bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characteristics of thermo‐ and photo‐stimulated electron emission from silicon wafers
Authors: Momose Yoshihiro , Satou Arata , Sakurai Takao , Nakayama Keiji 
Published: January 2008

AbstractThe temperature dependence of photoelectric emission and its spectral yield has been studied for Si (100) wafer surfaces with a native oxide film. The emission measurement was performed using a gas‐flow Geiger counter developed for examining real surfaces. The saturation emission observed as a function of temperatures between 26 and 350 °C under illumination with far ultraviolet rays had the average activation energy of 0.27 eV in the Arrhenius plot. The analysis of the spectral yield observed after the preillumination gave two almost temperature independent photoelectric thresholds of 4.84 ± 0.11 and 5.57 ± 0.15 eV. The difference between the former value and the indirect optical excitation threshold for a clean, cleaved silicon surface reported by Gobeli and Allen approximately agrees with the activation energy. This energy is interpreted as being due to a thermal process for electron transport from the silicon substrate to the SiO2/Si interface states. A new emitting center with optical activation energy of about 5.7 eV was also found for the preilluminated surfaces. Copyright © 2008 John Wiley & Sons, Ltd.
Ce 3d XPS investigation of cerium oxides and mixed cerium oxide (CexTiyOz)
Authors: Bêche Eric , Charvin Patrice , Perarnau Danielle , Abanades Stéphane , Flamant Gilles 
Published: January 2008

AbstractThis article presents an XPS study of Ce 3d emission spectra dominated by atomic multiplet effects in core level spectroscopy of rare earth compounds (Ce oxides). Core level spectroscopy has been used to study the electronic states of Ce 3d5/2 and Ce 3d3/2 levels in Ce4+ and Ce3+ states. The well‐resolved components of Ce 3d5/2 and Ce 3d3/2 spin‐orbit components, due to various final states (4f0, 4f1, 4f2 configurations), were determined on 3d XPS spectra from commercial powders (CeO2, CePO4).These results were used to study the 3d spin‐orbit component of mixed cerium‐titanium oxide.This compound was prepared by co‐melting commercial powders of CeO2 and TiO2 at 1800 K under air using a solar furnace with a flux density of 16 MW.m−2 at the focal point of the parabolic concentrator. The mixed oxide Ce2Ti2O7 was produced and contained Ce(III) species which may be reactive with water to give back the initial metal oxides and generate hydrogen, a valuable product considered as a promising energy carrier in the future in replacement of oil.The 3d photoemission spectra revealed the presence of mixed components attributed to mainly Ce(III) and Ce(IV) species. Copyright © 2008 John Wiley & Sons, Ltd.
On the development of long‐range order in ultra‐thin amorphous Al2O3 films upon their transformation into crystalline γ‐Al2O3
Authors: Jeurgens L. P. H. , Reichel F. , Frank S. , Richter G. , Mittemeijer E. J. 
Published: January 2008

AbstractThe changes in the local chemical environments of Al and O ions in ultra‐thin (<1 nm) amorphous Al2O3 films on Al{111} and Al{100} substrates during their transformation into γ‐like‐Al2O3 have been deduced from the corresponding changes in the so‐called Auger parameters for Al and O (as measured using XPS), in combination with structural analysis by high resolution transmission electron microscopy and low‐energy electron diffraction. It is demonstrated that the difference between the O and Al Auger parameters can be employed to monitor the change in polarisation state of the O anions in the oxide film during the amorphous‐to‐crystalline transition. It follows that (i) the amorphous‐to‐crystalline transition occurs at higher temperatures (starting at T > 425 K) for the oxide films grown on Al{111} than for the oxide films formed on Al{100} (starting at T < 400 K) and (ii) the low‐mismatch (epitaxial) crystalline oxide films on Al{111} possess a higher degree of crystalline order as compared to the high‐mismatch oxide films formed on Al{100}. Copyright © 2008 John Wiley & Sons, Ltd.
REEL spectra from aluminium: experiment and Monte Carlo simulation using two different dielectric functions
Authors: Dapor Maurizio , Calliari Lucia , Filippi Massimiliano 
Published: January 2008

