Investigation On Crystal Growth And Properties Of Bimetallic Thiocyanate Coordination Complex Crystals

Lately, over 10 mW violet 404nm radiation has been generated by type-I single-pass frequency doubling of the output of an diode laser in critically phase-matched ZnCd(SCN)4(ZCTC) crystal. In this article, a series of bimetallic thiocyanate complexe crystals with the ABTC (the abbreviation for AB(SCN)4) and ABTL (AB(SCN)4Ln) structure type have been designed and prepared on the basis of investigation of nonlinear optical crystals. Their structures have been determined and their performances have been characterized. The regularities among the composition, structure and performace have also been discussed.The preparation, structure, performance and crystal growth method of four bimetallic thiocyanates with the ABTC structure type: ZCTC, zinc mercury thiocyanate (ZnHg(SCN)4, abbreviated as ZMTC), cadmium mercury thiocyanate (CdHg(SCN)4, abbreviated as CMTC) and manganese mercury thiocyanate (MnHg(SCN)4, abbreviated as MMTC) are investigated systematacially.The Raman spectra of the four complexes are analyzed by using group theory. The vibrational spectra of ZCTC and CMTC single crystals are studied by Raman spectroscopy and ab initio calculation with the Molecular Orbital (MO) theory using a GAUSSIAN 98 program. Agreement is achieved between the vibrational wavenumbers predicted by the theory and those observed in Raman scattering experiments. Taking ZCTC and CMTC as samples, the reasons of the high optical nonlinearities of ABTC crystals have been studied by the use of the Raman spectra and the Molecular Orbital (MO) theory. The...