bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selbsttragende Glasdächer mit lastabtragender Verglasung
Authors: Weller Bernhard , Reich Stefan , Ebert Jan 
Published: January 2010

AbstractDas Institut für Baukonstruktion, Technische Universität Dresden, ist maßgeblich an der Entwicklung von selbsttragenden, transparenten Glasdachkonstruktionen beteiligt. Der vorliegende Beitrag beschreibt das Grundprinzip einer solchen materialeffizienten Struktur. Ausgehend von zweilagigen Stahlraumfachwerken werden geeignete Geometrien identifiziert, die es erlauben, alle Stäbe der Druckebene durch in ihrer Ebene lastabtragende Verglasung zu ersetzen. Die Kraftweiterleitung der Glasscheiben geschieht durch in den Ecken angeordnete Knotenpunkte. Neben statischen Berechnungen wurden an kleineren Prüfkörpern als auch an Versuchsfeldern von bis zu 15 m Länge umfangreiche Versuche durchgeführt, die Schwerpunkt des Beitrages sind. Sie umfassen die Lasteinleitung, das Stabilitätsverhalten der Scheiben, die Tragfähigkeit des Gesamtsystems als auch die Betretbarkeit und Resttragfähigkeit.
Glasdach für den Hurlingham Gentlemen's in London
Authors: Laufs Wilfried , Luessi Walter 
Published: January 2010

AbstractDer Aufsatz behandelt ein elegantes Stahl‐Glasdach für den Gentlemen's Club Hurlingham in London, basierend auf einem Vorbild des zerstörten historischen Originals, bestehend aus einer langgezogenen Halbtonne, welche in eine Halbkuppel mündet und mit einer neuartigen, facettierten Verglasung eingedeckt ist. Beschrieben werden der integrierte Entwurfsprozess und seine ingenieurmäßige Ausarbeitung samt seiner Besonderheiten in der Detaillierung sowie der Herstellungs‐ und Montageprozess des transparenten Daches. Gezeigt wird, wie alle bautechnisch relevanten Aspekte des Glasdachs in den statischen Entwurf bereits von Beginn der Planung an integriert wurden.
Hybridbauteile im Konstruktiven Glasbau
Authors: Weller Bernhard , Härth Kristina , Werner Frank , Hildebrand Jörg 
Published: January 2010

AbstractTräger und Stützen werden zunehmend in Glas ausgeführt. Die Sprödigkeit des Werkstoffes Glas erschwert dabei einen optimalen Einsatz. Innovative Klebtechnik ermöglicht die stoffschlüssige Verbindung von Glas mit duktilen Werkstoffen zu Hybridelementen. Transparente Kunststoffzwischenschichten in Kombination mit Klebstoffschichten können die Übertragung von Schubkräften in optimierten Querschnitten übernehmen und sorgen für ausreichende Resttragfähigkeiten. Diese Art von zusammengesetzten Querschnitten erhöht die Sicherheit und die Leistungsfähigkeit von konstruktiven Glasbauteilen. Im Rahmen eines DFG‐Forschungsprojektes werden innovativ geklebte Hybridbauteile experimentell und numerisch untersucht. Werkstoffuntersuchungen an Kunststoffen und Klebstoffen sowie Festigkeitsuntersuchungen der Glaskanten in verschiedenen Qualitäten bilden die Grundlage komplexer Betrachtungen. Größere Hybridbauteile werden anschließend Tragfähigkeitsprüfungen und Klimabelastungen unterzogen. Entsprechende Ausführungsbeispiele verdeutlichen die Erweiterung des Einsatzes von tragendem Glas.
Geklebte Stahl‐Glas‐Verbundtragwerke
Authors: Bucak Ömer , Geiß Paul Ludwig , Kötter Mark Pascal , Bues Martin , Illguth Marcus 
Published: January 2010

