Quadratic Non-Linear Optical Properties of Tin-Based Coordination Compounds

6 Quadratic Non-Linear Optical Properties of Tin-Based Coordination Compounds 

Coordination chemistry is a multi-disciplinary research area, which has led to the design of various new organic-inorganic hybrid species, with intriguing new chemical and physical behavior. These results have been boosted by the tremendous capabilities of organic synthesis, applied in the context of non-traditional electronic behavior of the metal centers. 

The present chapter will summarize the few recent investigations that have been devoted to tin-based derivatives as molecular materials with a quadratic NLO response. After a short introduction to the basic concepts of non-linear optics, and computational methods currently available, the different tin-based materials will be reviewed. 

Comprehensive introductions to the NLO properties of molecules have been reported in many reviews and textbooks, and therefore will not be presented here. Nevertheless, it may be helpful to remind the reader that the molecular NLO response is expressed from the polarization (p.) of a molecule subjected to an intense laser light  

In this expression, po is the permanent dipole moment, a the linear polarizability and (3 the quadratic hyperpolarizability (origin of the NLO behavior), E being the electric field component of the light. The 

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