bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pre‐induction sonographic measurement of cervical length in prolonged pregnancy: the effect of parity in the prediction of the need for Cesarean section
Authors: Rane S. M. , Guirgis R. R. , Higgins B. , Nicolaides K. H. 
Published: July 2003

AbstractObjectiveTo examine the effect of parity on the relationship between pre‐induction cervical length and the risk of Cesarean section in women undergoing induction of labor for prolonged pregnancy.MethodsIn 382 singleton pregnancies, induction of labor was carried out at 41 + 3 to 42 + 1 weeks of gestation. The cervical length was measured by transvaginal sonography before induction. In 71 of these cases a Cesarean section was required for either fetal distress or failure to progress and 311 women delivered vaginally. The effect of parity and pre‐induction cervical length on the risk of Cesarean section was examined.ResultsIn nulliparous women the incidence of Cesarean section was significantly higher than in multiparous women (28.1% vs. 8.9%). In both nulliparae and multiparae there was a significant association between pre‐induction cervical length and the rate of Cesarean section. Logistic regression analysis demonstrated that cervical length and parity provided significant independent prediction of all Cesarean sections and Cesarean sections for failure to progress. The odds of Cesarean section increased by about 10% with each increase of 1 mm in cervical length, over the mean cervical length of 20 mm for nulliparae and 18 mm for multiparae, and the odds was about 75% lower in multiparae, compared to nulliparae with the same cervical length. Receiver–operating characteristics curves (ROC) demonstrated that cervical length was better than the Bishop score in the prediction of all Cesarean sections (area under ROC = 0.72 vs. 0.68) and Cesarean sections for failure to progress (area under ROC = 0.76 vs. 0.69).ConclusionIn women undergoing induction of labor for prolonged pregnancy, cervical length and parity provide significant independent prediction of the likelihood of Cesarean section. Copyright © 2003 ISUOG. Published by John Wiley & Sons, Ltd.
Measurement of nasal bone length at 11–14 weeks of pregnancy and its potential role in Down syndrome risk assessment
Authors: Orlandi F. , Bilardo C. M. , Campogrande M. , Krantz D. , Hallahan T. , Rossi C. , Viora E. 
Published: July 2003

AbstractObjectivesTo assess the feasibility of measuring nasal bone length in first‐trimester pregnancy and to confirm if the absence of a fetal nasal bone is a marker for Down syndrome.MethodsFetal nasal bone assessment was attempted in 1089 consecutive singleton pregnancies between 11 and 14 weeks' gestation. All ultrasound examinations were performed transabdominally in three separate centers. If the nasal bone was present, nasal bone length was measured.ResultsNasal bone assessment was successfully achieved in 1027 of 1089 (94.3%) ultrasound examinations. Within this group nasal bone was absent in 10 of 1000 (1.0%) unaffected cases, 10 of 15 (66.7%) Down syndrome cases and 5 of 12 (41.7%) cases with other pathological conditions. Regression analysis showed a significant increase (P < 0.0001) in nasal bone length from 2.48 mm at a crown–rump length of 45 mm to 3.12 mm at a crown–rump length of 84 mm. The nasal bone length in the five cases of Down syndrome in which the nasal bone was present was less than the median measurement of unaffected cases. Using modeling, the combination of nasal bone with maternal age, nuchal translucency, free beta‐human chorionic gonadotropin (hCG) and pregnancy associated plasma protein‐A (PAPP‐A) achieved a detection rate of 95% with a false‐positive rate of 2.9%. At a fixed 1% false‐positive rate, the detection rate was 91%.ConclusionsAbsence of the nasal bone can be used as a marker for Down syndrome in the first trimester of pregnancy. Inclusion of the nasal bone in the current first‐trimester screening protocol along with nuchal translucency, free beta‐hCG and PAPP‐A can achieve high detection at a very low false‐positive rate. Large datasets are needed to confirm whether the measurement of nasal bone length provides additional benefits beyond the assessment of the presence or absence of the nasal bone. Copyright © 2003 ISUOG. Published by John Wiley & Sons, Ltd.
Comparison of fetal nasal bone assessment by ultrasound at 11–14 weeks and by postmortem X‐ray in trisomy 21: a prospective observational study
Authors: Larose C. , Massoc P. , Hillion Y. , Bernard J. P. , Ville Y. 
Published: July 2003