AbstractDer aktuelle Trend in der Architektur wird durch äußerst filigrane, schlanke und leichte Konstruktionen bestimmt. Gerade durch den Einsatz des Baustoffes Glas in Kombination mit metallischen Verbindungselementen, kann dies optimal verwirklicht werden. In einem Forschungsprojekt der Hochschule München und der TU Kaiserslautern wird mit der Klebtechnik ein neues Fügeverfahren für Stahl‐Glas‐Verbundtragwerke eingesetzt. Hierbei wurden geeignete Klebstoffsysteme ausgewählt, Kleinbauteilversuche durchgeführt, praktikable Fertigungsverfahren erarbeitet, umfangreiche theoretische Betrachtungen angestellt sowie zum Projektabschluss mehrere Stahl‐Glas‐Hybridtragwerk‐Demonstratoren mit Spannweiten bis zu 11 m gefertigt.
Innovative Glaskonstruktionen in Amerika
Authors: Schober Hans , Dunham Michael , Justiz Stefan 
Published: January 2010

AbstractIn New York entsteht derzeit am 11 Times Square ein 40‐stöckiges Bürohochhaus mit einer neuartigen Stahl‐Glas‐Konstruktion für die über vier Stockwerke reichende verglaste Eingangslobby.Die hybride Fassadenkonstruktion besteht aus 16,5 m langen, stehenden Schwertern aus tragendem Glas mit Edelstahlgurten und die Queraussteifung erfolgt über die Glasscheiben der Fassade. Als weithin sichtbares Eingangselement wurde ein beleuchtetes gläsernes Prisma entworfen, das ebenfalls über vier Stockwerke reicht und die äußere Plaza mit der inneren Lobby verbindet.Darüber hinaus werden folgende Projekte unseres Büros kurz vorgestellt:– die Luminous Glass Shell der Bank of America, Charlotte– die Glastreppe für das Four Seasons Center of Performing Arts in Toronto– die Seilnetzfassaden für das 7 World Trade Center, den Freedomtower und das Time Warner Center in Manhattan.
Friedrich August Siemens – Glastechniker in Dresden
Authors: Weller Bernhard 
Published: January 2010

AbstractDie wesentliche Periode seines Schaffens wurde für Friedrich Siemens die Tätigkeit in seiner Dresdner Glasfabrik. Im Oktober 1867 gelang ihm, angeregt durch die Erfolge seiner glastechnischen Versuche, erstmalig den intermittierenden Betrieb der Glasherstellung auf den kontinuierlichen umzustellen. Friedrich Siemens revolutionierte mit der kontinuierlich arbeitenden Glasschmelzwanne die gesamte Glasindustrie und bereitete den Weg zur modernen automatisierten Glasproduktion.
ITO‐coatings by reactive low‐voltage ion plating: film properties and plasma analysis
Authors: Huber Daniel , Pulker H.K 
Published: January 2010

AbstractTransparent conductive oxides (TCO) are widely used materials for multifarious applications. According to today's state of knowledge, indium‐tin‐oxide (ITO) still offers the best electrical properties among numerous TCOs. However, ITO films produced by ion plating have only rarely been reported to be investigated. For most coating processes, ITO films need to be deposited under high temperature conditions (some 100 °C substrate heating) or require post‐deposition heat treatment in order to obtain high film quality. In this study, reactive low‐voltage ion plating (RLVIP) was used, which allows ‐ due to plasma assistance during the coating process ‐ deposition of ITO films at temperatures below 100 °C. Essential film properties, i.e. resistivity and optical transmission, were optimised by variation of arc current, gas pressure and deposition rate. These quantities ‐ particularly arc current and gas pressure ‐ have huge influence on the characteristics of the supporting plasma. This was shown by analysing the plasma with a mass‐spectrometric plasma monitoring system and with a Langmuir probe. In comparison with formerly studied coating materials (Ta2O5,Nb2O5,HfO2), different plasma compositions regarding the presence of metal oxide ions were determined, which could be attributed to elemental and molecular energy properties (ionisation and binding energies).
Important Roles of Weak Interactions: Syntheses and Supramolecular Structures of Four CoII/NiII‐Thiocyanato Compounds
Authors: Lu Jing , Liu Hou‐Ting , Zhang Xian‐Xi , Wang Da‐Qi , Niu Mei‐Ju 
Published: January 2010

