a μ4‐bridging ligand in 3.
The First Sodium Uranyl Chromate, Na4[(UO2)(CrO4)3]: Synthesis and Crystal Structure Determination
Authors: Krivovichev Sergey V. , Burns Peter C. 
Published: October 2003

AbstractThe first sodium uranyl chromate, Na4[(UO2)(CrO4)3], has been obtained by high‐temperature solid‐state reaction. The structure (triclinic, P1¯, Z = 2, a = 7.1548(3), b = 8.4420(3), c = 11.5102(5)Å, α = 80.203(1)°, β = 79.310(1)°, γ = 70.415(1)° V = 639.24(4)Å3 ) has been solved by direct methods and refined on the basis of F2 for all unique reflections to R1 = 0.024 [calculated on the basis of 4374 unique observed reflections (‖Fo‖ 4σF)]. The structure is based on chains of composition [(UO2)(CrO4)3] that are parallel to [1¯01]. The chains contain UrO5 pentagonal bipyramids (Ur = Uranyl) that share all equatorial corners with CrO4 tetrahedra. Cr(1)O4 and Cr(3)O4 tetrahedra bridge between two adjacent UrO5 bipyramids, whereas Cr(2)O4 tetrahedra share one corner with one UrO5 bipyramid each. The [(UO2)(CrO4)3] chains are planar and oriented parallel to (313). The Na+ cations provide linkage of the chains in the structure.
Electrochemical Synthesis of Tricyanomethyl Copper Complexes
Authors: Kamte M. Fotsing , Baumeister U. , Schäfer W. 
Published: October 2003

AbstractThe synthesis of tricyanomethyl copper complexes has been achieved by anodic dissolution of a sacrificial copper metal and cathodic reduction of 1, 1, 3, 3‐tetracyanopropane in acetonitrile, in the presence of triphenylphosphane used as coligand. The electrogenerated tetracyanopropyl radical anion is not stable and undergoes a cleavage leading to the tricyanomethyl anion and acrylonitrile which is electropolymerized at the cathode. The reaction solution gives a neutral dimeric binuclear copper(I) complex, bis{(μ‐ tricyanomethanido)bis(triphenylphosphane)copper(I)} [Cu(μ‐C(CN)3)(PPh3)2]2 (1). A second product of the synthesis reacts with 1, 10‐phenanthroline to give bis{cis‐(μ‐cyano)bis(triphenylphos‐phane)bis(phenanthroline)dicopper(I)}‐tricyanomethanide‐tetrafluoroborate‐diacetonitrile [cis‐{Cu2(μ‐CN)(Phen)2(PPh3)2}]2[C(CN)3] · BF4 · 2CH3CN (2). The crystal structures of 1 and 2 were determined by X‐ray analysis.
Hydrothermal Synthesis of Two New Transition Metal Coordination Polymers with Mixed Ligands
Authors: Yan Ying , Wu Chuan‐De , Lu Can‐Zhong 
Published: October 2003

AbstractHydrothermal reactions of 1, 2, 4‐benzenetricarboxylic acid, 1, 10‐phenanthroline and transition metal cations including ZnII or CoII, in basified aqueous solution gave rise to two complexes, [Zn3(btrc)2(1, 10‐phen)2(H2O)2]n (1), and [Co3(btrc)2(1, 10‐phen)2(H2O)2]n (2) (btrc = 1, 2, 4‐benzenetricarboxylate, and 1, 10‐phen = 1, 10‐phenanthroline). 1 2 crystalize isotypically in the triclinic space group P1¯. The btrc ligand acts as multi‐dentate bridging ligand in both compound 1 and 2 to link up transition metal atoms into lamella networks, which are further attached into three‐dimensional frameworks through complex hydrogen bonding and π‐π interactions. The photoluminescence spectrum for compound 1 has also been studied. The corresponding reaction with Cu2+ follows another pathway.
The [Tetra(pyridinioacetato)copper]2+ as a Tridentate Chelate to Alkaline‐Eearth Metal Cation: Crystal Structure of [Cu2Ca2(C5H5NCH2CO2)10(H2O)3](ClO4)8·H2O
Authors: Yang Yang‐Yi , Huang Zhong‐Qi , Chen Xiao‐Ming , Weng Ng Seik 
Published: October 2003

AbstractA tetranuclear copper‐calcium complex of pyridinioacetate (C5H5N+CH2CO2—), namely [Cu2Ca2(C5H5NCH2CO2)(H2O)3](ClO4)8·H2O was synthesized and characterized by X‐ray crystallography. The complex crystallizes in triclinic, P1¯ (No. 2), a = 15.658(2), b = 18.260(2), c = 18.456(2)Å, α = 91.552(2), β = 94.004(3), γ = 104.928(2)°, V = 5081(1)Å3, Z = 2. In the crystal structure, a square‐planar [Cu(C5H5NCH2CO2)4]2+ entity uses three of its four carboxylate groups to chelate to a calcium atom forming a [CuCa(C5H5NCH2CO2)4]4+ dinuclear subunit, and a pair of such dinuclear subunits are linked by the two remaining pyridinioacetate ligands through the calcium atoms to furnish a tetranuclear [Cu2Ca2 (C5H5NCH2CO2)10(H2O)3]8+ cation.
Solvothermal Synthesis and Crystal Structures of Two Thioantimonate(V) Compounds with the [SbS4]3— Anion Acting as a Monodentate Ligand: [Mn(C6H18N4)(C6H19N4)]SbS4 and [Mn(C6H14N2)3]2[Mn(C6H14N2)2(SbS4)2]·6H2O
Authors: Schaefer Michael , Engelke Lars , Bensch Wolfgang 
Published: October 2003

