Direct Observation of Molecular-Level Template Action Leading to Self-Assembly of a Porous Framework

作者：Bajpe Sneha R^*; Kirschhock Christine E A; Aerts Alexander; Breynaert Eric; Absillis Gregory; Parac Vogt Tatjana N; Giebeler Lars; Martens Johan A

来源：Chemistry - A European Journal, 2010, 16(13): 3926-3932.

DOI：10.1002/chem.200903239

• keggin heteropolyacids
• NMR spectroscopy
• polyoxometalates
• metal-organic frameworks
• template synthesis

The molecular steps involved in the self-assembly of Cu(3)(BTC)(2) (BTC = 1,3,5-benzenetricarboxylic acid) metal organic frameworks that enclose Keggin-type H(3)PW(12)O(40) heteropolyacid molecules were unraveled by using solution (17)O, (31)P, and (183)W NMR spectroscopy, small-angle X-ray scattering, near-IR spectroscopy, and dynamic light scattering. In aqueous solution, complexation of Cu(2+) ions with Keggin-type heteropolyacids was observed. Cu(2+) ions are arranged around the Keggin structure so that linking through benzenetricarboxylate groups results in the formation of the Cu(3)(BTC)(2) MOF structure HKUST-1. This is a unique instance in which a templating mechanism that relies on specific molecular-level matching and leads to explicit nanoscale building units can be observed in situ during formation of the synthetic nanoporous material.

• 出版日期2010