Two 3D zinc-bpe frameworks constructed from 2-carboxyl/sulfo-terephthalate: Crystal structures and luminescent properties

Two new zinc(II) complexes with the formulas of [Zn(HTma)(Bpe)] (I) and [Zn_1.5(Stp) (Bpe)(H₂O)₂] (II), where H₃Tma = 1,2,4-trimellitic acid, Bpe = 1,2-bis(4-pyridyl)ethane, NaH₂Stp = monosodium 2-sulfoterephthalate, have been prepared under hydrothermal conditions. Structural syntheses show complex I is a five-fold interpenetrated three-dimensional structure based on the diamond-like networks, however, complex II is a Bpe-pillared three-dimensional framework (CIF files CCDC nos. 1404475 (I) and 140447 (II)). Thermоgravimetric analyses show that complex I possesses high thermal stability up to 325°C and the dehydrated product of complex II also begins to decompose from 357°C. The luminescent properties of the two complexes are investigated in solid state.