bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesen und Kristallstrukturen von neuen Alkalimetall‐Selten‐Erd‐Telluriden der Zusammensetzungen KLnTe2 (Ln = La, Pr, Nd, Gd), RbLnTe2 (Ln = Ce, Nd) und CsLnTe2 (Ln = Nd)
Authors: Stöwe Klaus , Napoli Christian , Appel Stephan 
Published: October 2003

AbstractVon den Verbindungen der Zusammensetzung ALnQ2 (A = Na, K, Rb, Cs; Ln = Selten‐Erd‐Metall; Q = S, Se, Te) konnten die Kristallstrukturen der neuen Telluride KLaTe2, KPrTe2, KNdTe2, KGdTe2, RbCeTe2, RbNdTe2 und CsNdTe2 durch Einkristallröntgenstrukturanalysen bestimmt werden. Sie kristallisieren allesamt im α‐NaFeO2‐Typ mit der Raumgruppe R3¯m und drei Formeleinheiten in der Elementarzelle. Die Gitterparameter lauten: KLaTe2: a = 466, 63(3) pm, c = 2441, 1(3) pm; KPrTe2: a = 459, 73(2) pm, c = 2439, 8(1) pm; KNdTe2: a = 457, 83(3) pm, c = 2443, 9(2) pm; KGdTe2: a = 449, 71(2) pm, c = 2443, 3(1) pm; RbCeTe2: a = 465, 18(2) pm, c = 2533, 6(2) pm; RbNdTe2: a = 459, 80(3) pm, c = 2536, 5(2) pm und CsNdTe2: a = 461, 42(3) pm, c = 2553, 9(3) pm. Kennzeichnend für den Aufbau des α‐NaFeO2‐Strukturtyps als geordnete Substitutionsvariante des NaCl‐Typs sind Schichten aus kantenverknüpften [(A+/Ln3+)(Te2—)6]‐Oktaedern, in denen die Besetzung durch die Kationen A+ und Ln3+ schichtweise alterniert.
A Novel 4, 4'‐Azopyridine‐Bridged Manganese Polymer: Quasi Two‐dimensional Structure and Magnetic Properties
Authors: Tang Jin‐Kui , Zhu Li‐Na , Li Xiao‐Zeng , Dong Wen , Liao Dai‐Zheng , Jiang Zong‐Hui , Yan Shi‐Ping , Cheng Peng 
Published: October 2003

AbstractA novel coordination polymer {[Mn(azpy)(NCS)2(MeOH)2] · azpy}n(1) (azpy = 4, 4'‐azopyridine), has been synthesized and characterized by X‐ray diffraction. It consists of a quasi two‐dimensional network structure constructed from 1‐D chains of [Mn(azpy)(NCS)2(MeOH)2]n connected by hydrogen bonds, which creates about 13.6 Å × 17.1 Å of channels. The coordination sphere of the manganese(II) ion is a distorted octahedron. The determination of the variable temperature magnetic susceptibilities (5—300 K) shows the existence of a very weak antiferromagnetic interaction with a J value of —0.03 cm—1.
Natriumtrithiophosphat(V): Kristallstruktur und Natriumionenleitfähigkeit
Authors: Pompetzki M. , Jansen M. 
Published: October 2003

AbstractNa3POS3 wurde wasserfrei durch Gefriertrocknung des entsprechenden Hydrates hergestellt. Die Kristallstruktur von Na3POS3 wurde aus Röntgen‐ und Neutronenpulverdaten bestimmt und durch simultane Rietveld‐Verfeinerung der Neutronen‐ und Röntgendaten (Cmc21, a = 9, 5105(1), b = 11, 5463(1), c = 5, 9323(1)Å, Rp = 5, 37 %, Rwp = 4, 47 %) verfeinert. Die Schwerpunkte der POS3‐Tetraeder sind im Sinne einer hexagonal dichten Packung angeordnet. Die P—O‐Bindungen sind dabei „polar”︁ parallel zur c‐Achse ausgerichtet. In der Projektion entlang [001] übereinander liegende Tetraeder stehen ekliptisch. Die Struktur von Na3POS3 steht in enger Beziehung (maximale Untergruppe) zu derjenigen von Ca3CrN3. Ab 250 °C kann Na3POS3 aufgrund seiner durchweg hohen Leitfähigkeit den schnellen Ionenleitern zugeordnet werden.
Reaktionen von Cyclostibanen (RSb)n [R = (Me3Si)2CH, n = 3; Me3CCH2, n = 4, 5] mit den Übergangsmetallcarbonyl‐Komplexen [W(CO)5(thf)], [CpxMn(CO)2(thf)], [CpxCr(CO)3]2 und [Co2(CO)8]; Cpx = MeC5H4
Authors: Balázs G. , Breunig H. J. , Lork E. 
Published: October 2003

