在单晶X射线衍射实验的基础上,对孔道结构化合物V9P8-en的类质同象物V9(P,B)8-en的晶体结构和晶体化学进行了深入研究.结果表明,该化合物的晶体学数据为:P2(1)/n,a=1.43134(9)nm,b=1.01256(6)nm,c=1.83156(12)nm,β=90.280(2)°,V=2.6545(3)nm3,Z=2,R=0.0540,wR2=0.1551.结构中,沿着三个结晶轴方向发育复杂而规整的三维孔道,最大孔径达1.83nm(∥b轴),质子化乙二胺和水分子居于孔道中.硼部分替代四面体配位的磷,替代率为B8:P8=0.1838:7.8162;其中B与{P-OH}位P的替代量大于与[P-O]位P的替代量.相对于V9P8-en来说,V9(P,B)8-en的晶胞参数发生了变化,导致b轴增长(1.0150→1.0256nm)和c轴缩短(1.8374→1.8316nm),同时β角变小(90.39→90.278(2)°).二者的化学计量比也不同,体现在结构与孔容的关系、电荷平衡、满足亲水-疏水作用的结晶水的数量及有机模板分子的赋存状态等方面都有差异.
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