稀土冠醚配合物的研究 ⅩⅩⅠ.单羟基冠醚与钙、稀土元素间的竞争配位及其钙配位化合物的晶体结构  

Studies on Rare Earth Coordination Compounds with Crown Ether X X I. Competitive Coordination Reaction of Monohydroxyl Crown Ether with Ca^(2+) and Ln^(3+) Ions and the Crystal Structure of Its Coordination Compound with Ca^(2+)

作　　者：季振平 程翔[1] 程功臻[1] 蔡铁军 吴成泰[1] 罗保生[2] 谌了容[2] 胡继明[2] 

机构地区：[1]武汉大学化学学院,武汉430072 [2]武汉大学分析测试中心,武汉430072

出　　处：《化学学报》1998年第6期583-588,共6页Acta Chimica Sinica

基　　金：国家自然科学基金资助课题(29701003)

摘　　要：研究了单羟基冠醚配位体6-羟基-2,3,9,10-二苯并-1,4,8,11,14-五氧杂环十六-2,9-二烯(L)对钙和镧系元素的竞争配位反应,发现该配位体在我们的实验条件下对钙的配位能力要明显大于对重稀土的配位能力;同时研究了标题大环配位体和钙的配位化合物的晶体结构,该配位化合物的分子结构式为[Ca(NO_3)(H_2O)L](NO_3),M_r=528.47,晶体属单斜晶系,α=1.5285(6),b=0.9713(3),c=1.5134(7)nm,β=98.79(3)°,V=2.2205nm^3,D_(ex)=1.531g/cm^3,D_c=1.527g/cm^3,Z=4,空间群为P2_1/c.Under the same reaction conditions, the coordination of monohydroxyl crown ether 6 - hydroxy - 2,3,9,10 - dibenzo - 1,4,8,11,14 - pentaoxa - cyclohexadeca - 2,9 - diene with Ca2+ is stronger than that of Y3+ . The results of crystal structure of the title complex are as follows: monoclinic, space group P21/c, with a = 1. 5285 (6), b = 0. 9713 (3), c = 1. 5134 (7)nm, V = 2.2205nm3,β = 98.79(3)°, Z = 4, Dex=1. 531g/cm3, Dc = 1. 527g/cm3. In the complex, eight oxygen atoms (five from crown ether ring, one from - OH, one from a water molecule and one from a monodentate nitrate anion) coordinate to Ca(II) forming an eight coordinated structural unit.

关 键 词：竞争配位 晶体结构 冠醚 镧 钙 配合物 

分 类 号：O614.231[理学—无机化学] O614.331[理学—化学]