Ge_(10)O_(28)单元构建的两个三维锗酸盐结构:(H_3O)_4Ge_7O_(16)·3H_2O和K_4Ge_9O_(20)

(H_3O)_4Ge_7O_(16)·3H_2O and K_4Ge_9O_(20): Two Microporous Germanates Constructed by Ge_(10)O_( 28) Units

在半水溶剂热条件下 ,采用不同的合成条件合成了两个锗酸盐微孔分子筛 :(H3O) 4Ge7O16 ·3H2 O和K4 Ge9O2 0 .X射线单晶结构解析表明 ,两个晶体结构具有相同的“火箭状”二级结构单元 (SBU) ,SBU的不同的连接方式导致了完全不同的空间结构 .H4 Ge7O16 ·7H2 O的结晶学数据为Mr=894 2 7,P 43m ,a =0 7730 9( 18)nm ,V =0 462 0 5 ( 19)nm3,Z =1,MoKα ,λ =0 0 710 73nm ,R(F) =3 48% ,wR(F2 ) =8 39% .K4 Ge9O2 0 的结晶学数据为 :Mr=112 9 71,I4( 1) /a ,a =1 5 0 0 2 ( 3)nm ,c =0 7383( 2 )nm ,V =1 6618( 7)nm3,Z =4,MoKα ,R(F) =3 92 % ,wR(F2 ) =11 97% .

Quasi-solvothermal syntheses and X-ray crystal structures of two germanates (H 3O) 4Ge 7O 16·3H 2O and K 4Ge 9O 20 are presented. Although both structures are built up from the same rock-like secondary building units (SBUs) Ge 10O 28, the frameworks are different because of the different connect manners of SBUs. Crystal data for H 4Ge 7O 16·7H 2O: M r=894 27, space group P-43m, a=0 77309(18) nm, V=0 46205(19) nm 3, Z=1, Mo Kα, λ=0 071073 nm, R(F)=3 48%, wR(F 2)=8 39% for 20 parameters and 228 reflections with I>2σ(I). Crystal data for K 4Ge 9O 20: M r=1129 71, space group I4(1)/a, a=1 5002(3) nm, c=0 7383(2) nm, V=1 6618(7) nm 3, Z=4, Mo Kα, R(F)=3 92%, wR(F 2)=11 97% for 75 parameters and 922 reflections with I>2σ(I).