Abstract(RSb)3 [R = (Me3Si)2CH] reagiert mit [W(CO)5(thf)], [CpxMn(CO)2(thf)] oder [Co2(CO)8] zu [(RSb)3W(CO)5] (1), [RSb{Mn(CO)2Cpx}2] (2) oder [RSbCo(CO)3]2 (3). Die Reaktion von (R′Sb)n (n = 4, 5; R′ = Me3CCH2) mit [CpxCr(CO)3]2 führt zu [(R′Sb)4{Cr(CO)2Cpx}2] (4); Cpx = MeC5H4, thf = Tetrahydrofuran.
Thermogravimetric, Cyclovoltammetric, and Mössbauer Spectroscopic Investigations on Heterobimetallic Organo Derivatives of Silicon and Germanium with the 2‐(Dimethylaminomethyl)ferrocenyl Ligand (η5‐C5H5)Fe[η5‐C5H3(CH2NMe2)], FcN
Authors: Jacob Klaus , Zanello Piero , Fontani Marco , Pietzsch Claus , Bohmhammel Klaus , Lorenz Volker 
Published: October 2003

AbstractThe thermic decomposition of the cyclotetrametaloxanetetrols [(FcN)4M4O4(OH)4] (M= Si(1), Ge(2)) as well as the cyclohexagermoxanediol [(FcN)6Ge6O8(OH)2] (3) takes place in three defined steps. At the monomer silandiol [(FcN)2Si(OH)2] (4) only two such steps are observed. The cyclovoltammetric oxidation of the metaloxanes 1‐2 occurs in two two‐electron steps and following two one‐electron transitions. The oxidation of 3 occurs in a four‐electron process and a following two‐electron transition. Silandiol 4 is oxidized via two one‐electron transitions. The oxidation of the educt [FcNGeCl3] (5) occurs in a one‐electron step. Temperature depending 57Fe‐Mössbauer‐measurements confirm as well intervalent electron transitions in 1‐5 as the chelate stucture in 5.
Polysulfonylamine. CLXV [1] Kristallstrukturen von Metall‐di(methansulfonyl)amiden. 14 [1] Cs3Ag[(MeSO2)2N]4 und CsAg[(MeSO2)2N]2: Ein dreidimensionales und ein schichtförmiges Koordinationspolymer mit Bis(dimesylamido‐N)argentat‐Baugruppen
Authors: Latorre Violeta , Jones Peter G. , Moers Oliver , Blaschette Armand 
Published: October 2003

