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Synthesis and Characterization of an Amidinate‐Stabilized cis ‐1,2‐Disilylenylethene [ cis ‐LSi{C(Ph)C(H)}SiL] and a Singlet Delocalized Biradicaloid [LSi(μ 2 ‐C 2 Ph 2 ) 2 SiL]
Author(s) -
Yeong HuiXian,
Xi HongWei,
Lim Kok Hwa,
So CheukWai
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001141
Subject(s) - delocalized electron , chemistry , toluene , singlet state , ligand (biochemistry) , triple bond , ring (chemistry) , molecule , crystallography , characterization (materials science) , stereochemistry , medicinal chemistry , double bond , polymer chemistry , nanotechnology , organic chemistry , materials science , excited state , biochemistry , physics , receptor , nuclear physics
The synthesis and characterization of novel cis ‐1,2‐disilylenylethene [ cis ‐LSi{C(Ph)C(H)}SiL] ( 2 ; L=PhC(N t Bu) 2 ) and a singlet delocalized biradicaloid [LSi(μ 2 ‐C 2 Ph 2 ) 2 SiL] ( 3 ) are described. Compound 2 was prepared by the reaction of [{PhC(N t Bu) 2 }Si:] 2 ( 1 ) with one equivalent of PhCCH in toluene. Compound 3 was synthesized by the reaction of 1 with two equivalents of PhCCPh in toluene. The results suggest that the reaction proceeds through an [LSi{C(Ph)C(Ph)}SiL] intermediate, which then reacts with another molecule of PhCCPh to form 3 . Compounds 2 and 3 have been characterized by X‐ray crystallography and NMR spectroscopy. X‐ray crystallography and DFT calculations of 3 show that the singlet biradicals are stabilized by the amidinate ligand and the delocalization within the “Si(μ 2 ‐C 2 Ph 2 ) 2 Si” six‐membered ring.