title: Investigation of catalytic characterization of two-dimensional molecular space with regular ammonium and pyridine groups.
abstract: Novel two-dimensional molecular space with regular pyridine groups layered pyridine-4-amidepropylsilica (PAPS) and pyridine-4-amidephenylsilica (PAPhS) were successfully synthesized through grafting pyridine groups in the layer structure of two-dimensional molecular space with regular ammonium groups layered aminopropylsilica (ATMS-DS) and layered aminophenylsilica (APhTMS-DS). The two-dimensional structures were kept after grafting reaction of pyridine groups in PAPS and PAPhS. The catalytic potentials of two-dimensional molecular space with regular ammonium and pyridine groups were investigated. The catalytic capability of APhTMS-DS, PAPS, and PAPhS was confirmed through Knoevenagel condensation reactions. Knoevenagel condensation of aromatic aldehydes with malononitrile was not observed in the presence of ATMS-DS. Otherwise, the lower yield of Knoevenagel condensation of higher active 2-chlorobenzaldehyde with malononitrile in the presence of APhTMS-DS, PAPS, and PAPhS indicated the potential of the two-dimensional molecular space with regular catalyst molecules on influencing catalysis processes utilizing the chemical and geometrical limits.
authors.affiliation: Department of Chemistry, Shanghai University, Shanghai 200444, PR China.
authors.forename: Jianming
authors.initials: J
authors.lastname: Chen
authors.forename: Ken
authors.initials: K
authors.lastname: Yao
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Shangguan
authors.forename: Jian
authors.initials: J
authors.lastname: Yuan