AbstractEs werden zufällige Bildungswege und Tieftemperatur‐Röntgenstrukturen für die Koordinationsverbindungen Cs3A2[AgA2] (1) und Cs[AgA2] (2) mitgeteilt, wobei A— den fünfzähnigen Dimesylamid‐Liganden (MeSO2)2N— bezeichnet. Beide Phasen (monoklin, Raumgruppe C2/c, Z′ = 1/2) enthalten inversionssymmetrische Bis(dimesylamido‐N)argentat‐Einheiten mit exakt linearen N—Ag—N‐Gerüsten und kurzen, überwiegend kovalenten Ag—N‐Bindungen [1: 213, 5(2), 2: 213, 35(12) pm]; in beiden Fällen ist die Koordinationszahl des Silberions durch vier innere und zwei äußere Ag···O‐Sekundärbindungen auf 2 + 6 erhöht. Das dreidimensionale Koordinationspolymer 1 besteht aus alternierenden Schicht‐Substrukturen der Konstitution [{Cs(1)}{A}4/2]— mit Cs(1) auf zweizähligen Drehachsen bzw. [{Cs(2)}2{AgA2}4/4]+ mit Cs(2) auf allgemeinen Lagen. Innerhalb der Substrukturen erreichen die zwei Arten von Caesiumionen annähernd planare (O4)‐Umgebungen, während die endgültigen Koordinationssphären durch Zwischenschicht‐Bindungen zu O6 für Cs(1) und O8N für Cs(2) erweitert werden. Im Gegensatz dazu handelt es sich bei 2 um eine echte Schichtstruktur. Die Schichten enthalten, in alternierender Anordnung, Ketten von Cs+‐Ionen entlang zweizähliger Drehachsen und [AgA2]—‐Stapel mit innerer Stabilisierung durch Ag···O‐Sekundärbindungen sowie schwache Wasserstoffbrücken der Art C—H···O; für Cs+ resultiert eine (O8)‐Umgebung. Beide Strukturen weisen ein dreidimensionales (C—H···O)‐Netzwerk auf.
Eine neue Modifikation der Laves‐Phase CaLi2
Authors: Fischer Dieter , Jansen Martin 
Published: October 2003

AbstractDurch simultane Bedampfung eines Saphirsubstrates mit Calcium und Lithium wurde eine neue Modifikation von CaLi2 (β‐CaLi2) erhalten. Diese kristallisiert kubisch im MgCu2‐Typ (Fd3¯m, a = 885.6(1) pm, Rp=5.1 %, Rwp=6.6 %, Strukturanalyse mittels Rietveld‐Methode) und wandelt sich bei 150 °C in das bekannte hexagonale α‐CaLi2 um. Das thermische Verhalten wurde durch temperaturaufgelöste Röntgenpulveruntersuchungen studiert.
Vergleichende Untersuchungen zur Struktur von 4‐Dimethylaminopyridin‐Addukten
Authors: Thomas Florian , Bauer Tillmann , Schulz Stephan , Nieger Martin 
Published: October 2003

AbstractLewis‐Säure/Base‐Addukte des Typs dmap—MMe3 (M = Al 1, Ga 2, In 3, Tl 4) sowie dmap—AlCl3 (6) und dmap—Al(t‐Bu)3 (7) wurden durch Reaktion von MR3 mit 4‐Dimethylaminopyridin (dmap) synthetisiert, während dmap—AlH3 (5) ausgehend von AlH3·Et2O erhalten werden konnte. 1—7 wurden durch NMR‐ (1H, 13C{1H}) und Massenspektrometrie sowie mittels Elementaranalyse eindeutig charakterisiert. Zusätzlich wurde von allen Verbindungen eine Einkristallröntgenstrukturanalyse durchgeführt. Ein Strukturvergleich zeigt die Einflüsse elektronischer (Lewis‐Acidität des Gruppe 13‐Zentralatoms) und sterischer Wechselwirkungen auf Struktur und Stabilität derartiger Lewis‐Säure/Base‐Addukte.
LaCl(BO2)2 und Er2Cl2[B2O5]: Zwei Chlorid‐Oxoborate dreiwertiger Lanthanide
Authors: Nikelski Tanja , Schleid Thomas 
Published: October 2003