AbstractFour thiocyanato complexes with CoII and NiII, [Co(NCS)2(htm)2(H2O)2][Co(NCS)2(H2O)4]·H2O (1), [Ni(NCS)2(htm)(CH3OH)2(H2O)] (2), [Ni(NCS)4(Hhtm)2] (3), and [Co(NCS)2(apm)2(H2O)2]·2H2O (4) (htm = hexamethylenetetramine, apm = 2‐aminopyrimidine), were synthesized and characterized by single‐crystal X‐ray diffraction analyses. For compounds 1–4, NCS– acts as terminal ligand and coordinates to the metal ion through the nitrogen atom. The uncoordinated sulfur atom is involved in hydrogen bonds, which link these discrete units to form 3D supramolecular structures. For compounds 2 and 3, these networks are further stabilized by van der Waals S···S interactions. According to the analytical data of compounds 1–4 and some reported discrete thiocyanato compounds, it can be concluded that the presence of S···S interaction or not may be determined by the metal and NCS– ratio, as well as by the size of the ligand.
A Trinuclear Iron(III) Complex Containing the Semi‐Cubane [Fe3(μ3‐O)]7+ Core: Structural, Spectroscopic, Magnetic and Electrochemical Study
Authors: Lalia‐Kantouri Maria , Papadopoulos Christos D. , Hatzidimitriou Antonios G. , Bakas Thomas , Pachini Sofia 
Published: January 2010

AbstractA trinuclear iron(III) oxo‐centered complex [Fe3(μ3‐O)(3‐OCH3‐salnec)3]OH·5H2O was synthesized and characterized as cluster containing the semi‐cubane [Fe3(μ3‐O)]7+ core. The central oxygen atom is bridging the three iron(III) ions, which form an equilateral triangle with an average edge of –3.00 Å as it was deduced from X‐ray diffraction studies. The new tetradentate ligand 3‐OCH3‐salnecH2 = 1‐[1‐hydroxy‐2‐(9′‐methyl‐1,10′‐phenanthrolin‐2‐yl)ethyl]‐3‐methoxyphenol‐2, was generated “in situ” during the synthesis process as a product of the addition reaction between the starting ligands 2,9‐dimethyl‐phenanthroline(neoc) and 3‐methoxy‐salicylaldehyde(3‐OCH3‐saloH2), in the presence of sodium methoxide and Fe3+. Variable‐temperature magnetic measurements indicate antiferromagnetic exchange interactions between the iron(III) ions in the cluster. Additionally, spectroscopic (IR, UV/Vis, Mössbauer, EPR) and electrochemical studies (CV) are presented and discussed.
Partial Anion Exchange in Ag23Te12X: The Solid Solutions Ag23Te12Cl1–xBrx, Ag23Te12Br1–yIy and Ag23Te12Cl1–zIz
Authors: Osters Oliver , Nilges Tom 
Published: January 2010

AbstractX‐ray powder diffraction, EDX and DSC measurements were performed in order to determine the structural and thermal properties of the solid solutions of Ag23Te12Cl1–xBrx, Ag23Te12Br1–yIy and Ag23Te12Cl1–zIz. A complete solid solution exists between the two ternary end members Ag23Te12Cl and Ag23Te12Br, whereas the substitution of bromine by iodine can only be observed up to y = 0.3 in Ag23Te12Br1–yIy under thermodynamically controlled synthesis conditions. Even chlorine can be partially substituted by small amounts of iodine up to a certain extend. Temperature dependent single crystal structure determinations of crystals with the nominal composition Ag23Te12Cl0.95I0.05 substantiated the significant influence of the iodine intake on the lattice parameters of the pseudo‐tetragonal orthorhombic system, especially at low temperatures. A systematic deviation from the 1:1 ratio of the a and b lattice parameter (pseudo‐tetragonal ratio) was observed upon cooling, which could not be detected in the case of the ternary compounds. X‐ray powder diffraction experiments gave a first hint on the non‐stoichiometry of this set of materials and all compounds show peritectic decomposition to binary phases at temperatures slightly above 680 K.
Synthesis, Crystal Structure, and Thermal, Magnetic and Spectroscopic Properties of New Thiocyanato Transition Metal Coordination Polymers Based on Pyrimidine as Ligand
Authors: Wriedt Mario , Näther Christian 
Published: January 2010

