共生晶体Mn_2Hg_4(SCN)_(12)和MnHg(SCN)_4的形成  

Comparison Study on the Crystal Structure of Symbiotic Compound Crystals Mn_2Hg_4(SCN)_(12) and MnHg(SCN)_4

作　　者：李广慧[1] 韩丽[1] 许斌 

机构地区：[1]天津商学院材料科学与工程研究所,天津300134 [2]青岛市排水管理处,青岛266071

出　　处：《人工晶体学报》2006年第1期32-35,共4页Journal of Synthetic Crystals

摘　　要：采用恒温蒸发法从水溶液中生长Hg2+、Mn2+为双配位中心的SCN-的配合物晶体。生长液中Hg2+含量较SCN-适当过量的条件下,出现Mn2Hg4(SCN)12晶体和MnHg(SCN)4晶体共生现象。MnHg(SCN)4晶体中Hg2+只与SCN-配位,Mn2+只与NCS-配位,而Mn2Hg4(SCN)12晶体中部分Hg2+可以同时与SCN-和NCS-配位体结合,并且部分SCN-同时和2个Hg2+结合成桥式结构。Mn2Hg4(SCN)12晶体中Mn2+的配位数由MnHg(SCN)4晶体中的4配位增大为5配位和6配位。Mn(NCS)46-和Mn(NCS)53-配位多面体的存在使Mn2Hg4(SCN)12晶体的颜色比MnHg(SCN)4晶体的颜色浅。The coordination complex crystals containing two coordinate centers Hg^2＋ and Mn^2＋ have been synthesized from aqueous solutions by using the constant temperature evaporation method. A new crystal of Mn2Hg4（ SCN）12, as a intergrowth crystal with MnHg（SCN）4, was obtained under the condition of excessive Hg^2＋atoms. Hg^2＋ in the crystal structure of MnHg（SCN） 4 is only coordinated by SCN^- ligands and Mn^2＋ is only coordinated by NCS- ligands, but part of Hg^2＋ in the structure of Mn2Hg4 （SCN）12 is linked by SCN^- or NCS^- ligands, and part of SCN^- is linked by two Hg^2＋ atoms, forming a bridging structure. The coordination numbers of Mn2^2＋ in Mn2Hg, （SCN）12 are changed from four in MnHg（SCN） 4 to five and six. The existence of two coordination polyhedra： Mn（ NCS）^- and Mn（NCS）^3-5 leads to the pale colour of Mn2Hg4 （SCN） 12 compared with that of MnHg（ SCN）4.

关 键 词：Mn2Hg4(SCN)12 MNHG(SCN)4 晶体生长 共生化合物 结构 

分 类 号：O78[理学—晶体学]