AbstractEr2Cl2[B2O5] entsteht einkristallin bei der Umsetzung von ErCl3 mit den Sesquioxiden Er2O3 und B2O3 mit einem Überschuß von ErCl3 als Flußmittel in evakuierten Quarzglasampullen nach zwei Wochen bei 850 °C. Die Verbindung fällt in langen, rosafarbenen Nadeln an und ist luft‐ und hydrolysestabil. Einkristalle von LaCl(BO2)2 bilden sich bei der Umsetzung von La2O3, LaCl3 und B2O3 in einem Überschuß von B2O3 als Flußmittel in evakuierten Quarzglasampullen nach vier Wochen bei 900 °C. LaCl(BO2)2 kristallisiert in dünnen, farblosen, luft‐ und wasserbeständigen Nadeln, die aufgrund ihres faserigen Habitus stark zu Wachstumsverzwillingung neigen. Die Kristallstruktur von Er2Cl2[B2O5] (orthorhombisch, Pbam; a = 1489, 65(9); b = 1004, 80(6); c = 524, 86(3) pm; Z = 4) enthält zwei kristallographisch unterschiedliche Erbium‐Kationen. (Er1)3+ wird von sieben Anionen pentagonal‐bipyramidal umgeben, während (Er2)3+ von nur sechs Anionen oktaedrisch koordiniert vorliegt. Die planaren Oxodiborat‐Einheiten [B2O5]4—, die aus zwei eckenverknüpften [BO3]3—‐Dreiecken bestehen, liegen gemäß {([BOO]2)4—} isoliert vor. LaCl(BO2)2 kristallisiert isotyp mit PrCl(BO2)2 triklin in der Raumgruppe P1¯ (a = 423, 52(4); b = 662, 16(7); c = 819, 33(8) pm; α = 82, 081(8); β = 89, 238(9); γ = 72, 109(7)°; Z = 2). Die charakteristische Baueinheit besteht aus unendlichen Ketten eckenverknüpfter [BO3]3—‐Dreiecke. Diese quasi‐planaren, zickzack‐förmigen Ketten der Zusammensetzung {[(B1)OO(B2)OO]2—} (≡ {[BO2]—} verlaufen entlang [100]. Die La3+‐Kationen weisen eine Koordinationszahl von zehn auf und werden von drei Cl—‐ und sieben O2—‐Anionen koordiniert.
Multi‐dimensional Copper(II) Coordination Polymers via Self‐assembly Induced by Sodium Ions
Authors: Chen Xiao‐Yan , Shi Wei , Cheng Peng , Chen Jiu‐Tong , Yan Shi‐Pin , Liao Dai‐Zheng , Jiang Zong‐Hui 
Published: October 2003

AbstractTwo novel copper(II) coordination polymers, [CuNa2(Hnta)2]n (1) and {[CuNa2(pht)2(H2O)]·H2O}n (2) (H3nta = nitrilotriacetate acid, H2pht = o‐phthalic acid), have been synthesized and characterized.The sodium ions play an important role in the formation of the multi‐dimensional structures. The X‐ray structure of [CuNa2(Hnta)2]n (1) is three‐dimensionally cross‐linked with building blocks [Cu(Hnta)2]2—connected by three sodium ions. The structure of {[CuNa2(pht)2(H2O)]·H2O}n (2) can be described as pht units connected by Na ions via Na—O bonds to form chains, which are linked by CuII ions to make a 2D network. The IR spectra and thermal properties are also reported.
Synthesis of Ethylene‐bridged Heterocyclic Bidentate P(III)N‐Ligands — Oxidation and Complexation Studies
Authors: Lu Yingzi , Freytag Matthias , Jones Peter G. , Schmutzler Reinhard 
Published: October 2003

AbstractA series of phosphor(III)inanone ligands 4‐7, linked by ethylene bridges between the nitrogen atoms of the heterocyclic rings, were synthesized by the reaction of the bis‐PCl derivative 3 with the appropriate trimethylsilylamines. The bis‐phosphor(V)inanone compounds 8‐11 were obtained by the oxidation of 4‐7 with hexafluoroacetone (HFA). Oxidation of 4 and 6 with tetrachloro‐orthobenzoquinone (TOB) gave the bis‐phosphor(V)inanones 12 and 13. The reaction of 4‐6 with [Pt(COD)Cl2] led to the platinum complexes 14‐16. All the σ3‐phosphorinanone compounds 4‐7 and the σ5‐phosphorinanone compounds 8‐10, 12 and 13 exist as a mixture of two conformers, as indicated by two signals in the 31P‐NMR spectra. However, compounds 9 and 11 exist as single conformers, both display only one sharp singlet in the 31P‐NMR spectra. The Pt‐complexes 15 and 16 contain two conformers; one conformer of 16 could be isolated by crystallization. X‐ray crystal structure determinations for compounds 8, 14 and 16 were conducted, revealing inversion symmetry for 8 and cis arrangement for 14 and 16.
Synthesis and Structural Characterization of Two New 2D Isophthalate‐bridged Copper(II) Polymers Based on Tricopper Units
Authors: Zhang Qiang , Ye Bao‐Hui , Ren Chun‐Xia , Chen Xiao‐Ming 
Published: October 2003