AbstractWithin the framework of the dielectric theory, the spectral response of a solid irradiated by an electron beam is described by the energy loss function.In the limit of zero momentum transfer, the dielectric function is generally known from optical data for many materials. The main problem, when electron beams are involved, concerns the extension of the dielectric function from the optical limit to non‐zero momentum transfer.This extension requires introducing a dielectric function, which depends on both energy loss and momentum transfer.Using Al–representative of a dilute gas of free electrons–as a case study, the present work compares two Monte Carlo (MC) simulations with experimental reflection electron energy loss (REEL) spectra excited by 2 keV electrons. To obtain the two MC simulated spectra, the dielectric function was modelled, respectively, according to Ashley (1988) and according to an early suggestion by Ritchie and Howie (1977), later reconsidered by Yubero and Tougaard (1992).MC simulated REEL spectra obtained according to the latter model reproduce the experimental REEL spectra better than those obtained using the Ashley dielectric function. The comparison involves not only the single scattering plasmon peak (bulk and surface) but also multiple scattering peaks. Copyright © 2008 John Wiley & Sons, Ltd.
Imputation‐based strategies for clinical trial longitudinal data with nonignorable missing values
Authors: Yang Xiaowei , Li Jinhui , Shoptaw Steven 
Published: January 2008

AbstractBiomedical research is plagued with problems of missing data, especially in clinical trials of medical and behavioral therapies adopting longitudinal design. After a literature review on modeling incomplete longitudinal data based on full‐likelihood functions, this paper proposes a set of imputation‐based strategies for implementing selection, pattern‐mixture, and shared‐parameter models for handling intermittent missing values and dropouts that are potentially nonignorable according to various criteria. Within the framework of multiple partial imputation, intermittent missing values are first imputed several times; then, each partially imputed data set is analyzed to deal with dropouts with or without further imputation. Depending on the choice of imputation model or measurement model, there exist various strategies that can be jointly applied to the same set of data to study the effect of treatment or intervention from multi‐faceted perspectives. For illustration, the strategies were applied to a data set with continuous repeated measures from a smoking cessation clinical trial. Copyright © 2008 John Wiley & Sons, Ltd.
[{μ‐Cy8Si8O13}2Ca(DME)Ca(THF)2] – The First Metallasilsesquioxane Derivative of a Heavier Alkaline Earth Metal
Authors: Lorenz Volker , Blaurock Steffen , Edelmann Frank T. 
Published: January 2008

Abstract[{μ‐Cy8Si8O13}2Ca(DME)Ca(THF)2] (2), the first metallasilsesquioxane derivative of a heavier alkaline earth metal, has been prepared by a reaction of Cy7Si7O9(OH)3 (1) with metallic Ca in liquid ammonia / THF followed by recrystallization from DME. In the course of the reaction ligand rearrangement under formation of the (Cy8Si8O13)− dianion takes place. In the dinuclear calcium complex 2 the anionic silsesquioxane cages act as bridging ligands. The Ca2+ ions are unsymmetrically coordinated by THF and DME molecules.
[Cp2TiNi(S2N2)2] – The First Organometallic Derivative of [Ni(S2N2H)2]
Authors: Edelmann Frank T. , Blaurock Steffen , Lorenz Volker , Chivers Tristram 
Published: January 2008

AbstractThe synthesis and structural characterization of the first organometallic derivative of [Ni(S2N2H)2] (1) are reported. Treatment of K2[Ni(S2N2)2] (2) with stoichiometric amounts of [Cp2TiCl2] in boiling toluene afforded black, crystalline [Cp2TiNi(S2N2)2] (3) in 50 % yield. According to a single‐crystal X‐ray diffraction study, the novel heterobimetallic complex 3 comprises a nearly planar TiNi(S2N2)2 arrangement. The Ti···Ni separation in 3 is 2.8348(5) Å, a value that is typical for bridged early‐late heterobimetallic complexes.
Synthesen, Kristallstrukturen und Drillingsbildung der Cluster‐Trimere Bi2[PtBi6Br12]3 und Bi2[PtBi6I12]3
Authors: Günther Anja , Steden Folker , Ruck Michael 
Published: January 2008

