  Two dimensional spectroscopy is a powerful dynamical study method that has
been developed in the last two decades. In 2D IR there are three experimental
time periods during which the system vibrational modes of interest are excited,
evolved to different frequencies and finally emit a non linear signal that is
heterodyne detected by temporal and spatial overlapping with a local
oscillator. With this approach we are able to determine vibrational coupling,
mode anharmonicities and relative orientation of transition dipole moments
which help us to obtain the structural kinetics and molecular dynamics of the
system.We can study interaction between functional groups which can be
indicators of bond formation or dissociation using 2D IR.[3] In this work we
aim to use 2D IR to compare the molecular dynamic in a monolayer interface of
an immobilized catalyst in the presence and absence of solvent. Homogenous
catalysts have the advantage of higher interaction with the reactants and thus
showing high efficiency. However, because of difficulties in separation of such
catalysts from the products and non-reusability, immobilization of homogeneous
catalysts has been considered. Although immobilization decreases the expenses
of separation and purifying the products which is especially important in
pharmaceutical industries, it does not always maintain the high activity of the
homogeneous catalysts. Solvent addition to immobilized catalysts can affect its
efficiency because of changing the molecular dynamic of the system.[4] 2D IR
approach help us to understand the structural evolution rate of such systems
through spectral diffusion analysis and vibrational relaxation lifetime.
