Recentty,orqarnaetatlic couptex crystals have attracted peoples in the exploration of new
nonlinear optical and uLtifunctionat aateriats.This is because of their wide transparent ranqe:
, Large nonlinear optical susceptibiLities, stable chemicaL and good sechanicat properties.
Followinq the double group structure aodeL1,we have found and qrn a series of organometatlic
complex crystals----BTCC2,TSCCC3,ATCC4.After AItC,we have discovered and grown several new
crystats--Altylthiourea Cadiii(Mercury) Ihtoride or Bro.ideM[QI21HO12MItH,} 3X2, M= Cd,
Hg;xCl,Br.Their poier SHG efficiencies are all largerthan that of IJrea.This paper sainty
reports the growth. structure and properties of Tri-Allyithiourea Cadaii Bromide(ATtB)