AbstractSyntheses, Crystal Structures, and Triple Twinning of the Cluster Trimers Bi2[PtBi6Br12]3 and Bi2[PtBi6I12]3Melting reactions of Bi with Pt and BiX3 (X = Br, I) yield shiny black, air insensitive crystals of the subhalides Bi2[PtBi6X12]. Bi2[PtBi6Br12]3 crystallizes in the monoclinic space group C2/m with lattice parameters a = 1617.6(2) pm, b = 1488.5(1) pm, c = 1752.4(2) pm, and β = 110.85(4)°. Bi2[PtBi6I12]3 adopts the triclinic space group $C{\bar 1}$ with pseudo‐monoclinic lattice parameters a = 1711.2(2) pm, b = 1585.1(1) pm, c = 1865.7(2) pm, and α = 90°, β = 111.15(4)°, γ = 90°. The two homoeotypic compounds consist of cuboctahedral [Pt−IIBiII6X−I12]2− clusters that are concatenated into linear trimers by BiIII atoms. The ordered distribution of BiIII atoms destroys the inherent threefold rotation axes in the packing of cluster anions. As a consequence of the pseudosymmetry the crystals are triple twinned along [201]. Due to different orientations of the cluster trimers there are two BiII···X inter‐cluster bridges per BiII atom in Bi2[PtBi6Br12]3 but only one bridge in Bi2[PtBi6I12]3. The structure of the iodine compound can be deduced from the NaCl structure type, leaving 37 of 96 atomic positions unoccupied. The arrangement of the cuboctahedral clusters follows the motif of a body‐centered cubic packing.
Hexachloroplatinates of the Lanthanides: Syntheses and Thermal Decomposition of [M(NO3)2(H2O)6]2[PtCl6]·2H2O (M = La, Pr) and [M(NO3)(H2O)7][PtCl6]·4H2O (M = Gd, Dy)
Authors: Arndt Annika , Posavec Damir , Schwarzer Stefan , Wickleder Mathias S. 
Published: January 2008

AbstractThe reaction of the nitrates M(NO3)3·6H2O (M = La, Pr) and (H3O)2PtCl6 led to yellow single crystals of [M(NO3)2(H2O)6]2[PtCl6]·2H2O (M = La, Pr) (monoclinic, P21/c, Z = 2, La/Pr: a = 697.4(3)/695.5(1), b = 1654.5(1)/1652.5(2), c = 1317.7(6)/1318.5(3) pm, β = 93.97°(7)/93.93°(2), Rall = 0.0169/0.0659) while the reaction of M(NO3)3·5H2O (M = Gd, Dy) and (H3O)2PtCl6 yielded yellow single crystals of [M(NO3)(H2O)7][PtCl6]·4H2O (monoclinic, P21/n, Z = 4, Gd/Dy: a = 838.72(3)/838.40(2), b = 2131.98(6)/2139.50(7), c = 1142.63(3)/1143.10(3) pm, β = 95.670(4)/95.698(3), Rall = 0.0475/0.0337). The crystal structures consist of octahedral [PtCl6]2− anions and complex [M(NO3)2(H2O)6]2+ and [M(NO3)(H2O)7]2+ cations, respectively. The thermal decomposition of both types of compounds leads via various steps to elemental platinum and the oxide chlorides MOCl (M = La, Pr, Gd, Dy).
Synthesis, Crystal Structure and Magnetism Characterization of Two Coordination Polymers based on Ni(2‐mpac)2(H2O)2 as Molecular Building Block
Authors: Chen San‐Ping , Fan Guang , Gao Sheng‐Li 
Published: January 2008

