合成了三氰酸阴离子和硼酸为主体晶格的正四丁基铵阳离子包合物(n-C4H9)4N+·C3H2N3O-3·H3BO3,并通过单晶X射线衍射法对其进行了晶体结构测定.结果表明:晶体属三斜晶系,空间群为P-1(No.2),a=0.97399(16)nm,6—1.02315(17)nrn,c=1.2932(2)nm,d=101.269(3)°,β=92.071(3)°,γ=98.155(3)°,Z=2,V=1.2484(4)nm3,Dc=1.150g·cm-3,μ(MoKa)=0.084nm-1,F(000)=472,对5010个独立衍射点的最终偏离因子R1—0.0558.在标题化合物的晶体结构中,对称中心相连的三氰酸阴离子之间通过1对N—H…O氢键相连,形成沿b轴无限延伸的锯齿形长链.2个硼酸分子由1对O-H…O氢键连接,形成中心对称的二聚体.硼酸二聚体向外的2个羟基分别与邻近的三氰酸阴离子氢键长链通过O-H…O和O-H…N氢键连接,在(101)平面内形成无限伸展的波形氢键平面网格.四丁基铵阳离子穿插在氢键平面之间,形成类“三明治”式层状包合物.
A new inclusion complex, (n-C4H9)4N+-CaH2N3O-3 ·H3BO3, is prepared and characterized by X-ray crystallography. Crystal data: triclinic, space group P-1(No. 2), a=0. 973 99(16) nm, bhl. 023 15(17) nm, c=1. 293 2(2) nm, a=101. 269(3)°, β=92. 071(3)°, Y=98. 155(3)°, Z=2, V=1. 2484(4) nma, Dc= 1. 150 g·cm-3, μ(MoKo)=0. 084 mm-1 , F(000)=472, and R1 =0. 055 8 for 5 010 independent reflections. In the crystal, structure of the title compound, two cyanuric anions related by symmetric center are linked by a pair of N--H…O hydrogen bonds to form a zigzag ribbon parallel to the b axis. Two boric acids related by symmetric center form a dimer by a pair of O--H…O hydrogen bonds. Further hydrogen bonds between boric acid dimer and cyanurie anions of adjacent ribbons are formed and two-dimensional puckered layer parallel to the (101) family of planes is thus formed. The complex features a sandwich-like structure in which the tetra-n- butylammonium cations occupy the space between cyanuric anions-boric acid layers.