Coating processes – Electrical product produced
Reexamination Certificate
2000-01-21
2001-05-01
Talbot, Brian K. (Department: 1762)
Coating processes
Electrical product produced
C427S113000
Reexamination Certificate
active
06224935
ABSTRACT:
TECHNICAL FIELD
The invention here is directed to forming highly ordered films of metallo dendrimers and transition metal complexes of bridging ligands on surfaces.
BACKGROUND OF THE INVENTION
Films of dendrimers on surfaces have been prepared by a variety of methods including self-assembly, surface confinement and spin coating. See Tsukruk, V. V., Adv. Mater. 10, 253 (1998) and references therein. For example, films of dendrimers on surfaces have been prepared by self-assembly by absorbing dendrimers with amine end-groups on various surfaces such as gold surfaces. These preparations by others have not allowed obtaining films that are sufficiently ordered so that one can obtain molecularly-resolved images of dendrimers on surfaces, so formation of dendrimer films of deliberate architecture has not heretofore been possible.
SUMMARY OF THE INVENTION
The method of the invention herein allows obtaining molecularly-resolved images of metallo dendrimers and transition metal complexes of bridging ligands on surfaces and enables forming film structures of deliberate architecture.
Said method is for forming an ordered film on a surface, i.e., on a substrate, and comprises interfacially reacting (a) dendrimer or bridging ligand functionalized for reaction with and binding to transition metal ions, dissolved in a water immiscible solvent, with (b) transition metal ions dissolved in water, on said surface.
In reactions that have been carried out, the dendrimer is poly-amido amine starburst dendrimer functionalized by pendant terpyridyl groups (8 or 32 terpyridine substituents) or the bridging ligand is 1,4-bis[4,4″-bis(1,1-dimethylethyl)-2,2′:6′,2″ terpyridine-4′-yl]benzene (BBDTB). The functionalized dendrimer or bridging ligand is dissolved in methylene chloride for (a). The transition metal ions for (b) are Fe
2+
or Co
2+
ions. The reactions were carried out on a highly ordered pyrrolytic graphite (hereinafter sometimes denoted HOPG) surface.
The term “interfacially reacting” is used herein to mean reacting at the solvent water interface. The interfacial nature of the reaction limits the reaction to two dimensions and thus enhances film formation.
The term “dendrimer” is used herein to refer to a highly branched molecule that is made in a stepwise synthesis that allows control of size and weight.
The term “bridging ligand” is used herein to refer to a molecule that has two (or more) sites, on different sides of such molecule that can bind metal centers.
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Abruna Hector D.
Bernhard Stefan
Diaz Diego
Storrier Gregory D.
Takada Kazutake
Cornell Research Foundation Inc.
Talbot Brian K.
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