Metal Complexes as -Conjugated Bridges

METAL-BASED QUADRATIC NONLINEAR OPTICAL MATERIALS 

Such a type of donor-acceptor complex represents an original class of 2D dipolar NLO chromophore, and EFISH and HRS experiments in combination with INDO/singles configuration interaction(SCI)-SOS theoretical calculations have been used to investigate the 2D character of the [3 response in 62 (A = C1) the 2D optical nonlinearity is related to the existence of various low-energy charge transfer states, and while 

deduced from electroabsorption (Stark) data, was reported to be lower, although still high (/3i.o6 = 1710 x 10 ° esu). By working with a nonresonant wavelength of 1.91 /xm, the / i.9i value was found to be again much lower (/ i.9i = 540 x 10 ° esu). Finally, a similar lower value of quadratic hyperpolarisability / i.9i(EFISH) has been reported for the Ni compound 70 (/3i.9i = 80-100 x 10 ° esu).  

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