AbstractObjectiveTo compare nasal bone assessment by ultrasound examination at 11–14 weeks' gestation and postmortem X‐ray examination in fetuses with trisomy 21.MethodsTwenty‐one fetuses with trisomy 21 which had undergone sonographic examination at 11–14 weeks for measurement of nuchal translucency thickness and assessment of the nasal bones were examined by postmortem X‐ray following termination of pregnancy.ResultsThe nasal bones were absent in 11/21 (52.4%) fetuses on ultrasound examination at 11–14 weeks and in 10/21 (47.6%) fetuses on X‐ray examination at 14 to 25 + 5 weeks. Ultrasound and X‐ray findings were discordant in 9/21 (42.9%) cases. Eight of 11 (72.7%) fetuses with absent nasal bones on ultrasound examination had a nuchal translucency thickness > 95th centile.ConclusionThe high incidence of absent nasal bones in first‐trimester fetuses with trisomy 21 is compatible with a developmental delay. Prior to inclusion of nasal bone assessment into risk calculation for trisomy 21, the independence of absence of nasal bones by ultrasound and increased nuchal translucency above the 95th centile at 11–14 weeks should be investigated more extensively. Copyright © 2003 ISUOG. Published by John Wiley & Sons, Ltd.
Absent nasal bone at 11–14 weeks of gestation and chromosomal defects
Authors: Cicero S. , Longo D. , Rembouskos G. , Sacchini C. , Nicolaides K. H. 
Published: July 2003

AbstractObjectiveTo examine the association between absence of the nasal bone at the 11–14‐week ultrasound scan and chromosomal defects.MethodsUltrasound examination was carried out in 3829 fetuses at 11–14 weeks' gestation immediately before fetal karyotyping. At the scan the fetal crown–rump length (CRL) and nuchal translucency (NT) thickness were measured and the fetal profile was examined for the presence or absence of the nasal bone. Maternal characteristics including ethnic origin were also recorded.ResultsThe fetal profile was successfully examined in 3788 (98.9%) cases. In 3358/3788 cases the fetal karyotype was normal and in 430 it was abnormal. In the chromosomally normal group the incidence of absent nasal bone was related firstly to the ethnic origin of the mother (2.8% for Caucasians, 10.4% for Afro‐Caribbeans and 6.8% for Asians), secondly to fetal CRL (4.6% for CRL of 45–54 mm, 3.9% for CRL of 55–64 mm, 1.5% for CRL of 65–74 mm and 1.0% for CRL of 75–84 mm) and thirdly, to NT thickness, (1.8% for NT < 2.5 mm, 3.4% for NT 2.5–3.4 mm, 5.0% for NT 3.5–4.4 mm and 11.8% for NT ≥ 4.5 mm. In the chromosomally abnormal group the nasal bone was absent in 161/242 (66.9%) with trisomy 21, in 48/84 (57.1%) with trisomy 18, in 7/22 (31.8%) with trisomy 13, in 3/34 (8.8%) with Turner syndrome and in 4/48 (8.3%) with other defects.ConclusionAt the 11–14‐week scan the incidence of absent nasal bone is related to the presence or absence of chromosomal defects, CRL, NT thickness and ethnic origin. Copyright © 2003 ISUOG. Published by John Wiley & Sons, Ltd.
A Spectroscopic and Structural Study on Sterically Demanding (Mesityl, Nonafluoromesityl, and Supermesityl) Benzeneselenenyl Chlorides/Bromides and Selenocyanates
Authors: Klapötke Thomas M. , Krumm Burkhard , Mayer Peter , Piotrowski Holger , Vogt Martin 
Published: July 2003

AbstractThe preparation and thorough characterization of benzeneselenenyl chlorides, bromides and selenocyanates containing various mesityl substituted groups, i.e. 2, 4, 6‐(X3)3C6H2 (X = CH3, CF3, and (CH3)3C), was achieved. Detailed multinuclear NMR studies revealed isotope effects at the selenium‐halogen bond. X‐ray crystallographic studies on a series of selenenyl species enabled comparisons on the influence of the attached substituents.
Asymmetric Catalysis. 151 [1] Wilkinson‐type [Rh(diop)(PPh3)Hal] Catalysts in the Enantioselective Hydrogenation of Ketopantolactone
Authors: Brunner Henri , Zettler Christian , Zabel Manfred 
Published: July 2003

