Quantitative Study on the Templating Effect in the Formation of ZSM-5 Molecular Sieve

Since the discovery of ZSM-5 molecular sieves as a promising catalyst material, the synthesis of ZSM-5 has been investigated in great detail. In the first synthesis of ZSM-5,tetrapropylammonium(TPA) was used as the templating agent. However, the industrial manufacture and application of ZSM-5 molecular sieves arc limited because TPA, the templating agent, is expensive. In the attempt to search for a suitable substitute for TPA,

Microwave-assisted fast and efficient synthesis of some crown ethers

13-Crown-4, 16-crown-5, dibenzo-12-crown-4 and dibenzo-14-crown-4 were synthesized by a one-pot microwave-assisted procedure in good yields. Irradiation of diols and dichlorides in the presence of sodium hydroxide in DMSO gave title crown ethers presumably within a template effect. ？2009 Hossein Eshghi. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All fights reserved.

Structure-directing Effect on Synthesis of Layered Aluminophosphates with Same Topology

Three layered aluminophosphates（UiO-15, APDAP12-150 and APDAP-150） with same topology were crystallized from an initial mixture with a molar Composition of A1203：1.SP2Os：5.5R：227HzO, where R is ethylene- diamine, 1,2-diaminopropane or 1,3-diaminopropane, respectively. The crystallization processes of UiO-15, APDAPI2-150 and APDAP-150 were investigated using solid-state NMR in combination with XRD and other cha- racterization techniques. The evolution of the coordination states of Al and P in the solid products was monitored, and the possible starting points of crystallization（core units） of UiO-15, APDAP12-150 and APDAP-150 were obtained and analyzed. The formation ofa trimer as well as a hexamer of aluminophosphate, a monomer of PO4 and a nonamer containing two three-membered rings is critical for the start of crystallization of UiO-15. The formation of a hexamer and a pentamer is critical for the start of crystallization of APDAP12-150. The formation of an A106 monomer and a pentamer containing a three-membered ring is critical for the start of crystallization ofAPDAP-150. The crystal water played a co-structure-directing role in the formation ofAPDAP-150.

Template-directed synthesis of pyridazine-containing tetracationic cyclophane for construction of[2]rotaxane

Benefiting from its bent molecular structure,3,6-pyridazinyl contained tetracationic cyclophane（1） is synthesized by template-directed method with high isolated yield up to 92%.This template-directed strategy is further utilized to efficiently construct [2]rotaxane.