Synthesis and Characterization of Three New Zipper‐like Lanthanide [Ln = TmIII, NdIII, CeIII] Coordination Polymers Containing 1,3‐Benzenedicarboxylate and 2‐Phenyl‐1H‐1,3,7,8‐tetraazacyclopenta[l]phenanthrene Ligands

Abstract

AbstractReaction of the ligands 2‐phenyl‐1H‐1,3,7,8‐tetraazacyclopenta[l]phenanthrene (PTCP) and benzene‐1,3‐dicarboxylic acid (m‐H2BDC) with Ln2O3 under hydrothermal conditions lead to three isomorphous coordination polymers [Ln2(PTCP)2(m‐BDC)3·H2O]n (Ln = Tm, 1; Nd, 2; Ce, 3). The coordination polymers crystallize in monoclinic, space group P21/m with a = 9.8340(2), b = 17.9140(4), c = 15.6050(3) Å, β = 100.51(3)° for 1, with a = 9.8423(3), b = 18.3562(4), c = 15.6209(3) Å, β = 102.138(3)° for 2, and with a = 9.8620(2), b = 18.4960(4), c = 15.6530(3) Å, β = 102.42(3)° for 3, respectively. The metal ions (Ln3+) are located in an octacoordinated environment and the dinuclear [Ln2O12N4] units act as octahedral secondary building units (SBU), which are bridged in two coordination modes by six m‐BDC ligands to form a three‐strand‐like chain. These chains are decorated by PTCP ligands and form unique three zipper‐like structures, which are further assembled into three‐dimensional supramolecular nets by π···π stacking interactions. Additionally, hydrogen bonds are observed in the structures. Furthermore, compounds 1–3 were studied by IR spectrocopy and thermogravimetric analyses.