AbstractThe Wilkinson‐type catalysts [Rh(diop)(PPh3)Cl] and [Rh(diop)(PPh3)I] have been synthesised and characterised by X‐ray structure analysis. In the crystal the distorted square planar compounds form pairs of diastereomers. The compounds were tested as catalysts in the enantioselective hydrogenation of ketopantolactone. With 65 % ee the iodo complex achieved a higher enantioselectivity than the chloro complex (55 % ee).
Molekulare Vierecke: Cyanidverbrückte Vierkernkomplexe mit Fe‐, Ni‐ und Zn‐Bausteinen
Authors: Flay Marie‐Louise , Comte Virginie , Vahrenkamp Heinrich 
Published: July 2003

AbstractUnter Benutzung von cis‐(bpy)2FeX2‐Bausteinen ließen sich schrittweise molekulare Vierecke mit Fe2M2(μ‐CN)4‐Gerüsten aufbauen. Intermediate waren Zweikernkomplexe mit Fe‐CN‐M‐Einheiten (M = Ni, Cu) und Dreikernkomplexe mit Zn(NC‐Fe)2‐ und Fe(CN‐M)2‐Einheiten (M = Ni, Cu). Spektroskopische und elektrochemische Daten wurden ermittelt. Vom Fe(CN‐Cu)2‐Dreikernkomplex und vom Fe4(μ‐CN)4‐Vierkernkomplex wurden die Strukturen bestimmt.
2, 2′, 3, 3′, 4, 4′‐Hexakis[tri(tert‐butyl)silyl]‐1, 1′‐di(cyclotetrastiban): Synthese, Charakterisierung und Struktur eines neuen polygonen Antimonclusters
Authors: Westerhausen Matthias , Weinrich Sabine , Mayer Peter 
Published: July 2003

AbstractBei der Reaktion von Natrium‐tri(tert‐butyl)silanid mit SbCl3 isoliert man mit mäßiger Ausbeute grün‐braunes ‐2, 2′, 3, 3′, 4, 4′‐Hexakis[tri(tert‐butyl)silyl]‐1, 1′‐di(cyclotetrastiban) (1) mit einem neuartigen Sb8‐Cluster. Verbindung 1 kristallisiert in der triklinen Raumgruppe P1¯. Der große Raumanspruch der Tri(tert‐butyl)silyl‐Gruppen erzwingt sowohl eine Faltung des viergliedrigen Sb4‐Cyclus als auch eine Aufweitung der Sb‐Sb‐Si‐Bindungswinkel auf etwa 105.5°. Die mittlere Sb‐Sb‐Bindungslänge beträgt 285.4 pm und liegt im gleichen Bereich wie bei den Distibanen.
Aufbau von metallorganischen In—As‐Gerüstverbindungen
Authors: Iravani Effat , Dashti‐Mommertz Anahita , Neumüller Bernhard 
Published: July 2003