AbstractTwo new neutral polymeric layer compounds, [Cu3(bpy)2(Hip)2(ip)2] (1) and [Cu3(phen)2(Hip)2(ip)2] (2) (bpy = 2, 2′‐bipyridine, phen = 1, 10‐phenanthroline, ip = isophthalate), have been synthesized under hydrothermal conditions and characterized by X‐ray crystallography. Complex1crystallizes triclinic,P1¯ (No. 2),a= 10.352(5),b= 10.859(6),c= 11.602(6)Å, α = 83.25(1),β= 84.71(1),γ= 66.19(1)°,V= 1183.5(11)Å3,Z= 1;2triclinic,P1¯ (No. 2),a= 10.375(1),b= 10.668(1),c= 11.758(1)Å, α = 83.179(2),β= 86.228(2),γ= 71.187(2)°,V= 1222.7(2)Å3,Z= 1. The complexes consist of trinuclcear copper units that are bridged via two ip ligands forming zigzag polymeric chains. These chains are further extended into layers via aromatic π‐π interactions as well as hydrogen bonds between the free carboxyl groups and carboxylates.
Synthesis and Crystal Structure of Tellurium(II) bis(2‐methoxycarbonylethanethiolate): A Novel Coordination Mode of Tellurium
Authors: Fleischer Holger , Hennig Sandra , Schollmeyer Dieter 
Published: October 2003

AbstractThe tellurium(II) dithiolates Te[SCH2CH2C(O)OCH3]2, (1), Te[SCH2CH2CH2SC(O)CH3]2, (2), and Te[SCH2CH2CH2CH2SC(O)CH3]2, (3) were synthesized from Te(StBu)2 and the corresponding thiol. All compounds are sensitive toward higher temperatures and light and decompose to elemental tellurium and the disulfide. In the solid state, the Te atom of 1 exhibits the novel Te(S2Te2) coordination mode. Additionally to the two Te—S bonds, each Te atom forms two long Te···Te contacts to neighboring molecules, leading to a coordination number of four and a distorted sawhorse configuration. No intramolecular Te···O interactions are present in the solid state, in accordance with ab initio calculations (MP2/ecp‐basis) for the isolated molecule. 125Te NMR shifts of all compounds lay within a narrow range and close to the respective shift of other Te(SCH2R)2 compounds. VT 125Te NMR spectra gave no hint to donor acceptor interactions in solution for any of the compounds and thus corroborate results from IR‐spectroscopy, ab initio geometry optimizations, and thermochemical calculations.
Non‐Isomorphic Chlorine—Bromine Substitution in the Copper(I) Halide π‐Complexes with 1‐Allyl‐4‐aminopyridinium
Authors: Goreshnik E. A. , Schollmeyer D. , Mys'kiv M. G. 
Published: October 2003

AbstractBy alternating‐current electrochemical synthesis crystals of {Cu[H2NC5H4N(C3H5)]Br2}˙H2O (I), {Cu[H2NC5H4N(C3H5)]Br0.65Cl1.35}˙H2O (II) and {Cu[H2NC5H4N(C3H5)]Cl2} (III) π‐complexes have been obtained and structurally investigated. The I and II compounds are isostructural and crystallize in a monoclinic sp. gr. P21/c, I: a = 7.359(2)Å, b = 12.3880(6)Å, c = 13.637(3)Å, β = 107.03(1)°, V = 1188.7(4)Å3, Z = 4 for C8H13N2OBr2Cu composition, R = 0.0293 for 2140 reflections. II: a = 7.2771(6)Å, b = 12.3338(3)Å, c = 13.4366(7)Å, β = 107.632(2)°, V = 1149.3(1)Å3, Z = 4 for C8H13N2Br0.65Cl1.35Cu composition, R = 0.0463 for 2185 reflections. Metal and halogen atoms form centrosymmetric Cu2X4 dimers. Each copper atom is surrounded by three halogen atoms and by a weakly bonded C=C‐group of the onium moiety. Isolated {Cu[H2NC5H4N(C3H5)]}2X4 dimers are combined into a three‐dimensional network due to a bridging function of water molecules via a system of rather strong hydrogen bonds. Chlorine derivative III crystallizes in another structure type: sp. gr. C2/c, a = 21.568(7)Å, b = 7.260(2)Å, c = 13.331(3)Å, β = 95.65(2)°, V = 2077(2)Å3, Z = 8 for C8H11N2Cl2Cu composition. Copper atom, included in CuCl2— isolated fragment, is coordinated to a C=C‐bond of ligand moiety. N‐H…Cl hydrogen bonds unite Cu[H2NC5H4N(C3H5)]Cl2 subunits into infinite ribbons. π‐Interaction in III appears to be more effective than in I and II.
The Crystal Structure of Ba3Cu2Al2F16: a Relative of Ba4Cu2Al3F21
Authors: Gredin Patrick , Corbel Gwenaël , Wright Jonathan P. , Dupont Nathalie , de Kozak Ariel 
Published: October 2003

