磷酸钛微孔晶体的合成与结构

由于过渡金属配位环境、价态的多样性以及多种金属氧簇的形成，使过渡金属磷酸盐微孔材料得到迅速发展，特别是还原态金属的存在将提高微孔材料氧化催化性能．但是作为磷酸盐的重要成员，磷酸钛微孔晶体的发展严重滞后，采用金属钛粉为原料，控制反应速度并创造还原性氛围．利用不同有机胺为结构导向剂，合成了3种新型结构的混合价磷酸钛化合物，其中化合物1为一维链状结构，化合物2和3为具有12元环孔道结构的微孔晶体、计算表明，3种化合物中均含有三价钛，化合物2和3中存在2种钛原子，分别为3价和4价，化合物1中只有一种钛原子，价态为3．5，磁性测试显示，化合物1中钛的有效磁矩为0．867．

Synthesis and Structure of Titanophosphate Microporous Crystals

Microporous transition metal phosphates experienced dramatic development due to the diversities of coordination and valence and various aggregates of polyoxometalates. Particularly, the existence of reduced species enhanced the oxidic catalytic properties of microporous materials. However, titanophosphate microporous crystals, as an important branch of phosphates, were limited in literature up to now. Three novel mix-valent titanophosphates were synthesized by using titanium powder to control the reaction speed and create reducing environment. Various organoamines were used as trial templates. While compound 1 was a chain structure, compounds 2 and 3 were microporous crystals with 12-ring channels. Bond valence sum calculations revealed that all of these three compounds contain trivalent titanium. The oxidant states of two crystallographic unique titanium in compound 2 and 3 are 3 and 4 respectively. The state of titanium in compound 1 is 3.5, which agreed with magnetic result of effective magnetic moment of 0. 867.