Discrete M2L2 metallacycle and M2L4 cage frameworks and anion competitive reactions of Cu2L4 type receptor

摘要

Complexes [Cu2(bitmb)2Cl4] (1), [(CH3OH)(NO3) is contained in Cu2(bitmb)4](NO3)3 · CH3OH · 6 H2O (2) and [BF4 is contained in Cu2(bitmb)4](BF4)3 · 2 CH3OH · 4 H2O (3) are obtained by reaction of bitmb and Cu~(2+) salts with different anions (BF_4~-, NO_3~- or Cl~-) at different M:L ratio (1:1,1:2 or 1:2). The results reveal that complex 1 is a neutral Cu2L2 rectangle and complexes 2 and 3 are M2L4 cage-like frameworks with an anion as guest. The anion competitive reaction of the Cu2L4 type receptor with tetrahedral, triangular and spherical anions (ClO_4~-.BF_4~-.NO_3~- and Cl~-) is reported. The anion competitive experiments demonstrate that the anion selective order is ClO_4~- > BF_4~- > NO_3~- > Cl~-, and ClO_4~- is the biggest and most preferable one, so far.