AbstractBa3Cu2Al2F16 is monoclinic: a = 7.334(1)Å, b = 5.320(2)Å, c = 16.022(1)Å, β = 96.34(1)°, Z = 2. Its crystal structure was solved in the space group P21 (No. 4) from synchrotron X‐ray single crystal data using 2685 unique reflections (2639 with Fo/σ(Fo) > 4). The final R factor is 0.044. The structure consists of a succession along the c‐axis of the cell of three layers of two different kinds of sheets developing in the (a, b) plane. The first one, formulated [(AlF5)2]∞4— and hereafter named A, is built up from infinite cis‐chains of aluminium‐fluorine octahedra [AlF6], linked by two vertices and distanced by a. The second one, formulated [Cu2AlF11]∞4— and named B, is bidimensional. It is constituted of distorted copper‐fluorine octahedra [CuF6], linked by edges, which form infinite chains interconnected by three vertices of isolated [AlF6] octahedra. The stacking sequence of the sheets is (A, B, B)∞. The barium ions, 12‐coordinated, are inserted between the sheets. The crystal structure of Ba3Cu2Al2F16 is closely related to that of Ba4Cu2Al3F21. Only the proportion and the stacking sequence of the two kinds of sheets in the c‐direction differ, according to two different compositions and two different symmetries.
Structural and Spectroscopic Characterization of Two New Thallium(I)/Thiosaccharinate Complexes
Authors: Tarulli Susana H. , Quinzani Oscar V. , Piro Oscar E. , Castellano Eduardo E. , Baran Enrique J. 
Published: October 2003

AbstractThe crystal structures of [Tl(tsac)] (1) and [Tl(tsac)(ophen)] (2) (tsac = anion of thiosaccharin; ophen = 1, 10 phenanthroline) have been determined at 116 K by single crystal X‐ray diffractometry. Complex 1 crystallizes in the monoclinic space group P21/a with Z = 4 and complex 2 in the monoclinic space group C2/c with Z = 8.In both complexes TI is coordinated to a thiosaccharinate anion through its sulphur and nitrogen atoms. A distorted eight fold coordination sphere around the cation in complex 1 is completed with two other longer Tl‐S bonds and four Tl···O contacts with five symmetry related neighbouring thiosaccharinate anions. A phenanthroline molecule acting as a bidentate ligand through its nitrogen atoms completes a four‐fold coordination around the metal atom in complex 2. The infrared spectra of both complexes were also recorded and their most important features discussed on the basis of its structural peculiarities.
Single Crystals of NaPrTe2 with LiTiO2‐Type Structure
Authors: Lissner Falk , Schleid Thomas 
Published: October 2003

