Influence of F- on the Structure-directing Effect of Organic Amines in the Synthesis of Open-framework Aluminophosphates

The significant influence of F-on the structure-directing effect of ethylenediamine( en) and diethylenetriamine( deta) in the synthesis of open-framework aluminophosphates was investigated. For the system with ethylenediamine,in the absence of F-,layered aluminophosphate Al2P2O9·NH3( CH2)2NH3( Ui O-13)was obtained from the initial mixture with n( Al2O3) ∶ n( P2O5) ∶ n( en) ∶ n( H2O) = 1. 0 ∶ 1. 5 ∶ 18. 0 ∶ 147 under hydrothermal condition,while layered aluminophosphate Al F( HPO4) ·NH2( CH2)2NH2( 1) was obtained from the initial mixture with n( Al2O3) ∶ n( P2O5) ∶ n( en) ∶ n( HF) ∶ n( H2O) = 1. 0 ∶ 1. 5 ∶ 18. 0 ∶ 3. 0 ∶ 147.The results suggested that the F-significantly affected the structure-directing effect of ethylenediamine. For the system with diethylenetriamine, a three-dimensional( 3D) open-framework aluminophosphate Al4P5O20( H2O)2·C4N3H16( Al PO-CJ31) was synthesized from the initial mixture with n( Al2O3) ∶ n( P2O5)∶ n( deta) ∶ n( H2O) = 1. 0 ∶ 4. 0 ∶ 3. 0 ∶ 153 under hydrothermal condition,while a one-dimensional( 1D) aluminophosphate Al2P4O10( OH)3F·C4N3H15( 2) was crystallized from the similar initial mixture in the presence of F-[n( Al2O3) ∶ n( P2O5) ∶ n( deta) ∶ n( HF) ∶ n( H2O) = 1. 0 ∶ 4. 0 ∶ 3. 0 ∶ 3. 0 ∶ 153]. The results indicated that the structure-directing effect of diethylenetriamine was significantly altered by F-. The structural properties of open-framework aluminophosphates Ui O-13,1,Al PO-CJ31 and 2 were analyzed in detail and the influence of F-on the structure-directing effect of ethylenediamine and diethylenetriamine was discussed.