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3D Porous Metal Organic Framework with Coordinatively Unsaturated Zn(II) Centers: Single-Crystal-to-Single-crystal Transformation on Removal of Coordinating and Guest Molecules and Gas Sorptions

Submission Date :
3 / 8 / 2006 , 11 : 16 : 31
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Authors :
천영은, 백명현
서울대학교 화학과,
Assigned Code :
28P95포 Assigend Code Guideline
Presenting Time :
금 <발표Ⅱ>
A 3D metal-organic framework [Zn3(NTB)2(EtOH)2]n·4nEtOH (1) has been prepared by solvothermal reaction of Zn(NO3)2·6H2O and H3NTB (4,4’,4”-nitrilo-trisbenzonoic acid) in EtOH. X-ray structure of 1 indicates that 3D framework 1 is consisted of 1D Zn(II) chains formed of Zn3 cluster units, Zn3(-CO2)6(EtOH)2, which are linked by carboxylates of NTB3-. 1 retains the single crystallinity even when all coordinating EtOH as well as guest EtOH molecules were removed, which affords desolvated crystal [Zn3(NTB)2]n (1). X-ray structure of 1’ shows the change in the coordination environment around Zn(II) ions from trigonal bipyramidal to tetrahedral geometry on loss of coordinating EtOH molecules, which accompanies the change in the local geometry around NTB3- via the rotation of bridging carboxlyate plane with respect to the phenyl rings of NTB3-. Framework 1’ shows permanent porosity by adsorbing N2, H2, CO2, and CH4 gases. In particular, it stores H2 gas up to 1.2 wt% at 77 K and 1 atm.