NDLI: Principles of crystal packing and intermolecular motifs for Ph3XSnXPh3, X⊕=⊕C, Si, Ge, Sn

Content Provider	Royal Society of Chemistry (RSC)
Author	Dance, Ian Ali, Basem Scudder, Marcia Craig, Don
Copyright Year	2001
Abstract	The crystallisation and crystal structure of Ph3CS3CPh31 are reported and analysed in the context of the known crystal structures of the class of compounds Ph3XSnXPh3, n⊕=⊕1–6, X⊕=⊕C, Si, Ge, Sn. The goal is to understand the crystal packing forces and patterns. A general pattern of intermolecular motifs is evident. Molecules Ph3XSnXPh3 with n⊕>⊕1 normally crystallise with sixfold phenyl embraces (6PEs) of XPh3 at both ends, forming parallel but curved strands of molecules ·Ph3XSnXPh3·6PE·Ph3XSnXPh3·6PE·. For n⊕=⊕3, 4, 5 and 6 these strands are further associated by a mixed sulfur phenyl embrace with composition S2(Ph)4, named 2S4PE. This embrace includes local interactions between phenyl groups and the lone-pair electron density of sulfur, and is calculated to have a stabilising energy within the range 4–8 kcal mol−1, compared with 10.5–13.0 kcal mol−1 for the 6PEs in these molecules. In addition to the 6PEs and 2S4PEs there are some local herringbone arrays of phenyl groups, generating efficient crystal packing. The exception to this pattern, 1, does not form 6PEs or a 2S4PE, but instead forms lateral and end-to-end motifs with less concerted multiple phenyl embraces. This set of compounds demonstrates substitutional polymorphism, that is polymorphism where the molecules are not identical but have internal iso-stereochemical substitution. Recrystallisations of 1 have not yet yielded its expected dimorph.
Starting Page	120
Ending Page	127
Page Count	8
File Format	HTM / HTML PDF
ISSN	14668033
Volume Number	3
Issue Number	28
Journal	CrystEngComm
DOI	10.1039/b103381f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polymorphism (materials science) Single-nucleotide polymorphism Phenyl group Sulfur Ge
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Materials Science

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