AbstractDie Reaktionen von RInCl2 und InCl3 mit tBuAsLi2 im molaren Verhältnis 4:2:4 bzw. 6:2:6 ergeben die Komplexe [(RInCl)4(InCl)2(AstBu)4] (R = Mes; 1) bzw. [Li(THF)4]2[(RInCl)6(InCl)2(AstBu)6] (R = CH2Ph; 2). Wird eine Kombination von Me2InCl und MeInCl2 mit dem Dilithiumarsanid im molaren Verhältnis 2:4:6 verwendet, bildet sich ein anionischer In—As‐Käfig, der in Form von [Li(DME)3]2[(InMe2)2(InMe)4(AstBu)6]·2DME (3) anfällt. Werden die Komponenten im Verhältnis 2:6:6 in THF zur Reaktion gebracht, ist nur ein mikrokristallines Pulver zu gewinnen. Erst der Zusatz von wenig nichtgetrocknetem THF ergibt nach Einbau von OH—Funktionen den achtkernigen Komplex [(InMe2)2(InMe)6(AstBu)6(OH)2]·2THF (4). Diese Methode führt auch bei der Umsetzung von MeInCl2 und tBuAsLi2 im Verhältnis 1:1 zum Erfolg. Das erste nur als Pulver anfallende Produkt wird bei Anwesenheit von wenig ungetrocknetem THF in guten Ausbeuten zum neunkernigen Käfigmolekül [(InMe)9(AstBu)8(OH)2]·2, 5THF (5) umgewandelt.Bei der Reaktion von Me2GaCl mit tBuAsLi2 im Verhältnis 1:1 entstehen offensichtlich sehr basische Produkte, die das verwendete Silicon‐Schliffett angreifen und zum Aufbau eines 16‐kernigen (Li+‐Ionen) Komplexes mit [O(SiMe2O)n]2—‐Anionen (n = 2, 3), dem [Li16{OSiMe2OSiMe2OSiMe2O}2{OSiMe2OSiMe2O}4Cl4]·0, 5THF·0, 5DME (6) führt, dessen Kristallstruktur bestimmt wurde. 1—5 wurden sowohl durch NMR‐Spektren und schwingungsspektroskopische Methoden als auch mittels Röntgenstrukturanalysen charakterisiert. Besonders interessant sind die strukturellen Beziehungen der In—As‐Käfige im Vergleich zu bekannten Verbindungen oder Strukturtypen.So läßt sich der In—As‐Käfig von 1 als geöffnetes Rhombendodekaeder beschreiben, während beim Anion von 3 eine Asteran‐Struktur vorliegt, die ihrerseits von der Wurtzit‐Struktur abgleitet werden kann. Aus 3 kann 4 durch Käfigerweiterung mit Me2InOH‐Einheiten erklärt werde. Das In—As‐Gerüst in 5 ist als Kombination von Heterokuban‐ und Wurtzit‐Struktur aufzufassen. Nur das Gerüst in 2 läßt sich nicht auf einfache Weise ableiten; es besteht aus kondensierten Vier‐ und Sechsringen. 6 besteht aus einem Zusammenschluß von Ring‐ und Heterokuban‐Strukturelementen.
The Indium‐Rich Intermetallics YbCoIn5, YbRhIn5, and YbPtIn4
Authors: Zaremba Vasyl' I. , Rodewald Ute Ch. , Hoffmann Rolf‐Dieter , Kalychak Yaroslav M. , Pöttgen Rainer 
Published: July 2003

AbstractThe indium‐rich intermetallic compounds YbCoIn5 and YbRhIn5 were prepared from the elements in sealed tantalum tubes by the indium flux technique with a starting composition 1:1:7. The tubes were heated at 1320 K (YbCoIn5) and 1300 K (YbRhIn5) for six hours followed by slow cooling (5 K/h) to 670 K. YbPtIn4 was prepared in a sealed molybdenum crucible from an arc‐melted precursor alloy YbPtIn2 with additional indium (6 h at 1370 K followed by slow cooling at a rate of 5 K/h). The structures of the three indides were investigated by single crystal X‐ray data: P4/mmm, HoCoGa5 type, a = 455.90(7), c = 743.3(1) pm, wR2 = 0.0487, 173 F2 values for YbCoIn5, a = 459.52(6), c = 744.2(2) pm, wR2 = 0.0803, 238 F2 values for YbRhIn5 with 12 variables per refinement, and Cmcm, YNiAl4 type, a = 444.5(1), b = 1655.0(1), c = 751.6(1) pm, wR2 = 0.1036, 482 F2 values, 24 variables for YbPtIn4. The transition metal atoms in YbCoIn5 and YbRhIn5 have eight indium neighbors in a square prismatic coordination by indium atoms. These prisms are condensed via common edges forming layers. The ytterbium and further indium atoms are located between these layers. The ytterbium atoms are cuboctahedrally coordinated by twelve indium atoms. The cell volumes indicate intermediate‐valent or divalent ytterbium for YbCoIn5 and YbRhIn5. The YbPtIn4 structure consists of a three‐dimensional [PtIn4] network in which the ytterbium atoms are located in distorted hexagonal channels. Common structural motifs of the three structures are distorted bcc‐like indium cubes which resemble the structure of elemental indium.
Pentamethylcyclopentadienyl‐tantal(V)‐Komplexe (Cp*Ta) mit 1, 2, 3‐Triazolato‐Liganden
Authors: Herberhold Max , Goller Achim , Milius Wolfgang 
Published: July 2003