AbstractReaction of manganese and iron thiocyanate with pyrimidine in solution at room temperature leads to the formation of the isotypic new ligand‐rich 1:2 (1:2 = ratio between metal and ligand) compounds [Mn(NCS)2(pyrimidine)2]n (1) and [Fe(NCS)2(pyrimidine)2]n (2). Their crystal structures were determined by single crystal X‐ray analysis. The metal cations are coordinated by four pyrimidine ligands, which connect them into layers, and two terminal N‐bonded thiocyanato anions in a distorted octahedral arrangement. Investigations on their thermal behavior show that the complexes decompose quantitatively into the ligand‐deficient 1:1 compounds [Mn(NCS)2(pyrimidine)]n (3) and [Fe(NCS)2(pyrimidine)]n (4). It must be noted that they can only be prepared by thermal decomposition of their ligand‐rich 1:2 precursor compounds, whereas a synthesis in solution is not possible. In comparison with the structure of their 1:2 precursors, the thiocyanato anions become μ‐1,3 bridging, which was proved by X‐ray powder diffraction and spectroscopic investigations. Magnetic measurements of the ligand‐rich and ‐deficient compounds reveal similar behavior with an antiferromagnetic ordering at lower temperatures, which in the case of the ligand‐rich compounds must be mediated by the aromatic π‐system of the pyrimidine ligands.
Structural Transformation of Three‐Dimensional Bimetallic Phosphites Containing Corner‐Sharing 4‐Ring Chains
Authors: Lin Zhien , Nayek Hari Pada , Dehnen Stefanie 
Published: January 2010

AbstractTwo open‐framework bimetallic phosphites, [C6H18N2][Co0.3Zn2.7 (HPO3)4] (1) and [C2H8N]2[Co0.3Zn2.7(HPO3)4] (2) were synthesized and characterized. The inorganic frameworks of the two compounds are constructed from strictly alternating MO4 (M = Zn, Co)tetrahedra and HPO3 pseudo pyramids, forming three‐dimensional networks with 8‐ring and 12‐ring channels for 1 and 16‐ring channels for 2. The anionic frameworks of the two compounds can be easily transformed to a neutral framework structure with 16‐ring channels at room temperature.
One‐ and Two‐Dimensional PbII Complexes Constructed from N‐Donor Chelating Ligands with Extended π‐System and Organic Dicarboxylates
Authors: Wang Xiu‐Li , Chen Yong‐Qiang , Zhang Jin‐Xia , Liu Guo‐Cheng , Lin Hong‐Yan , Tian Ai‐Xiang 
Published: January 2010

AbstractTwo new coordination polymers [Pb(TIP)(1,3‐bdc)]n (1) and [Pb(Dpq)(fum)]n (2) (TIP = 2‐(2‐thienyl)imidazo[4,5‐f]1,10‐phenanthroline, Dpq = dipyrido[3,2‐d:2′,3′‐f]quinoxaline, 1,3‐H2bdc = benzene‐1,3‐dicarboxylic acid, fum = fumaric acid) were synthesized by hydrothermal reactions and were characterized by elemental analyses, IR spectroscopy and single‐crystal X‐ray diffraction. Complex 1 is a one‐dimensional (1D) chain, which is bridged by 1,3‐bdc ligands. This is further extended into a three‐dimensional (3D) supramolecular structure by hydrogen bonding interactions. Compound 2 exhibits a two‐dimensional (2D) network structure, which is further stacked by π–π interactions to form a 3D supramolecular framework. The most important feature of these two complexes is that the N‐donor ligands with an extended π‐system play a crucial role in the formation and stabilization of the final supramolecular frameworks. Moreover, the fluorescence property of complex 1 was also investigated in the solid state at room temperature.
One‐Dimensional and Two‐Dimensional Coordination Polymers of Copper(II) Nitrobenzoate with Bridging 3‐Pyridylmethanol Ligand
Authors: Kavalírová Jana , Vasková Zuzana , Maroszová Jaroslava , Moncol Jan , Koman Marian , Lis Tadeusz , Mazur Milan , Valigura Dušan 
Published: January 2010

