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Donor‐Stabilized 1,3‐Disila‐2,4‐diazacyclobutadiene with a Nonbonded Si⋅⋅⋅Si Distance Compressed to a Si=Si Double Bond Length
Author(s) -
Gau David,
Nougué Raphael,
SaffonMerceron Nathalie,
Baceiredo Antoine,
De Cózar Abel,
Cossío Fernando P.,
Hashizume Daisuke,
Kato Tsuyoshi
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201608416
Subject(s) - van der waals force , silicon , bond length , coulomb , crystallography , ring (chemistry) , molecular geometry , chemistry , double bond , space (punctuation) , nitrogen , molecular physics , chemical physics , materials science , atomic physics , molecule , physics , crystal structure , polymer chemistry , quantum mechanics , electron , organic chemistry , linguistics , philosophy
A donor‐stabilized 1,3‐disila‐2,4‐diazacyclobutadiene presents an exceptionally short nonbonded Si⋅⋅⋅Si distance (2.23 Å), which is as short as that of Si=Si bonds (2.15–2.23 Å). Theoretical investigations indicate that there is no bond between the two silicon atoms, and that the unusual geometry can be related to a significant coulomb repulsion between the two ring nitrogen atoms. This chemical pressure phenomenon could provide an alternative and superior way of squeezing out van der Waals space in highly strained structures, as compared to the classical physical methods.