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Modeling intermolecular effects on nonlinear optical properties of transition-metal complexes. An effective core
T R Cundari1, H A Kurtz, T Zhou
1Computational Research on Materials Institute, Department of Chemistry, The University of Memphis, Tennessee 38152, USA.
Journal of Chemical Information and Computer Sciences
|February 24, 2001
Summary
Interacting osmium tetroxide molecules show enhanced nonlinear optical (NLO) properties. Molecular orientation significantly impacts polarizability and hyperpolarizability, revealing sensitive intermolecular effects.
Area of Science:
- Computational Chemistry
- Materials Science
- Quantum Chemistry
Background:
- Nonlinear optical (NLO) materials are crucial for advanced technologies.
- Transition-metal-oxo complexes offer tunable electronic properties.
- Understanding intermolecular interactions is key to designing novel NLO materials.
Purpose of the Study:
- To investigate the nonlinear optical (NLO) properties of interacting osmium tetroxide (OsO4) monomers.
- To explore the influence of intermolecular interactions on NLO properties.
- To determine the sensitivity of NLO properties to molecular orientation.
Main Methods:
- Utilizing effective core potential (ECP) approaches for electronic structure calculations.
- Calculating molecular polarizability (alpha) and second hyperpolarizability (gamma).
- Analyzing the effects of varying relative orientations between OsO4 monomers.
Main Results:
- Intermolecular interactions significantly enhance NLO properties in OsO4 systems.
- Polarizability (alpha) increased by up to 6% and second hyperpolarizability (gamma) by up to 100% compared to isolated monomers.
- The magnitude and sign of (hyper)polarizabilities are highly dependent on the relative orientation of the OsO4 monomers.
Conclusions:
- Weak intermolecular interactions can lead to substantial enhancements in NLO properties.
- Osmium tetroxide exhibits significant sensitivity of its NLO response to intermolecular arrangements.
- This study provides insights into designing NLO materials through controlled molecular assembly.