AbstractComplexes of composition [Cu(X‐NO2bz)2(μ‐3PM)2]n[X‐NO2bz = 2‐nitrobenzoate (1), 3‐nitrobenzoate (2) or 4‐nitrobenzoate (3) and 3PM = 3‐pyridylmethanol] were prepared and studied by elemental analysis, UV/Vis, IR and EPR spectroscopy. The molecular structures of two new complexes 1 and 3 were solved. The copper atoms of both complexes exhibit an elongated octahedral coordination environment with the equatorial positions occupied by two monodentate nitrobenzoato anions and two 3‐pyridylmethanol nitrogen atoms in trans positions. The both axial positions are occupied by oxygen atoms of bridging 3‐pyridylmetanol ligands The polymeric structure of complex [Cu(2‐NO2bz)2(μ‐3PM)2]n (1) contains two‐dimensional layers. The complex 3 exhibits a polymeric chain‐like structure [Cu(4‐NO2bz)2(μ‐3PM)2]n with copper atoms double‐bridged by two 3‐pyridylmethanol molecules similarly as it was found for complex 2.
Reactions between Boron and Magnesium Halides and the Bicyclic Guanidine hppH (1,3,4,6,7,8‐Hexahydro‐2H‐pyrimido[1,2‐a]pyrimidine): Guanidinates with New Structural Motifs
Authors: Ciobanu Oxana , Fuchs Alexander , Reinmuth Matthias , Lebkücher Anna , Kaifer Elisabeth , Wadepohl Hubert , Himmel Hans‐Jörg 
Published: January 2010

AbstractHerein we report on the synthesis and chemical properties of some binuclear and oligonuclear compounds of boron‐ and magnesium‐containing bridging guanidinate ligands. These species were prepared by reaction of the bicyclic guanidine hppH (hppH = 1,3,4,6,7,8‐hexahydro‐2H‐pyrimido[1,2‐a]pyrimidine) and BCl3, the diborane(4) B2Cl2(NMe2)2 or the Grignard compound MeMgBr. The experimental results are complemented by quantum chemical (DFT) calculations.
Synthesis, Structure and Luminescence of Cd3Cu2 and Cd2Ni4 Heteronuclear Complexes with Macrocyclic Oxamide and 5‐Sulfosalicylicate
Authors: Sun Ya‐Qiu , Fan Lan‐Lan , Gao Dong‐Zhao , Zhang Guo‐Ying 
Published: January 2010

AbstractTwo novel heteronuclear complexes [Cd3(SSAL)2(CuL)2(H2O)4]n (1) and [Cd2(HSSAL)2(NiL)4]·4H2O (2) were synthesized and structurally determined, where SSAL is the fully deprotonated 5‐sulfosalicylic ion (CuL and NiL, H2L = 2,3‐dioxo‐5,6,14,15‐dibenzo‐1,4,8,12‐tetraazacyclopentadeca‐7,13‐diene). Compound 1 displays a 1D ladder‐like chain and all these chains are further interlinked through hydrogen bonds resulting in a 2D architecture. The structure of 2 consists of 5‐sulfosalicylates and an oxamido‐bridge and is arranged in butterfly‐like hexanuclear molecules. The luminescent properties of compounds 1 and 2 are also discussed.
Synthesis of an Unprecedented CuI Polymer with Alternate Cu(μ‐S)2Cu and Cu(μ‐Cl)2Cu Cores Bridged by Pyridine‐2‐carbaldehyde Thiosemicarbazone
Authors: Lobana Tarlok S , Khanna Sonia , Castineiras Alfonso , Hundal Geeta 
Published: January 2010

