Syntheses, structures, and photoluminescence of 1-D lanthanide coordination polymers

摘要

Five new lanthanide 1-D coordination polymers are reported which are formed from flexible salen type Schiff-base ligands H_2L and H_ 2L′ (H_2L = N,N~1-ethylene bis(salicylideneimine); H_2L′ = N,N~1-bis(3- methoxysalicylidene)ethylene-1,2-diamine). The polymeric structures are formed by bridging neutral H_2L units in the case of {[Ln_2L_ 2(CF_3SO_3)(H_2L)_4(MeOH)] ·CF_3SO_3}_n (Ln = Eu (1), Nd (2) and Er (3)), and by acetate (OAc~-) groups in [Yb_2(L)_ 2(OAc)_2(MeOH)_2]_n (4) and {[Tb_ 3(L′)_2(OAc)_5]·Et_ 2O·(MeOH)_(0.5)}_n (5). The structures of 1-5 were determined by single crystal X-ray crystallographic studies and the luminescence properties of 1 and 5 in MeOH solution were determined.