Affiliation:
1. Department of Chemistry, University of Auckland, Private Bag 92019 Auckland, New Zealand
Abstract
Adsorption interactions of the bidentate molecules 2,2'-bipyridine and 4,4'-bipyridine with the surfaces of different alumina-pillar interlayered clays have been investigated by FT-IR spectroscopy. These interactions were examined in an attempt to establish a spectroscopic method for the determination of interpillar distances in the galleries of pillared clays. 2,2'-Bipyridine adsorbs in a bidentate C2 v, interaction to single Lewis acid sites on the surfaces of individual pillars and not to adjacent pillars, indicating that the distances between binding sites on adjacent pillars are too great to be successfully probed by this molecule. 4,4'-Bipyridine maintains the D2 h symmetry of the free molecule through interaction with Lewis acid sites on two adjacent pillars simultaneously via both ends of the molecule, thereby exhibiting possible utility as a probe of the interpillar distance. Surface-adsorbed monoprotonated 2,2'-bipyridinium cations are formed through interaction with Brönsted acid sites on the pillared clay surfaces. The IR spectrum of the surface-adsorbed protonated species suggests C2/i transoid symmetry and is presented for the first time.
Subject
Spectroscopy,Instrumentation
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献