AbstractAusgehend von Cp*TaCl4 (1) wurden die Azidokomplexe {Cp*TaCl(N3)2(μ‐N3)}2 (2) und Cp*Ta(N3)Ph3 (3) dargestellt, die mit Acetylen‐dicarbonsäure‐dimethylester, MeOOC‐C≡C‐COOMe (a), unter [2+3]‐Cycloaddition zu den einkernigen 1, 2, 3‐Triazolato‐Komplexen Cp*TaCl(N3)2[N2N(Me)C(COOMe)C(COO)] (5) und Cp*TaPh3[N3C2(COOMe)2] (6) reagieren. Komplex 5 enthält einen N(3)‐methylierten 1, 2, 3‐Triazolato‐Chelatliganden, der über N(1) und einen 5‐Carboxylato‐Substituenten an Tantal(V) gebunden ist, während der 1, 2, 3‐Triazolato‐Ligand in 6 nur über N(2) koordiniert wird. Die einzähnig symmetrische Koordination des 1, 2, 3‐Triazolato‐Heterocyclus (wie in 6) tritt auch auf, wenn jeweils ein Chloroligand pro Cp*Ta in 2 oder in {Cp*TaCl2(μ‐OH)}2(μ‐O) (4) mit 1‐Trimethylsilyl‐4, 5‐di(methoxycarbonyl)‐1, 2, 3‐triazol (b) unter Me3SiCl‐Bildung reagiert; die Produkte (7 bzw. 8) bleiben zweikernig. Dagegen entstand bei der Umsetzung von Cp*TaCl4 (1) mit 1‐silylierten 1, 2, 3‐Triazolen unter Me3SiCl‐Abspaltung der einkernige Komplex des heterocyclischen Chelatliganden, Cp*TaCl3[N2N(R)C(COOR)C(COO)] (R = Me (9), Et (10)). Beide Typen von 1, 2, 3‐Triazolato‐Liganden liegen im Komplex Cp*TaCl2[N3C2(COOMe)2] [N2N(Me)C(COOMe)C(COO)] (11) vor, der durch Reaktion von 9 mit 4, 5‐Di(methoxycarbonyl)‐1, 2, 3‐triazol (e) in Gegenwart von NEt3 erhalten wurde.Die Strukturen der neuen Komplexe wurden anhand der IR‐, 1H‐ und 13C‐NMR‐Spektren abgeleitet; die Röntgenstrukturanalyse von 9 bestätigte die Bildung eines 5‐Carboxylat‐1, 2, 3‐triazolato‐Chelatliganden durch Wanderung einer Ester‐Methylgruppe nach N(3).
Molecular Structures of two Cyclic Bis(amino)tin Dichlorides and their NMR Spectroscopic Characterization in Solution. — The First 1, 3, 2‐Diazastanna‐[3]ferrocenophane
Authors: Wrackmeyer Bernd , Milius Wolfgang , Maisel Heidi E. , Vollrath Hendrik , Herberhold Max 
Published: July 2003

Abstract2, 2‐Dichloro‐1, 3‐bis(trimethylsilyl)‐1, 3, 2‐diazastanna‐[3]ferrocenophane (6) was prepared for the first time, characterized in solution by 1H, 13C, 15N, 29Si and 119Sn NMR spectroscopy, and in the solid state by X‐ray structural analysis. The cyclopentadienyl rings are almost parallel and the atoms Fe, C(1), N, Sn form a plane. For comparison, the synthesis of another cyclic bis(amino)tin dichloride (2) with the 1, 3, 2, 4, 5‐diazastannadisila‐cyclopentane ring was repeated, and the molecular structure of 2 was determined by X‐ray crystallography. The five‐membered heterocycle is almost planar, and most structural parameters of 2 compare favorably with those of 6. In contrast to the ferrocenophane 6, the heterocycle 2 is well soluble and stable in solution. Thus, it proved possible to carry out a number of non‐routine 1D and 2D heteronuclear double resonance experiments for 2 in order to determine the absolute signs of the coupling constants 1J(119Sn, 15N) (> 0), 2J(119Sn, 29Si) (> 0), 2, 3J(119Sn, 13C) (n = 2; > 0; n = 3: < 0) and 4J(119Sn, 1H) (119Sn‐N‐C‐C‐1H: < 0; 119Sn‐N‐Si‐C‐1H: > 0) in this type of compound for the first time.
The Successive Fragmentation of a Structurally Characterized Metalloid Cluster Anion in the Gas Phase: [Ga13(GaR)6]— → ··· → [Ga13]— + 6 GaR (R = C(SiMe3)3)
Authors: Weiß Katharina , Schnöckel Hansgeorg 
Published: July 2003

