排序方式: 共有15条查询结果,搜索用时 15 毫秒
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在水溶液中合成并培养了甘氨酸镨(或钐)配合物单晶,元素分析结果表明,化学式可用Ln(Gly)_2·Cl_3·3H_2O表示(Ln=Pr,Sm;Gly为甘氨酸)。X射线衍射测定结果,其结构式为(Pr_2Cl_2(Gly)_4(H_2O)_6]·4Cl,属单斜晶系,空间群P2_1/n,Z=2,晶胞参数为:a=1.0055(2),b=1.4619(3),c=1.0041(2)nm,β=102.09(1)°。每两个中心Pr~(3+)由两个甘氨酸羧基桥联成双核配合物。Pr~(3+)还与一个甘氨酸羧基双齿配位,再与3个O(H_2O)和一个Cl配位。Pr~(3+)的配位数为8。配位多面体由两个三角十二面体组成。 相似文献
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合成了氮杂大环配体C_9H_(22)N_4及其镍的配合物[Ni(C_9H_(22)N_4)](ClO_4)_2。用X-射线衍射方法测定了配合物的晶体结构。晶体属于正交晶系,P2_12_12_1空间群,a=13.069(8),b=14.106(7),C=9.282(4)(?),V=1711.2(?)~3,Z=4,Dc=1.72g/cm~3。配合物中镍为4配位,其配位多面体为扭曲的平面四方形。 相似文献
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分析了我国加气混凝土原料的质量特点,提出了用天然超细矿物增强加气混凝土的新思路。进行了天然超细粉石英增强加气混凝土试验研究,强度提高了50%。对增强机理进行了分析,提出超细粉石英对加气混凝土的增强机理主要为充填增强、物相增强和结构增强。 相似文献
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Franckeite and cylindrite of franckite mineral group were examined in the transmission electron microscope. Selected-area electron diffraction indicated that in the structure exists a long period, belonging to an incommensurate modulation period. The incommensurate modulation in this kind of minerals results from sine undular structure sheets. The excellent correspondence between high resolution simulated computer image and observed image was obtained on the basis of the structure of franckeite and cylindrite which was put forward in this paper. First, the fact that in the structures of franckeite and cylindrite exist two kinds of structure sheets whose lattices are different has been proved by experiment, i. e. false tetragonal symmetrical galena structure sheets(t sheets)and false hexagonal SnS_2 sheets(h sheets). The two kinds of sheets are packed in order of htht… 相似文献
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Balipholite is a new mineral discovered in China. Its space group is C cca with the lattice parameters a=13.587(6), b=20.164(10), c=5.144(1). The structure was refined to an R value of 0.047 for 949 independent reflections with (|F_0|>3σ|F_0|). Balipholite has the simailar structure as that of the carpholite group but with large cations Ba occupying the caves of the structure. It is very interesting to point out that the additional anions F and OH occupy different crystallographic positions. Formula of balipolite can he written a BaMg_2LiAl_3(Si_2O_6)_2(OH)_4F_4. 相似文献
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合成了1,4,7,10-四氮杂-环十二烷-1,4,7,10-四乙酸(H_4DOTA)配体,在水溶液中培养了Na[Ln(DOTA)·H_2O]·3H_2O(Ln=Er,Yb)配合物单晶,测定了其热谱和红外光谱,用X射线衍射方法测定了Na[Er(DOTA)·H_2O]·3H_2O的晶体结构,属正交晶系,空间群P2_12_12_1,Z=4,晶胞参数:α=1.5795(8)nm,b=1.5777(8)nm,c=0.9142(5)nm,V=2.278(3)nm~3,配合单元中铒为九配位,其配位多面体为单冠四方反棱柱体。 相似文献
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