Tris(2-ethylamino)amine (tren) as template for the elaboration of fluorides: synthesis and crystal structures of [(C2H4NH3)3NH]·[Zr3F16(H2O)], [(C2H4NH3)3N]2·[ZrF6]·[Zr2F12] and [(C2H4NH3)3N]·[TaF7]·F

Two tantalum fluorides templated with tren: [H4tren](TaF7)2·H2O and [H4tren](TaF7)2

“…The ''scorpion'' conformation of [H 4 tren] 4+ cations leads to characteristic N p -N t distances between primary and tertiary amine groups (Table 1): 0, 1 or 2 short distances plus 3, 2 or 1 long distances; N p -N t distances vary between 3.18 and 3.83 Å . These geometrical features were recently observed in several fluoroaluminates [7][8][9] and fluorozirconates [5].…”

“…distances (1.93-2.01 Å ). At the opposite, (3:3:1) coordination was already found in [(C 2 H 4 NH 3 ) 3 N](TaF 7 )F [5] and K 2 TaF 7 [6]; Ta-F distances are in the range 1.89-2.02 Å for I and 1.86-2.00 Å for II.…”

“…Currently, our research is focused on the synthesis of new 3D fluorides based on high valence metal cations such as Zr +IV and Ta +V . Four amine tantalates with isolated (poly)anions were previously evidenced: [NH(C 2 H 5 ) 3 ] 2 (TaOF 5 ) [2]; [N(C 2 H 5 ) 4 ] 2 (Ta 2 OF 10 ) [3]; [N(C 2 H 5 ) 4 ] 4 (Ta 4 O 6 F 12 ) [4] and [N(C 2 H 4 NH 3 ) 3 ](TaF 7 )F [5]. This paper describes the synthesis by low temperature evaporation and the structures of two new fluorotantalates obtained with tris(2-aminoethyl)amine (tren): [H 4 tren](TaF 7 ) 2 ÁH 2 O (I) and [H 4 tren](TaF 7 ) 2 (II).…”

Hydrogen bonded H3O+, H2O, HF, F− in fluoride metalates (Al, Cr, Fe, Zr, Ta) templated with tren (tris-(2-aminoethyl)amine)

“…Numerous fluorides crystallise when tren amine (tris-(2-aminoethyl)amine) reacts with metal oxides, hydroxides or fluorides and aqueous HF in solvothermal conditions at low temperature [1][2][3][4][5][6][7][8]. According to the HF aqÁ content, the amine is tri-or tetra-protonated and the corresponding [H 3 associated entities is discussed in the article, together with the thermal stability of the solids.…”

Conservation of [(C2H4NH3)3N]2·(ZrF7)2·H2O layers during the topotactic dehydration of [(C2H4NH3)3N]2·(ZrF7)2·9H2O

“…This hypothesis was based on the discovery of large (H 2 O) 17 clusters in a zinc aluminate phosphate Zn 6 In the search of fluorides with 3D open structures, tren amine was also used [2][3][4] and eventually associated with high valence cations, Zr IV+ and Ta V+ , in fluoride solutions [5].…”