AbstractBy collisions with argon atoms in the gas phase (SORI‐CAD experiments by means of FT‐ICR mass spectrometry) the metalloid cluster ion [Ga19(C(SiMe3)3)6]— fragments in a very precise way detaching step by step neutral Ga(C(SiMe3)3) units and finally leading to the stable 40‐electron bare metal cluster [Ga13]—. In combination with quantum chemical calculations the exploration of the fragmentation process leads to an experimentally based understanding of the bond properties of many of the recently investigated metalloid gallium and aluminum clusters.
Struktur und Bindung in Thiazyldihalogeniden
Authors: Kessenich Elmar , Meyer Axel , Schulz Axel 
Published: July 2003

AbstractIn einer kombinierten experimentellen und theoretischen Studie wurden die Reaktionen von (NSCl)3 mit [Ph4P]X (X = Cl, Br, I) und mit [Me4N]F sowie die Reaktionen von NSCl2—‐Salzen mit [Ph4P]X‐Salzen untersucht. Es konnte gezeigt werden, dass sowohl NSF2—‐ als auch NSCl2—‐Salze relativ stabil sind, während NSBr2—‐ und NSI2—‐Salze schnell in S4N4 bzw. SNx zerfallen. Die Thermodynamik der Bildung als auch die Struktur und Bindung wurde auf CCSD(T)‐ und B3LYP‐Niveau für verschiedene Thiazylhalogenide (NSX, NSX2—, NSXY—; X, Y = H, F, Cl, Br und I) berechnet und diskutiert. Zusätzlich wurde auch das hypothetische NSH2—‐Ion in diese Überlegungen zum Vergleich miteinbezogen.
Binucleare Kupfer(I)‐Komplexe mit Oxalamidin‐Liganden: Zum Zusammenhang zwischen Festkörperstrukturen und sterischen Faktoren
Authors: Böttcher Lars , Walther Dirk , Görls Helmar 
Published: July 2003

AbstractOxalamidine R1‐N = C(NHR2)‐C(NHR2) = NR1 (H2A: R1, R2 = 4‐Tolyl; H2B: R1, R2 = Mesityl; H2C: R1 = 4‐Tolyl, R2 = Mesityl) reagieren nach Deprotonierung mit [(Ph3P)3CuCl] zu binuclearen Kupfer(I)‐Komplexen des Typs [(Ph3P)xCu2]L (1: x = 4, L = A; 2: x = 2, L = B; 3: x = 3, L = C) mit einer planaren Oxalamidinatbrücke zwischen den beiden Metallatomen. Für 1 mit dem sterisch anspruchslosen Liganden A ergibt sich eine tetraedrische Konfiguration beider CuI‐Zentren, von denen jedes zwei Ph3P‐Moleküle koordiniert. 2 mit dem sterisch anspruchsvollen Oxalamidinatliganden C koordiniert nur ein Phosphin pro CuI, das trigonal‐eben koordiniert ist. 3 enthält zwei CuI‐Zentralatome unterschiedlicher Koordination: Ein Metallatom ist von einem Phosphin und den zwei N‐Donoratomen umgeben, die die raumfüllenden Mesitylsubstituenten tragen, während das CuI an der gegenüberliegenden Seite der Oxalamidinatbrücke durch Koordination zweier Phosphine tetraedrische Umgebung erreicht.In Verbindungen des Typs [(Me3P)xCu2] L bildet Ligand L = A sowohl einen Komplex mit tetraedrischer CuI‐Koordination (4: x = 4) als auch eine Verbindung mit trigonal‐ebener Anordnung (5: x = 2), während B und C nur die Komplexe 6 und 7 mit trigonal‐ebener Umgebung des Zentralatoms bilden.Die Festkörperstrukturen von 1—6 wurden durch Kristallstrukturanalysen bestimmt. Sie zeigen den engen Zusammenhang zwischen den sterischen Parametern der Liganden (N‐Arylgruppen des Oxalamidinatbrücken, Substituenten in R3P) und der Struktur der binuclearen Komplexe.
[(Et3PNI)2I]Cl — ein Donor‐Akzeptorkomplex von N‐Iod(triethylphosphan)imin an Iodmonochlorid
Authors: Grebe‐Metz Jutta , Weller Frank , Dehnicke Kurt 
Published: July 2003