AbstractTaking Ni(2‐mpac)2(H2O)2 as molecular building block, two novel coordination polymers with the formula of [Ni(2‐mpac)2(4,4′‐bpy)·(4,4′‐bpy)]n (1) and [Ni(2‐mpac)2(py)·4H2O]n (2) (2‐mpac = 5‐methyl‐2‐pyrazinecarboxylic acid; 4,4′‐bpy = 4,4′‐bipyridine; py = pyrazine) have been synthesized and structurally characterized by X‐ray single crystal diffraction method. In addition, elemental analysis, IR and magnetism characterization are presented.
[{Er(NC5H4COOH)(H2O)2}2(H5O2)(HgCl5)(HgCl4)2(H2O)2]n – Synthesis, Crystal Structure and Properties
Authors: Chen Wen‐Tong , Xu Ya‐Ping , Luo Qiu‐Yan , Fang Xiao‐Niu , Chen Hua‐Long 
Published: January 2008

AbstractThe first heterometallic 4f‐5d inorganic‐organic metal‐isonicotinic acid hybrid [{Er(NC5H4COOH)(H2O)2}2(H5O2)(HgCl5)(HgCl4)2(H2O)2]n (1) has been synthesized via hydrothermal reaction and structurally characterized. Complex 1 crystallizes in the space group C2/c of the monoclinic system with four formula units per unit cell: a = 24.194(3), b = 20.792(3), c = 15.289(4) Å, β = 128.39(2)°, V = 6028(2) Å3, C36H47Cl13Er2Hg3N6O20, Mr = 2280.94, Dc = 2.513 g/cm3, S = 0.929, μ(MoKα) = 11.017 mm−1, F(000) = 4248, R = 0.0425 and wR = 0.0739. The crystal structure analysis reveals that the title complex is characteristic of a one‐dimensional chain‐like structure. Photoluminescent investigation reveals that the title complex displays interesting emissions. Optical absorption spectra of 1 reveal the presence of an optical gap of 3.45 eV. The magnetic properties show that complex 1 exhibits antiferromagnetic interactions.
Preparation and Structure of Melemium Melem Perchlorate HC6N7(NH2)3ClO4·C6N7(NH2)3
Authors: Sattler Andreas , Schnick Wolfgang 
Published: January 2008

AbstractA new perchlorate salt of melem (2,6,10‐triamino‐s‐heptazine, C6N7(NH2)3) was obtained from an aqueous solution of HClO4 at lower concentration than the ones reported for the synthesis of melemium perchlorate monohydrate (HC6N7(NH2)3)ClO4·H2O. The new salt was identified as melemium melem perchlorate (HC6N7(NH2)3)ClO4·C6N7(NH2)3 representing a melem adduct of water free melemium perchlorate. The crystal structure was solved by single‐crystal X‐ray methods ($P{\bar 1}$, no. 2, Z = 2, a = 892.1(2), b = 992.7(2), c = 1201.5(2) pm, α = 112.30(3), β = 96.96(3), γ = 95.38(3)°, V = 965.8(4)·106 pm3, 4340 data, 387 parameters, R1 = 0.039). Melemium melem perchlorate crystallizes in a layer‐like structure containing both protonated HC6N7(NH2)3 and non protonated C6N7(NH2)3 moieties in the coplanar layers as well as perchlorate ions between them, all of which being interconnected by hydrogen bonds. Vibrational spectroscopic investigations (FTIR and Raman) of the salt were conducted.
Synthesis and Structure of the Cerium Schiff‐Base Complexes [Ce(Salen′)2] and [(THF)2KCe(Salen′)2]
Authors: Gottfriedsen Jochen , Spoida Marlies , Blaurock Steffen 
Published: January 2008