AbstractPyridine‐2‐carbaldehyde thiosemicarbazone {(C5H5N)(H)C2=N–NH–C1(=S)NH2; Hpytsc} formes an unprecedented 1D copper(I) coordination polymer, {Cu4Cl4(μ3‐S,N4‐Hpytsc)2 (PPh3)4}n (1) in which pyridyl nitrogen binds to Cu(μ‐Cl)2Cu core and sulfur bridges two CuCl units, to form alternate Cu(μ‐S)2Cu and Cu(μ‐Cl)2Cu cores in the polymer. The Cu···Cu contact in Cu(μ‐Cl)2Cu core [3.0877(6) Å] is shorter than in Cu(μ‐S)2Cu core [3.1826(6) Å].
Polytypism of Layered Alkaline Hydroxides: Crystal Structure of TlOH
Authors: Siidra Oleg I. , Britvin Sergey N. , Krivovichev Sergey V. , Depmeier Wulf 
Published: January 2010

AbstractThe crystal structure of TlOH was solved by direct methods: monoclinic, space group C121, a = 5.949(2), b = 6.220(2), c = 21.232(6) Å, β = 91.590(5)°, V = 785.3(4) Å3, R1 = 0.075 for 439 unique reflections with |Fo| ≥ 4σF. There are four symmetrically independent Tl+ cations and four oxygen atoms of OH– groups in the structure. Each of the OH– groups forms three short Tl+–O bonds thus forming OHTl3 triangles, which, in turn, share common edges to form [OH2Tl4]2+ dimeric groups. These hydroxocentered units are interconnected with each other through common corners into layers. The layers are positioned so that hydrogen bonds are formed between two OH anionic planes. The structure of TlOH is significantly more complicated than those of the AOH (A = Na, K, Rb, Cs) hydroxides. The appearance of such complexity is induced by the presence of the stereochemically active lone electron pair on the Tl+ cations. Structural distortions occur in order to minimize destabilizing interactions. The stacking sequence in layered AOH hydroxides may involve one (KOH, RbOH), two (NaOH, CsOH) and four (TlOH) layers per unit cell. This feature may be considered as a special case of chemically induced polytypism.
Three Dicyanidometallate(I)‐based Complexes Incorporating Hydrogen‐bonding, π–π Packing and d10–d10 Interactions with Auxiliary 2,2′‐Bipyridyl‐like Ligands
Authors: Guo Yang , Ma Yue , Zhou Na , Liu Zhan‐Quan , Wang Qing‐Lun , Yan Shi‐Ping , Liao Dai‐Zheng 
Published: January 2010

AbstractTo investigate the influence of the non‐covalent interactions, such as hydrogen‐bonding, π–π packing and d10–d10 interactions in the supramolecular motifs, three cyanido‐bridged heterobimetallic discrete complexes {Mn(bipy)2(H2O)[Ag(CN)2]}[Ag(CN)2] (1), {Mn(phen)2(H2O)[Au(CN)2]}2[Au(CN)2]2·4H2O (2), and {Cd(bipy)2(H2O)[Au(CN)2]}[Au(CN)2] (3) (bipy = 2,2′‐bipyridine, and phen = 1,10‐phenanthroline), which are based on dicyanidometallate(I) groups with 1:2 stoichiometry of metal ions and 2,2′‐bipyridyl‐like co‐ligands were synthesized and structurally characterized. In compound 1, hydrogen bonding and π–π interactions governed the supramolecular contacts. In compound 2, the incorporation of aurophilic, hydrogen bonding and π–π interactions result in a 3D supramolecular network. In compound 3, hydrogen bonding and π–π stacking interactions result in a 2D supramolecular layer. In the three complexes, hydrogen‐bonding, π–π packing and/or d10–d10 interactions can play important roles in increasing the dimensionality of supramolecular assemblies.
Synthese und Eigenschaften von Ph3Sn‐substituierten Telluraten – Die Kristallstrukturen von trans‐[(Ph3SnO)4Te(OH)2] und trans‐[(Ph3SnO)2Te(OMe)4]
Authors: Herntrich Tobias , Merzweiler Kurt 
Published: January 2010