[Et3PNI)2I]Cl — a Donor‐Acceptor Complex of N‐Iodo(triethylphosphane)imine with Iodine Monochloride[(Et3PNI)2I]Cl (1) has been obtained by the reaction of the silylated phosphorane imine Me3SiNPEt3 with iodine monochloride in dichloromethane suspension in the presence of cesium fluoride. 1 is characterized by IR spectroscopy and by a crystal structure determination. Space group P21/n, Z = 4, lattice dimensions at —50 °C: a = 717.0(2), b = 1244.7(6), c = 1278.0(8) pm, β = 91.30(5)°, R1 = 0.0654. In the ionic structure of 1 the cation [(Et3PNI)2I]+ consists of two N‐iodo(triethylphosphane)imine molecules INPEt3, which are centrosymmetrically connected by I+ via their nitrogen atoms.
Organometallic Compounds of the Lanthanides. 168 [1] Lanthanidocene Complexes containing Sulfur‐functionalized Cyclopentadienyl Ligands
Authors: Schumann Herbert , Herrmann Katja , Mühle Stefan H. , Dechert Sebastian 
Published: July 2003

AbstractYCl3, SmCl3, and LuCl3 react with 2 equivalents of Na[C5H4CH2CH2SR] (R = Ph (2); Et (3)) yielding (PhSCH2CH2C5H4)2LnCl (Ln = Y (4a), Sm (4b), Lu (4c)), and (EtSCH2CH2C5H4)2LuCl (5), respectively. Methylation of 4a, 4c, and 5 with LiMe produces (PhSCH2CH2C5H4)2LnMe (Ln = Y (6a); Lu (6c)) and (EtSCH2CH2C5H4)2LuMe (7). YCl3 and LuCl3 react with 1 equivalent of 2 or 3 followed by 1 equivalent Na[C5Me5] to give (PhSCH2CH2C5H4)(C5Me5)LnCl (Ln = Y (8a); Lu (8c)) and (EtSCH2CH2C5H4)(C5Me5)YCl (9). [(EtSCH2CH2C5H4)(C5Me5)LuCl (10) and 1, 10‐bipyridine form [(EtSCH2CH2C5H4)(C5Me5)Lu(bipy)]+ [(EtSCH2CH2C5H4)(C5Me5)LuCl2]— (11). Methylation of 8a, 8c, and 9 with LiMe results in the formation of (PhSCH2CH2C5H4)(C5Me5)LnMe (Ln = Y (12a); Lu (12c)) and (EtSCH2CH2C5H4)(C5Me5)YMe (13). LaCl3 and PrCl3 react with 3 equivalents of 3 affording (EtSCH2CH2C5H4)3Ln (Ln = La (14d) and Pr (14e)), while the reaction of YbI2 with 2 equivalents of 3 gives [(EtSCH2CH2C5H4)Yb(SCH2CH2C5H4)]2 (15) along with ethane. The structures of 8c, 11, 14d, and 15 were determined by single‐crystal X‐ray diffraction.
Ruthenium Nanoparticles in Nanoporous Alumina Membranes: Preparation, Characterization and Catalytic Properties
Authors: Pelzer K. , Philippot K. , Chaudret B. , Meyer‐Zaika W. , Schmid G. 
Published: July 2003

AbstractRuthenium nanoparticles included in alumina membranes have been prepared either by dihydrogen decomposition of the complex Ru(COD)(COT) (COD = 1, 5‐cyclooctadiene; COT = 1, 3, 5‐cyclooctatriene) to give pre‐prepared colloidal solutions which were further used to fill the pores of nanoporous alumina membranes by vacuum induction, or by in situ decomposition. These hybrid systems were tested in the hydrogenation of 1, 3‐butadiene in the gas phase. The use of Ruthenium loaded membranes resulted in considerably increased activities compared with grinded samples.