摘要
合成了新化合物(NH4)6·犤Ca2(H2O)6(CH3COO)2犦·狖Ca@犤MoⅥ10MoⅤ8O52(OH)4(CH3COO)2犦狚·14H2O,并运用元素分析和单晶X衍射对其结构进行了表征.测定结果证实,该化合物由十八个钼氧八面体相互连接而成,呈现一种有趣的环状结构.在环的中心有一个Ca2+离子,它通过与环上的四个酰氧配位而与环骨架相连.有十个钼原子呈正六价,而其余八个钼原子呈正五价,且有Mo-Mo键存在.环上还有配位相连的四个乙酸配体.在环的上下各有两个Ca2+离子,它通过与该环和其它环上的氧原子配位而把环连成一维链状结构.晶体属三斜晶系,空间群P1,晶胞参数:a=1.0552(2)nm,b=1.5150(3)nm,c=1.5449(3)nm,α=60.84(3),β=88.00(3),γ=71.21(3)°,V=2.0194(7)nm3,R1=0.0366(对可观察点),wR2=0.0833(对独立点).
A new compound (NH4)6·[Ca2(H2O)6(CH3COO)2]·{Ca@[O52(OH)4(CH3COO)2]}·14H2O was prepared and the structure was determined by X ray diffraction analysis. The compound shows an interesting girdle like structure that is composed of eighteen Mo-O octahedra. There is a Ca2+cation in the center of the girdle, which connects to the girdle backbone by bonding to four oxygen atoms of the girdle. The valences of ten Mo atoms are +6 while those of the other eight Mo atoms are +5, between which Mo-Mo bonds are found. Four acetic ligands connect to the girdle. The girdles link into 1D chains by the Ca2+cations above and below the girdle bonding to the backbone oxygen atoms. This compound is triclinic, space group P1, a=1.055 2(2)nm, b=1.515 0(3)nm, c=1.544 9(3)nm, α=60.84(3), β=88.00(3), γ=71.21(3)°, V=2.019 4(7)nm3, R1=0.036 6 and wR2=0.083 3.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2002年第7期624-628,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(29871003和29733080)资助项目
关键词
合成
聚氧钼酸盐
环状结构
钛状结构
晶体结构
多酸化学
Molybdenum, Polyoxomolybdate, Girdle like structure, Chain like structure, Crystal structure
