PREPARATION AND STRUCTURAL CHARACTERIZATION OF A DIMETHYLAMINE-OCCLUDING GALLOARSENATE

<正> A dirnethylamine-occluding galloarsenate,designated as GaAsO4-2,was prepared hydrothermally and determined structurally by single crystal X-ray diffraction technique. The compound crystallizes in nionoclinic space group P21/n with unit cell con-stants:a=18. 011(4),b=10. 466(4),c=19. 035(4)A ,β=113. 97(6)°,V= 3278. 81 A3,Dc =3. 06gcm-3,Z=4. The three-dimensional net of GaAsO4-2 constructed by Ga, As,O and F atoms has three kinds of open channels. One is formed by 10-T (T = Ga or As)rings packed along 010],the other two are formed by zigzag packing of 8-T rings a-long 100]and 001]. The dimethylamine molecules as templates are located inside the 10-T channels with their NH group pointing toward the channel wall.

PREPARATION AND STRUCTURAL CHARACTERIZATION OF A DIMETHYLAMINE-OCCLUDING GALLOARSENATE

A dirnethylamine-occluding galloarsenate,designated as GaAsO4-2,was prepared hydrothermally and determined structurally by single crystal X-ray diffraction technique. The compound crystallizes in nionoclinic space group P21/n with unit cell con-stants:a=18. 011(4),b=10. 466(4),c=19. 035(4)A ,β=113. 97(6)°,V= 3278. 81 A3,Dc =3. 06gcm-3,Z=4. The three-dimensional net of GaAsO4-2 constructed by Ga, As,O and F atoms has three kinds of open channels. One is formed by 10-T (T = Ga or As)rings packed along 010],the other two are formed by zigzag packing of 8-T rings a-long 100]and 001]. The dimethylamine molecules as templates are located inside the 10-T channels with their NH group pointing toward the channel wall.