AbstractThe two novel thioantimonate(V) compounds [Mn(C6H18N4)(C6H19N4)]SbS4 (I) and [Mn(C6H14N2)3][Mn(C6H14N2)2(SbS4)2]·6H2O (II) were synthesized under solvothermal conditions by reacting elemental Mn, Sb and S in the stoichiometric ratio in 5 ml tris(2‐aminoethyl)amine (tren) at 140 °C or chxn (trans‐1, 2‐diaminocyclohexane, aqueous solution 50 %) at 130 °C. Compound I crystallises in the triclinic space group P1¯, a = 9.578(2), b = 11.541(2), c = 12.297(2)Å, α = 62.55(1), β = 85.75(1), γ = 89.44(1)°, V = 1202.6(4)Å3, Z = 2, and II in the monoclinic space group C2/c, a = 32.611(2), b = 13.680(1), c = 19.997(1)Å, β = 117.237(5)°, V = 7931.7(8)Å3, Z = 4. In I the Mn2+ cation is surrounded by one tetradentate tren molecule, one protonated tren acting as a monodentate ligand and a monodentate [SbS4]3— anion yielding a distorted octahedral environment. In II one unique Mn2+ ion is in an octahedral environment of three bidentate chxn molecules and the second independent Mn2+ ion is coordinated by two chxn ligands and two monodentate [SbS4]3— units leading to a distorted octahedral surrounding. The compounds were investigated and characterized with thermal and spectroscopic methods.
Syntheses and Characterization of Zinc, Cadmium, and Mercury(II) Complexes with N‐(2‐pyridyl)carbonylaniline (L), X‐ray Crystal Structure of [Hg(L)(SCN)2]
Authors: Morsali Ali , Ramazani Ali , Mahjoub Ali Reza , Soudi Ali Akbar 
Published: October 2003

AbstractThe reaction of N‐(2‐pyridyl)carbonylaniline (L) with Zn(NO3)2, CdCl2, and Hg(SCN)2 gives the following complexes: [Zn(L)2](NO3)2, [Cd(L)2Cl2], and [Hg(L)(SCN)2]. The new complexes were characterized by elemental analyses and IR‐, 1H‐, 13C‐NMR spectroscopy. The crystal structure of the [Hg(L)(SCN)2] was determined by single crystal X‐ray analysis. The monomeric complex is built up of a Hg(SCN)2 unit with one N‐(2‐pyridyl)carbonylaniline (L) ligand coordinated to the Hg atom via the ring pyridinic nitrogen atom and the carbonyl oxygen atom forming a five‐membered chelate ring. The Hg atom has a distorted tetrahedral environment. There is π‐π stacking interaction between the parallel aromatic rings belonging to adjacent chain as planar species in which the mean molecular planes are close to parallel and separated by a distance of ∼ 3.5Å, close to that of the planes in graphite. The coordinated N‐(2‐pyridyl)carbonylaniline (L) molecule is involved in hydrogen bonding acting as hydrogen‐bond donors with S and N atoms from SCN— ligand as potential hydrogen‐bond acceptors. There is a shortest intermolecular contacts between the S and N atoms. The hydrogen bonding and shortest intermolecular contacts between the S and N atoms yields infinite chains parallel to the crystallographic vector c. Each molecule is bonded to two neighbors.
The First Calcium(II) Complex with the Saccharinate Ligand: Synthesis, Crystal Structure, Spectral and Thermal Characterization of Trans—diaquabis[(2—hydroxyethyl)pyridinium]bis(saccharinato)calcium(II) Disaccharinate, [Ca(sac)2(H2O)2(Hpyet)2](sac)2
Authors: Yilmaz Veysel T. , Kazak Canan , Hamamci Sevim 
Published: October 2003

AbstractA new calcium(II) complex of the saccharinate ligand (sac) with 2—hydroxyethylpyridinium (Hpyet) was synthesized and characterized by elemental analysis, FT—IR spectroscopy, thermal analysis and single crystal X—ray diffractometry. The [Ca(sac)2(H2O)2(Hpyet)2](sac)2 complex crystallizes in the triclinic space group (P1¯) with the cell dimensions a = 7.4360(7)Å, b = 12.5263(12)Å, c = 12.8329(13)Å, α = 82.534(8)°, β = 75.202(8)° and γ = 89.662(8)° (293 K). The title complex consists of a complex cation and two sac anions. In the complex cation, the calcium(II) ion is six—coordinate, bonding to two aqua ligands, two Hpyet ligands andtwo sac ligands located in the trans positions. Two of the sac ions are coordinated to the calcium(II) ion through the carbonyl O atom, while the other two remain outside the coordination sphere as the counter—ions. Thermal decomposition of the complex in air results in elimination of aqua, Hpyet, and sac ions, respectively.