AbstractThe reaction of Te(OH)6 with Ph3SnOH in ethanol leads to the formation of trans‐[(Ph3SnO)4Te(OH)2] (1). Compound 1 crystallizes triclinic in the space group P\bar{1} with a = 996.6(2) pm, b = 1365.4(3) pm, c = 1368.2(3) pm and α = 71.15(2)°, β = 71.48(2)°, γ = 74.81(3)° (at 220 K). The molecular structure of 1 consists of a tellurium atom, which is coordinated nearly octahedrally by four Ph3SnO units and two hydroxyl groups that are trans to each other. The Te–O bond lengths are in the range of 190.5(2) and 193.7(2) pm. Treatment of 1 with methanol under reflux yields trans‐[(Ph3SnO)2Te(OMe)4] (2). Compound 2 crystallizes triclinic in the space group P\bar{1} with a = 1012.8(1) pm, b = 1422.4(2) pm, c = 1618.1(2) pm, and α = 100.44(1)°, β = 107.92(1)°, γ = 110.66(1)° (at 220 K). 2 forms centrosymmetric molecules in which the tellurium atom is surrounded nearly octahedrally by four methoxy groups and two trans arranged Ph3SnO units. The Te–O bond lengths of 187.9(3)–194.5(3) pm are similar to those observed in 1.
Synthesis, Structure, and Properties of Mesoporous B/C/N Microspheres
Authors: Raidongia Kalyan , Hembram K. P. S. S. , Waghmare Umesh V. , Eswaramoorthy M. , Rao C. N. R. 
Published: January 2010

AbstractReaction of low surface area carbon with a mixture of urea and boric acid at 930 °C yields a composition close to BC4N with a graphitic structure. BC4N was characterized by electron energy loss spectroscopy, X‐ray photoelectron spectroscopy, transmission electron microscopy, Raman spectroscopy, and X‐ray diffraction. BC4N is a porous ceramic with a surface area of 428 m2·g–1, and shows a CO2 uptake of 40 wt‐%. The layered structure of BC4N involves a random distribution of boron, carbon, and nitrogen atoms and shows high thermal stability up to 1000 °C. A comparative analysis of the structure and properties of BC4N and graphene using first‐principles pseudopotential based density functional theoretical calculations is presented. The calculations predict it to be an insulator. The bulk modulus of BC4N exhibits an interesting dependence on the ordering of boron and nitrogen on the graphene lattice.
2D Metallosupramolecular Arrays of Zinc‐5,10,15,20‐tetra(4‐pyridyl)porphyrin via Self‐complementary Coordination and Peripheral Linkage
Authors: Seidel Rüdiger W. , Oppel Iris M. 
Published: January 2010

AbstractA structural study on two isotypic infinite 2D metallosupramolecular arrays of Zinc‐5,10,15,20‐tetra(4‐pyridyl)porphyrin (ZnTPyP) has been undertaken. [ZnX2(μ3‐ZnTPyP)·3TCE]n (X = Cl, Br; TCE = 1,1,2,2‐tetrachloroethane) form extended 2D grid structures driven by self‐complementary axial coordination of the metalloporphyrin entities. They both crystallize in the monoclinic system, P21/c, Z = 4, a = 19.1176(15), b = 12.931(1), c = 21.8124(18) Å, β = 103.306(8)°, V = 5247.6(7) Å3 for X = Cl and a = 19.1644(7), b = 12.9984(5), c = 21.9013(9) Å, β = 103.141(4)°, V = 5312.9(4) Å3 for X = Br.