AbstractThe synthesis of [Ce(Salen′)2] (1) (H2Salen′ = N,N′‐bis(3,5‐di‐tert‐butylsalicylidene)ethylenediamine) was performed using two different approaches. CeCl3 reacts with two equivalents of K2Salen′ in THF under the formation of [(THF)2KCe(Salen′)2] (2). Complex 2 could be converted to the CeIV complex 1 via oxidation with p‐benzoquinone and air, respectively. The reversible reduction process was realized using elemental potassium in boiling THF. Furthermore, the reaction of the CeIV starting material [(tBuO)4Ce(THF)2] with the “free” ligand H2Salen′ in boiling toluene lead in the formation of 1 as well.
Solvothermal Synthesis, Crystal Structure and Properties of a New Organic Templated Lanthanum Sulfate [C4N3H16][La(SO4)3(H2O)]
Authors: Zhu Yalin , Zhou Guangpeng , Xu Yan , Zhu Dunru , Zheng Xuefang 
Published: January 2008

AbstractA new organic templated lanthanum sulfate [C4N3H16][La(SO4)3(H2O)] (1) has been solvothermally synthesized by using n‐butanol as solvent. The colorless block crystals were characterized by IR, TGA, ICP, and XRD. The structure was determined by single‐crystal X‐ray diffraction: Monoclinic, P21/c, a = 10.8878(19), b = 15.478(3), c = 9.9639(18) Å, β = 114.062(2)°, V=1533.2(5) Å3, Z = 4]. Crystal structure analysis shows that the one dimensional chain of 1 consists of the LaO9 polyhedra and the sulfate groups. Coordination water molecules link adjacent chains by using hydrogen bonds to generate 2D layers, whereas the organic amines are inserted between the layers. The formation of 1 demonstrates that solvents play an important role during the synthesis.
Syntheses and X‐Ray Structures of Zinc Amidinate Complexes
Authors: Eisenmann Tamara , Khanderi Jayaprakash , Schulz Stephan , Flörke Ulrich 
Published: January 2008

AbstractReactions of ZnX2 (X = Cl, Br) with equimolar amounts of Li[t‐BuC(NR)2] (R = i‐Pr, Cy) yielded mono‐amidinate complexes [{t‐BuC(NR)2}ZnX]2 (X = Cl, R = i‐Pr 1, Cy 2; X = Br, R = i‐Pr 3, Cy 4), whereas reactions with two equivalents of Li‐amidinate resulted in the formation of the corresponding bis‐amidinate complexes [t‐BuC(NR)2]2Zn (R = i‐Pr 5, Cy 6). 1 ‐ 6 were characterized by elemental analyses, IR, mass and multinuclear NMR spectroscopy (1H, 13C), and single crystal X‐ray analysis (1, 2, 3, 6). In addition, the single crystal X‐ray structure of [t‐BuC(NCy)2]ZnBr·LiBr(OEt2)2 7, which was obtained as a byproduct in low yield from re‐crystallization experiments of 4 in Et2O, is reported.
A One‐Dimensional Pyrazine Bridged Copper(II)‐Saccharinato Coordination Polymer
Authors: Senel Evrim , Yilmaz Veysel T. , Kazak Canan 
Published: January 2008

AbstractA one‐dimensional copper(II) complex {[Cu(sac)2(μ‐pyz)(H2O)]·H2O}n (1) (pyz = pyrazine, and sac = saccharinate) has been synthesized and characterized by elemental analysis, IR spectroscopy, thermal and single crystal X‐ray analyses. Complex 1 crystallizes in the triclinic space group $P{\bar 1}$. The [Cu(sac)2(H2O)] units are bridged by pyz leading to a one‐dimensional alternating chain in which the copper(II) ions exhibit a distorted square–pyramidal coordination of CuN4O. The intradimer Cu···Cu distance is 6.881Å, while interdimer Cu···Cu distance is 7.066Å. The supramolecular interactions are mainly controlled by the sac anion and water molecules. The individual chains are linked by strong OW–H···O(sac) hydrogen bonds into a two‐dimensional layers, which are further arranged in a three‐dimensional supramolecular network by aromatic π(sac)···π(sac) stacking interactions and CH···π(pyz) interactions. Thermal analysis of complex 1 shows that the decompositions of the aqua, pyz and sac ligands are observed as distinct steps on the DTA and TG curves.
Elektrochemische Synthese von Perowskiten im System K/Ba/Pr/Bi/O
Authors: Oberndorfer C. P. M. , Konuma M. , Jansen M. 
Published: January 2008

