The TiO2, MoO3, PEO doped four-member tungstic acid sols were prepared for the first time. The stability of different doped content sols were investigated and optimized with rotational viscometer. The four-member dope...The TiO2, MoO3, PEO doped four-member tungstic acid sols were prepared for the first time. The stability of different doped content sols were investigated and optimized with rotational viscometer. The four-member doped tungstic acid sol was very stable which could be stored more than two months at room temperature. The WO3 electrochromic film prepared from this doped four- member tungstic acid sol had excellent performance and longevity of service.展开更多
The mechanism of cycloaddition reaction between singlet state H2Ge=Ge： and acetaldehyde has been investigated with the MP2/6-311＋＋G＊＊ method. From the potential energy profile, it could be predicted that the reac...The mechanism of cycloaddition reaction between singlet state H2Ge=Ge： and acetaldehyde has been investigated with the MP2/6-311＋＋G＊＊ method. From the potential energy profile, it could be predicted that the reaction has two competitive dominant reaction pathways. The reaction rule presented is that the two reactants firstly form a four-membered Ge-heterocyclic ring germylene through the [2＋2] cycloaddition reaction. As the 4p unoccupied orbital of Ge： atom in the four-membered Ge-heterocyclic ring germylene and the π orbital of acetaldehyde form a π→p donor-acceptor bond, the four-membered Ge-heterocyclic ring germylene further combines with acetaldehyde to give an intermediate. Because the Ge atom in intermediate exhibits sp3 hybridization after transition state, the intermediate isomerizes to a spiro-Ge-heterocyclic ring compound via a transition state. Simultaneously, the ring strain of the four-membered Ge-heterocyclic ring germylene makes it isomerize to a twisted four-membered ring product.展开更多
文摘The TiO2, MoO3, PEO doped four-member tungstic acid sols were prepared for the first time. The stability of different doped content sols were investigated and optimized with rotational viscometer. The four-member doped tungstic acid sol was very stable which could be stored more than two months at room temperature. The WO3 electrochromic film prepared from this doped four- member tungstic acid sol had excellent performance and longevity of service.
基金supported by the National Natural Science Foundation of China(No.51102114)
文摘The mechanism of cycloaddition reaction between singlet state H2Ge=Ge： and acetaldehyde has been investigated with the MP2/6-311＋＋G＊＊ method. From the potential energy profile, it could be predicted that the reaction has two competitive dominant reaction pathways. The reaction rule presented is that the two reactants firstly form a four-membered Ge-heterocyclic ring germylene through the [2＋2] cycloaddition reaction. As the 4p unoccupied orbital of Ge： atom in the four-membered Ge-heterocyclic ring germylene and the π orbital of acetaldehyde form a π→p donor-acceptor bond, the four-membered Ge-heterocyclic ring germylene further combines with acetaldehyde to give an intermediate. Because the Ge atom in intermediate exhibits sp3 hybridization after transition state, the intermediate isomerizes to a spiro-Ge-heterocyclic ring compound via a transition state. Simultaneously, the ring strain of the four-membered Ge-heterocyclic ring germylene makes it isomerize to a twisted four-membered ring product.
