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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 341-349 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The present paper is a trial to limit the coordination sphere and hence the coordination number of atoms in alloys. This study shows that the average weighted coordination number of binary alloys as a whole lies in between those of the component atoms. This result seems to be encouraging. The coordination numbers of different atoms in the known 26 binary alloys of vanadium are determined using two different methods, compared and discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Keywords: Coordination Polyhedra ; Nb-III B (IV B) Alloys ; Polyhedra-Packing Model ; Ta-III B (IV B) Alloys)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Niob und Tantal haben in den Legierungen mit III B- und IV B-Elementen Koordinationszahlen von 10 bis 17, die III B- und IV B-Elemente solche von 6 bis 14. In dieser Arbeit werden die Koordinationspolyeder um Nb, Ta und um die III B- und IV B-Elemente beschrieben, wobei eine neue Symbolik verwendet wird. Die Beschreibung erfolgt mit dem Polyederpackungs-Modell. Es zeigt sich, daß die meisten Strukturen mit einer oder zwei Polyedersorten aufgebaut werden können.
    Notes: Abstract Niobium and Tantalum are found to exhibit a range of coordination numbers (CN) from 10 to 17 in their alloys with group III B and IV B elements. The III B and IV B elements in these binary alloys have CN ranging from 6 to 14. The polyhedra around Nb, Ta, III b, and IV b elements have been characterized and a description of the polyhedra in terms of certain symbols is suggested. The structures of the binary alloys considered have been described in terms of polyhedra packing.Most of the structures examined up until now could be built up with one or two polyhedra, only in a few cases more than 2 polyhedra are required.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 116 (1985), S. 417-429 
    ISSN: 1434-4475
    Keywords: Coordination polyhedra ; Polyhedrapacking model ; Classification of structures ; Systematics of crystal structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Strukturen von Legierungen Können mit dem Polyederpackungsmodell beschrieben werden, dessen Gültigkeit bewiesen wurde. Wir habenalle Strukturtypen, die in den binären SystemenT 5 oderT 6 mitB 3 oderB 4 Elementen auftreten, beschrieben. Es zeigt sich, daβ die meisten Strukturen mit einer oder zwei Polyedersorten aufgebaut werden können. Eine Klassifizierung der Strukturen gemäβ ihrer Polyederpackungstypen wurde eingeführt (Tabelle 1). Zwei Typen von Polyederaufbau wurden festgestellt: entweder ein 3-dimensionales Gerüst aus einzelnen Polyedern, die Ecken, Kanten oder Flächen miteinander gemeinsam haben oder Polyederschichten. Tabelle 2 enthält die Koordinationszahlen aller Atome der behandelten Strukturtypen.
    Notes: Abstract The structures of alloys can be described in terms of polyhedrapacking. We studiedall structure types found in the binary systemsT 5 orT 6 withB 3 orB 4 (T 5: V, Nb, Ta;T 6: Cr, Mo, W;B 3: Al, Ga, In, Tl;B 4: Si, Ge, Sn, Pb) elements. Most of the structures examined until now could be built up with one or two polyhedra, only in a few cases more than two polyhedra are required. It is found that there are two types: a three-dimensional distribution of discrete polyhedra sharing corners, edges or faces and a layer-like distribution. This model proved valid for all structure types studied. Classification of the structures according to their polyhedrapacking criteria is introduced (Table 1). Table 2 includes the coordination numbers of all atoms in the studied structures.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 2391-2398 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystal Structure of a Dinuclear Peroxotitanium(IV)-Nitrilotriacetate ComplexThe structures of four peroxotitanium(IV) dipicolinates, with colours ranging from deep red to yellow orange, have been reported earlier, and a correlation between their colours and the variations of certain bond lengths has been proposed. This paper describes the pale yellow dinuclear peroxotitanium nitrilotriacetate complex Na4[Ti2O5(C6H6O6N)2]11 H2O. The monoclinic structure, space group B2/b, contains 25 independent non-hydrogen atoms and 17 hydrogen atoms. It has been determined from diffractometer data and refined to R = 3.2%. Titanium is again coordinated approximately pentagonal-bipyramidally. The μ-oxygen bridge occupies an axial position. The short (1.819 Å), nearly linear Ti-O-Ti bonds show double bond character. The titaniumperoxide bonds, however, are relatively long, thus confirming the rule proposed before: the more basic the axial ligands, the higher is the frequency of the absorption band, the longer are the Ti-peroxide bonds and the shorter are the axial distances. This is confirmed by electron density maps, which are to be discussed elsewhere in detail, showing bent Ti-peroxide bonds enclosing an angle of about 70° and a strong electron bridge on the μ-oxygen bond. Hydrogen bonding and the packing of the complexes is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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