AbstractElectrochemical Synthesis of Perovskites in the System K/Ba/Pr/Bi/OAn easy procedure for the synthesis of well crystalline samples of (K,Ba)(Pr,Bi)O3 is provided by anodic oxidation of melts consisting of Ba(OH)2 / KOH / Pr(NO3)3 / Bi(NO3)3, at comparatively low temperatures of about 220 °C. We have explored the influence of different parameters like temperature, potential of the working electrode, and composition of the electrolyte. Chemical and thermal analyses were performed. Products obtained at different experimental conditions revealed different Ba/K and Pr/Bi ratios with a large homogeneity range. X‐Ray powder diffraction and single crystal structure analyses of KxBa1−xPryBi1−yO3 proved these compounds to be cubic perovskites. Barium and potassium ions are disordered occupying the A‐sites while praseodym and bismuth ions share the B‐sites or are ordered, as indicated by a doubling of the lattice parameter. The composition x and y can independently be altered. XPS analysis and physical properties are reported and discussed.
Halogenide der Seltenerdmetalle Ln4X5Z. Teil 3: Das Chlorid La4Cl5B4 – Präparation, Struktur und Verwandtschaft zu La4Br5B4, La4I5B4
Authors: Mattausch Hansjürgen , Oeckler Oliver , Simon Arndt 
Published: January 2008

AbstractRare Earth Halides Ln4X5Z. Part 3: The Chloride La4Cl5B4 – Preparation, Structure, and Relation to La4Br5B4, La4I5B4La4Cl5B4 is synthesized by reaction of LaCl3, La metal and boron in sealed Ta containers at 1050 °C < T < 1350 °C. It crystallizes in the monoclinic space group C2/m with a = 16.484(3) Å, b = 4.263(1) Å, c = 9.276(2) Å and β = 120.06(3)°. Ce4Cl5B4 is isotypic, a = 16.391(3) Å, b = 4.251(1) Å, c = 9.180(2) Å and β = 120.20(3)°. The La atoms form strings of trans‐edge shared La octahedra, and the B atoms inside the strings form B4‐rhomboids, which are condensed to chains via opposite corners. The Cl atoms interconnect the channels according to La2La4/2Cli−i6/2Cli−a2/2Cla−i2/2. The crystal structures of the bromide and the iodide are comparabel, however, the interconnection of the strings is different in the three structure types, as 14 Cl, 13 Br and 12 I atoms surround the La6 octahedra.
Mixed Valence Tungsten(IV,V) Compounds with Layered Structures (Part II)): Synthesis and Crystal Structures of Cu1−x[W2O2Cl6] and Cu1−x[W4O4Cl10]
Authors: Beck Johannes , Kusterer Christian 
Published: January 2008

