Tin-Based Materials in Quadratic Non-Linear Optics

The purpose of the present contribution is to focus on molecular materials. Nevertheless, it may be interesting to start this review with M2P2S6 (M is a metal in the 2+ oxidation state), which forms a family of hypodithiophosphate derivatives first described by Hahn and Klingen. These materials are built up from M cations, linked together by (P2S6) anions, and must therefore be considered as coordination 

A (3 value as large as 159 x 10 ° cm esu is observed in 4, strongly enhanced by resonance between the 532 nm second harmonic and the 421 nm absorption maximum. Nevertheless, it leads to a sizeable static (3o equal to 47.5 x 10 ° cm esu  

This compound was the first crystallographically characterized trichlorostannite salt of an amino acid. It crystallizes in the chiral 12 space group and exhibits ferroelectric behavior. Although 11 does not possess the push-pull electronic character required for large NLO efficiency, a powdered sample has provided an SHG response about 0.8 times that of urea at 1.064 qm. Although the origin of the optical 

All of them exhibit the same optical spectra, dominated by the push-pull Et2N C=N based charge transfer transition and hence have the same (3 value. In this series, a so-called degree of chirality ) has been defined as  

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