TY - JOUR
T1 - Silavinylidene stabilized by an N-heterocyclic carbene
T2 - A theoretically predicted stable molecule
AU - Xu, Jing
AU - Ding, Yi Hong
AU - Andrada, Diego M.
AU - Frenking, Gernot
PY - 2014/7/21
Y1 - 2014/7/21
N2 - Quantum chemical calculations show that the N-heterocyclic carbene (NHC)-stabilized silavinylidene, NHCtBu→C=SiR2 is a strongly bonded complex, which has a linear arrangement of the donor and acceptor moieties. The molecule is the energetically lowest lying isomer of the NHC-stabilized R2CSi isomers and it is stable towards dimerization when R is a bulky substituent. The silavinylidene complex is the only species of the silylidene homologues NHCtBu→E=ER2 (E, E=C-Pb) which possesses a linear arrangement. The unusual bonding situation is explained in terms of donor-acceptor interactions between NHCtBu as σ donor and C=SiR2 in the doubly excited singlet state 3a 1â‡'2b2 which leads to a significantly shorter C-SiR2 bond compared with free C=SiR2. Quantum chemical calculations suggest that the N-heterocyclic carbene (NHC)-stabilized silavinylidene NHCtBu→C=SiR2 is a strongly bonded complex which, unlike all other Group 14 homologues NHC→E=ER2 (E, E=C-Pb), has a linear arrangement of the donor and acceptor moieties.
AB - Quantum chemical calculations show that the N-heterocyclic carbene (NHC)-stabilized silavinylidene, NHCtBu→C=SiR2 is a strongly bonded complex, which has a linear arrangement of the donor and acceptor moieties. The molecule is the energetically lowest lying isomer of the NHC-stabilized R2CSi isomers and it is stable towards dimerization when R is a bulky substituent. The silavinylidene complex is the only species of the silylidene homologues NHCtBu→E=ER2 (E, E=C-Pb) which possesses a linear arrangement. The unusual bonding situation is explained in terms of donor-acceptor interactions between NHCtBu as σ donor and C=SiR2 in the doubly excited singlet state 3a 1â‡'2b2 which leads to a significantly shorter C-SiR2 bond compared with free C=SiR2. Quantum chemical calculations suggest that the N-heterocyclic carbene (NHC)-stabilized silavinylidene NHCtBu→C=SiR2 is a strongly bonded complex which, unlike all other Group 14 homologues NHC→E=ER2 (E, E=C-Pb), has a linear arrangement of the donor and acceptor moieties.
KW - N-heterocyclic carbenes
KW - bonding
KW - quantum chemical calculations
KW - silavinylidene
KW - silylidene homologues
UR - http://www.scopus.com/inward/record.url?scp=84904600232&partnerID=8YFLogxK
U2 - 10.1002/chem.201403252
DO - 10.1002/chem.201403252
M3 - 文章
AN - SCOPUS:84904600232
SN - 0947-6539
VL - 20
SP - 9216
EP - 9220
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 30
ER -