ABSTRACT
Molecules are the smallest entities that can have some function.
Therefore, the smallest possible devices may consist of molecules,
in which each individual molecule works as a functional unit
[1, 2]. Molecules must be organized into well-defined architectures
by means of directional intermolecular interactions, that is, non-
covalent bonds, for cooperative performance [3]. Communication
among functional units, i.e., molecules, may be achieved on the basis
of electron-and energy-transfer processes. Therefore, properties of
intermolecular bonds should be clarified as conduits for electronic
communication. Further, switching functions for these processes
must be installed as mechanisms for logic operation [4]. Switch-
ing may be effected by external stimuli, such as photons, electrons,
protons, etc. Porphyrins are very attractive building blocks for such
molecule-based devices due to its excellent electronic and photonic
properties and their amenability to synthetic modification to afford
well-defined elaborate structures [5-7].
