Supramolecular assembly at interfaces: formation of an extended two-dimensional coordinate covalent square grid network at the air-water interface

Jeffrey T Culp; Ju-Hyun Park; Diktys Stratakis; Mark W Meisel; Daniel R Talham

doi:10.1021/ja026312e

Supramolecular assembly at interfaces: formation of an extended two-dimensional coordinate covalent square grid network at the air-water interface

J Am Chem Soc. 2002 Aug 28;124(34):10083-90. doi: 10.1021/ja026312e.

Authors

Jeffrey T Culp¹, Ju-Hyun Park, Diktys Stratakis, Mark W Meisel, Daniel R Talham

Affiliation

¹ Department of Chemistry, University of Florida, Gainesville 32611-7200, USA.

PMID: 12188672
DOI: 10.1021/ja026312e

Abstract

Reaction of a Langmuir monolayer of an amphiphilic pentacyanoferrate(3+) complex with Ni(2+) ions from the subphase results in the formation of a two-dimensional iron-nickel cyanide-bridged network at the air-water interface. The network can be transferred to various supports to form monolayer or multilayer lamellar films by the Langmuir-Blodgett (LB) technique. The same network does not form from homogeneous reaction conditions. Therefore, the results demonstrate the potential utility of an interface as a structure director in the assembly of low dimensional coordinate covalent network solids. Characterization of the LB film extended networks by X-ray photoelectron spectroscopy (XPS), FT-IR spectroscopy, SQUID magnetometry, X-ray absorption fine structure (XAFS), and grazing incidence synchrotron X-ray diffraction (GIXD) revealed a face-centered square grid structure with an average domain size of 3600 A(2). Magnetic measurements indicated that the network undergoes a transition to a ferromagnetic state below a T(c) of 8 K.