Growth and characterization of an organometallic tri-allylthiourea complex nonlinear optical crystals

Crystal growth and comparison of vibrational and thermal properties of semi-organic nonlinear optical materials

“…From these results it was identified that UTHC had more thermal stability than UTHS. A complex formed with cadmium or mercury chlorides is more stable than the complex formed with cadmium or mercury sulfates [13]. The high melting point of semi-organic materials when compared with organic crystals arises because of the stronger bonding between the conjugation layers of thiourea molecules and metal ion [14].…”

Optical birefringence studies of thiourea complex crystals using Cauchy’s two term model by the channeled spectrum method

“…The melting point of TMS and UTMS samples are assigned at 225°C and 228°C as the temperatures corresponds to sharp peaks in DTA without corresponding weight loss in TGA. The high melting points of TMS and UTMS when compared with organic crystals arises due to the stronger bonding existing between the conjugation layers of thiourea molecules and metal ion [12,13]. In both TMC and UTMC crystals decomposition take place in three stages.…”

Synthesis, growth and characterization of an organometallic complex tri-allylthiourea cadmium bromide single crystals

“…Least-square refinement of 25 reflections was done and the structure was solved by direct method and refined by the full matrix least-square technique using the SHELXL program. It is observed from the single crystal X-ray diffraction data that the grown crystal is trigonal system with the non-centrosymmetric space group R3 c , point group C 3v and has the similar configuration of ATCC [18]. The molecule of ATCB crystal consists of Br À anion and complex cation [Cd(CH 2 @CHCH 2 NHCSNH 2 ) 3 Br] + .…”

“…The crystal is transparent and there is no absorption in the entire visible region with the cut-off wavelength at 295 nm. There is a red-shift of UV absorption edge for ATCB in comparison with ATCC or ATMC [18], this is due to less electronegativity of the bromine (Br) atom and the more distorted MXS 3 tetrahedra. But the UV cut-off is at a lower wavelength in comparison with allylthiourea complexes formed with other metal bromides [14,15].…”

“…This is beneficial to the superposition of micro-effects, resulting in the enhancement of the nonlinear effect. Effect of different metal ions on structural, thermal, spectroscopic and optical properties of ATCC [17,18], growth of ATCB [19] and growth and characterization of ATMC [18] has been reported elsewhere. In the present work, attempts were made to grow large size single crystals of ATCB by isothermal solvent evaporation as well as by conventional temperature lowering methods.…”