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Journal ArticleDOI

Über Germanium‐haltige Heterocyclen. III. Molekül‐ und Kristallstruktur von 5.5‐Dichlor‐1‐0xa‐4.6‐dithia‐5‐germocan

M. Dräger
- 01 Jun 1976 - 
- Vol. 423, Iss: 1, pp 53-66
TLDR
In this article, the crystal structure of the title compound 4 has been determined from single crystal X-ray data and refined to a conventional R of 0.040, and a formal classification scheme for bonding and nonbonding Ge0, GeS, Sn0, and SnS distances is given.
Abstract
Die Struktur der Titelsubstanz 4 wurde rontgenographisch aus Diffraktometer-Einkristalldaten bestimmt und bis zu einem konventionellen R von 0,040 verfeinert. Der 8-Ring besitzt Sessel-Sessel-Konformation mit transannularer 1.5-Ge…O-Annaherung. Die Koordination am Ge-Atom ist trigonal-bipyramidal mit aquatorialen Abstanden GeS 218 und GeCl 215 pm und axialen Abstanden Ge0 237 und GeCl 221 pm. Ein formales Klassifizierungsschema fur bindende und nichtbindende Ge0-, GoS-, Sn0- und SnS-Abstande wird gegeben. Relative Bindungsordnungen der transannularen Akzeptor-Donator-Wechselwirkung in 4 und analogen Heterocyclen werden diskutiert. Die Kristallstruktur von 4 ist eine OD-Struktur mit geordneten yz-Schichten und gestorter Schichtenfolge in x-Richtung. Die 4-Molekeln sind 12fach koordiniert. On Heterocyclic Systems Containing Germanium. III. Molecular and Crystal Structure of 5,5-Dichloro-l-oxa-4,G-dithia-5-germocane The crystal structure of the title compound 4 has been determined from single crystal X-ray data and refined to a conventional R of 0.040. The eight-membered ring has the chair—chair conformation with 1.5-transannular Go…O interaction. The coordination of the Ge-atom is trigonal-bipyramidal with equatorial distances GeS 218 and GeC1 215 pm and axial distances Ge0 237 and GeC1 221 pm. A formal classification scheme for bonding and nonbonding Ge0, GeS, Sn0, and SnS distances is given. Correlated bond orders for the transannular accaptordonor interaction in 4 and analogous heterocycles arc discussed. The crystal structure of 4 is an OD-structure with ordered layers of molecules parallel the yz-plane and disturbed layer sequence in the x-direction. The 4-molecules are 12-coordinated.

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Citations
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Journal ArticleDOI

Über zinn-haltige heterocyclen ☆: VII. 2,2,6-trimethyl-1,3-dithia-6-aza-2-stannocan, ein 8-ring mit transannularer Sn ⋯ N-wechselwirkung

TL;DR: The crystal structure of 2,2,6-trimethyl-1,3-dithia-6-aza-2-stannocane has been determined and refined to R = 0.043 as mentioned in this paper.
Journal ArticleDOI

Coordinative interactions in chelated complexes of silicon: XII. Mapping the expansion of coordination of silicon from 4 to 5. Crystal structure of 1,2,3,4-tetrahydro-1-trimethylsilyl-1,10-phenanthroline

TL;DR: In this paper, a model for the molecular motions of dynamic rearrangements involving an intermediate alteration of coordination number (5 → 4 a 5) at Si in chelated complexes of pentacoordinate silicon is presented.
Journal ArticleDOI

Koordinative Wechselwirkungen in Chelatkomplexen des Bors und des Siliciums, 4. Vergleich der UV-spektroskopischen Eigenschaften und der Kristallstrukturen des tetrakoordinierten 1-(Difluorboryl)- und des pentakoordinierten 1-(Trifluorsilyl)-1,2,3,4-tetrahydro-1,10-phenanthrolins

TL;DR: In this paper, an intramolekulare Koordinations bindung zwischen B bzw Si and einem Stickstoffatom with „nicht-connectenden” Elektronen is presented.
Journal ArticleDOI

Über zinn-haltige heterocyclen

TL;DR: A complete series of diphenyl and mixed methyl/chlorine/bromine/iodinephenyl substituted oxadithia- and trithiastannocanes has been prepared by reactions between the respective disodium dithiolates and tin dihalides as mentioned in this paper.
Journal ArticleDOI

The importance of the transannular secondary bonding strength in the molecular structures of metallocanes of type [X(CH2CH2Y)2MRR′] and [X(CH2CH2Y)2M′R] (M = Ge(IV), Sn(IV), Pb(IV), M′ = As(III), Sb(III) and Bi(III); X = NR″, O, S; Y = O, S)

TL;DR: The 1-oxa-4,6-dithia-, 1,3,6 trithia, 1-aza-4.6-dimitriou-dioxa-, 1-ioxa-trioxametallocane, 1.3, 6-trioxide ametallocanes, and 1.1, 6.5-trioxycarbometallocanes have a strong 1,5 transannular interaction through an acceptor atom M [Ge(IV, Sn(IV), Pb(IV).
References
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Journal ArticleDOI

X-ray scattering factors computed from numerical Hartree–Fock wave functions

TL;DR: In this paper, the Hartree-Fock wave function was used to compute X-ray scattering factors for neutral atoms from He to Lw and for most of the chemically significant ions through Lu3+ through Lu 3+.
Journal ArticleDOI

Relativistic Calculation of Anomalous Scattering Factors for X Rays

TL;DR: In this paper, relativistic calculations of the photoelectric cross section have been made and the integral for the principal contribution to Δf′ has been evaluated numerically without approximation to the form of the cross section-vs-energy curve, as has been done in previous calculations.
Book ChapterDOI

Secondary Bonding to Nonmetallic Elements

TL;DR: In this article, a qualitative explanation of the secondary bond behavior is given, and it is argued that the secondary bonds are the result of directed forces rather than electrostatic or non-nondirectional van der Waals forces.
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