Cr (5) complex synthesis in deuterated ethanediol and propanediol for the target with polarized deuterons

For development of material for the target with polarized deuterons, the chromium complex with deuterated ethanediol and propanediol ligands was synthesized. The kinetics and flow regime of the oxidation reaction of diols with dichromates, necessary for preparation of the complex is presented. The method of the synthesis of the Cr complex in deuterated ethanediol C2D4(OD)2 is briefly described. The 40+-2% deuteron polarization was achieved in the 60 cm3 target at 0.2 K in the field of 2.1 T with the help of the Cr complex in completely deuterated ethanediol. This polarization, reached by dynamic method, can be conserved by freezing it at 0.02 K and 0.45 T.It is the first ''frozen''type polarized deuteron target.Synthesis of Cr complex in deuterated propanediol-1.2 C3D6(OD)2 is described in detail. The characteristic features of this substance is a higher deuterium content and better ratio of the number of polarized nucleus to the total number of nucleons, than in ethanediol. Thus, it seems to be an attractve material for a ''frozen'' target. A review of the achievements of various laboratories in developing the material for a dynamically polarized target on the basis of irradiated ammonia is reported