Effect of Charge on the Structures of Zn(II) Coordination Polymers with Triazole-carboxylate Ligands: Syntheses, Structures, and Luminescent Properties

Abstract

Three new Zn(II) coordination polymers, {[Zn(L1)2(H2O)2]·4H2O}n (1), {[Zn(L2)(H2O)2]·0.5H2O}n (2), and {[Zn1.5(L1)(o-bdc)(H2O)]·0.5H2O}n (3) (HL1 = 3,5-di(1,2,4-triazol-1-yl)benzoic acid, H2L2 = 5-(triazol-1-yl)isophthalic acid, o-H2bdc = 1,2-benzenedicarboxylic acid), were successfully synthesized and characterized. Compound 1 exhibits 1D chain structure containing [Zn(L1)2] unit. Compound 2 shows a 2D plane with the ratio of Zn:L2 was 1:1 since L2 can match the positive charge of Zn(II). When L1 and o-bdc2– were presented together, Zn(II) centers are linked by L1 to form 2D double layers, then o-bdc2– further connected the adjacent layers to generate final 3D framework of 3. The ligand charges may play key roles in tuning the frameworks of compounds 1–3. The solid state luminescence of compounds 1–3 and all ligands have been investigated here.

Structural Diversities of a Series of Cd(II) Coordination Complexes Based on a Flexible Tripodal N-donor Ligand

“…The emission bands of 3 present red shifts (62 nm) in contrast to those of the free carboxylate ligands (m-H 2 phda). In view of similar excitation wavelengths for the complex and carboxylate ligands, the coordination of ligands with the Cd(II) ions can improve the conjugation degree of ligands, which may cause the red-shifts [31]. The different photoluminescent behaviors of 1-3 with the same metal center and N-donor ligand may be caused by the coordination environment, auxiliary aromatic polycarboxylate ligand.…”

Structural Insights into Influence of Isomerism on Properties of Open Shell Cobalt Coordination System

“…Recently, extensive attention has been focused on the coordination chemistry of transition metals carboxylates, especially with N-donor ligands [1,2,3,4]. Coordination compounds belonging to this group are especially interesting because of their useful properties and wide applications (e.g., in wood preservation, as photoluminescent materials, in thermoelectric devices and magnetic materials) originating from their specific crystal structures [1,5,6]. Due to possessing various coordination modes, the carboxylate anions have been used for the synthesis of compounds with diverse structures and topologies.…”

Selective and Recyclable Sensing of Aqueous Phase 2,4,6-Trinitrophenol (TNP) Based on Cd(II) Coordination Polymer with Zwitterionic Ligand

“…Since the end of the 20th century, considerable attention has been paid to synthesis and characterization of novel coordination polymers (CPs) as well as metal-organic framework (MOFs) with fascinating structures and diverse functions [1][2][3][4][5][6][7][8]. An important feature is that the choice of appropriate ligands plays a very crucial role in the construction of CPs with specific structures, which promoted chemists to design new ligands and study their coordination chemistry [9].…”