AbstractDuring attempts to synthesize rare‐earth nitride tellurides black and bead‐shaped single crystals of the title compound sodium praseodymium(III) ditelluride (NaPrTe2) were obtained as a by‐product by reacting a mixture of praseodymium, sodium azide (NaN3) and tellurium at 900 °C for seven days in evacuated torch‐sealed silica vessels. NaPrTe2 crystallizes cubic (space group: Fd3¯m, Z = 16; a = 1285.51(9) pm, Vm = 79.96(1) cm3/mol, R1 = 0.028 for 146 unique reflections) and exhibits the Na+ and Pr3+ cations in slightly distorted octahedra of six telluride anions (d(Na—Te) = 325 pm, d(Pr—Te) = 317 pm) each. The main characteristics of this new structure type for alkali‐metal rare‐earth(III) dichalcogenides can be derived from the rock‐salt type structure (NaCl, cubic closest‐packed Te2— arrangement, all octahedral voids occupied with Na+ and Pr3+) with alternating layers consisting of Na+ and Pr3+ cations in a ratio of 3:1 and 1:3, respectively, piled along the [111] direction.
Bulky Amido Ligands in Rare Earth Chemistry — Syntheses, Structures, and Catalysis
Authors: Roesky Peter W. 
Published: October 2003

AbstractThe amido metal chemistry of the rare earth elements is a rapid developing area in coordination chemistry. Especially bulky mono and bidentate amido and amidinates have been introduced as ligands in rare earth chemistry. Due to these sterically demanding ligands, the coordination numbers of the rare earth elements are significantly reduced. This article focuses on two of these bulky ligand systems: bis(trimethylsilyl)amide and aminotroponiminates.The homoleptic bis(trimethylsilyl)amides of rare earth elements, [Ln{N(SiMe3)2}3], are well established compounds in synthetic chemistry. Therefore, this article reviews recent progress in the catalytic application of these compounds. In the second part of this research report, it is shown that N, N′‐disubstituted aminotroponiminates and mono bridged bisaminotroponiminates can be used as cyclopentadienyl alternatives. Achiral and chiral aminotroponiminates have been used. The structural properties, reactivities as well as the catalytic and synthetic applications of the aminotroponiminates complexes will be outlined in this article.
Strukturen der Alkalimetallsalze aromatischer, heterocyclischer Amide: Synthese und Struktur von Kronenether‐Addukten der Alkalimetall‐indolide
Authors: Heldt Ingo , Borrmann Tobias , Behrens Ulrich 
Published: October 2003

AbstractDie Synthese von fünf Alkalimetall‐indolid‐Kronenether‐Komplexen wird beschrieben. Lithium‐indolid(12‐Krone‐4) (1) wurde aus Butyllithium, Indol und 12‐Krone‐4 synthetisiert; Natrium‐indolid(15‐Krone‐5) (2) aus Natriummetall, Indol und 15‐Krone‐5; Kalium‐indolid(18‐Krone‐6) (3) aus Kaliumhydrid, Indol und 18‐Krone‐6. Rubidium‐ und Caesium‐indolid(18‐Krone‐6) (4, 5) wurden aus Rb‐ bzw. Cs‐hexamethyldisilazid, Indol und 18‐Krone‐6 erhalten. Die Strukturen von 2, 4 und 5 konnten röntgenographisch bestimmt werden. Die Komplexe 2 und 4 sind einkernig, das Indolid‐Anion weist eine η1(N)‐Koordination zum Metallkation auf. Komplex 5 ist zweikernig mit einem zentralen [Cs—N—]2‐Ring.
A 2D Acentric Coordination Polymer, [Mn(HIDA)2(H2O)2], with a Strong Second‐Order Nonlinear Optical Effect
Authors: Yong Guo‐Ping , Jiang Chao , Wang Zhi‐Yong 
Published: October 2003

AbstractThe crystal structure of [Mn(HIDA)2(H2O)2] (Tetragonal, P4¯21c (no.114), a = b = 8.10(2)Å, c = 9.605(3)Å, α = β = γ = 90°, Z = 2, R = 0.051, wR2 = 0.123 for 460 observed reflections) consists of infinite acentric 2D square grids with HIDA— ions as bridging ligands. The 2D grids are interlocked(along the c axis) by hydrogen bonding. The Mn atoms are octahedrally coordinated by four O atoms of four HIDA— ions (d(Mn—O)= 2.183(4)Å ) and two O atoms of two water molecules (d(Mn—OW) = 2.154(5)Å ). The results show that this acentric coordination polymer exhibits strong powder second harmonic generation (SHG) efficiency, ca. 1.9 times that of potassium dihydrogen phosphate, and remarkable thermal stability.