AbstractThe reaction of CuCl with WOCl3 at 400 °C leads to a mixture of Cu1−x[W2O2Cl6] (1) and Cu1−x[W4O4Cl10] (2) in form of black lustrous needles. Both compounds crystallize in space group C2/m with a = 12.7832(5) Å, b = 3.7656(2) Å, c = 10.7362(3) Å, β = 119.169(2)° for 1 and a = 12.8367(19) Å, b = 3.7715(7) Å, c = 15.955(3) Å, β = 102.736(5)° for 2. The structures are made up of WO2Cl4 octahedra. In the case of 1 two octahedra are edge‐sharing via chlorine atoms to form pairs which are linked via the trans‐positioned oxygen atoms to form infinite double strands $^{\infty}_{1}\rm [W_{2}O_{4/2}Cl_{2/2}Cl_{4}]$. In the structure of 2 two of these double strands are condensed via terminal chlorine atoms to form quadruple strands $^{\infty}_{1}\rm [W_{4}O_{8/2}Cl_{6/2}Cl_{4}]$. Like for all members of the Mx[W2O2X6] structure family (X = Cl, Br) nonstochiometry with respect to the cations M was observed. The copper content of 1 and 2 was derived from the site occupation factors of the respective structure refinements. For several crystals examined the copper content varied between x = 0.27 and 0.17 for 1 and x = 0.04 for 2. In both structures the oxochlorotungstate strands are negatively charged and connected to layers by the monovalent copper ions, which are tetrahedrally coordinated by the non‐bridging chlorine atoms of the strands. The structure models imply disorder of the Cu+ ions over closely neighboured sites.
Synthesis and Structural Features of a New Diselenonium Dication Stabilized by Sulfur Atoms of Thiourea Groups: X‐ray Characterization of [(Se‐ettu)2]Br2 (ettu = ethylenethiourea)
Authors: Schulz Lang Ernesto , Manzoni de Oliveira Gelson , Tabarelli Greice 
Published: January 2008

AbstractSelenium and bromine were refluxed in methanol and stirred with ethylenethiourea to give yellow crystals of [(Se‐ettu)2]Br2 (ettu = ethylenethiourea). The first reported 1,2‐diselenonium dication stabilized by sulfur atoms is air unstable and yields a three‐dimensional lattice with Se+···Br−···Se+ bridges enclosing also single Se+···Br− interactions and H···Br− bonds. The air instability of [(Se‐ettu)2]Br2 probably is due to redox reactions which lead to the decomposition of ethylenethiourea with precipitation of sulfur.
Seltenerdhalogenide Ln4X5Z. Teil 1: C und/oder C2 in Ln4X5Z
Authors: Mattausch Hansjürgen , Schaloske Manuel C. , Hoch Constantin , Zheng Chong , Simon Arndt 
Published: January 2008

AbstractRare Earth Halides Ln4X5Z. Part 1: C and/or C2 in Ln4X5ZThe compounds Ln4X5Cn (Ln = La, Ce, Pr; X = Br, I and 1.0 < n < 2.0) are prepared by the reaction of LnX3, Ln metal and graphite in sealed Ta‐ampoules at temperatures 850 °C < T < 1050 °C. They crystallize in the monoclinic space group C2/m. La4I5C1.5: a = 19.849(4) Å, b = 4.1410(8) Å, c = 8.956(2) Å, β = 103.86(3)°, La4I5C2.0: a = 19.907(4) Å, b = 4.1482(8) Å, c = 8.963(2) Å, β = 104.36(3)°, Ce4Br5C1.0: a = 18.306(5) Å, b = 3.9735(6) Å, c = 8.378(2) Å, β=104.91(2)°, Ce4Br5C1.5: a = 18.996(2) Å, b = 3.9310(3) Å, c = 8.282(7) Å, β = 106.74(1)°, Pr4Br5C1.3: a = 18.467(2) Å, b = 3.911(1) Å, c = 8.258(7) Å, β = 105.25(1)° and Pr4Br5C1.5: a = 19.044(2) Å, b = 3.9368(1) Å, c = 8.254(7) Å, β = 106.48(1)°.In the crystal structure the lanthanide metals are connected to Ln6‐octahedra centered by carbon atoms or C2‐groups. The Ln6‐octahedra are condensed via opposite edges to chains and surrounded by X atoms which interconnect the chains. A part n of isolated C‐atoms is substituted by 1‐n C2‐groups. The C‐C distances range between 1.26 and 1.40Å. In the ionic formulation (Ln3+)4(X−)5(C4−)n(C2m−)1−n·e− with 0 < n < 1 and m = 2, 4, 6 (C22−, C24− C26−), there are 1 < e− < 5 electrons centered in metal‐metal bonds.