pH Dependent Synthesis of Two Manganese Compounds based on 5‐(2‐Pyrimidyl)tetrazole‐1‐acetic Acid

Abstract

Reactions of Hpymtza [Hpymtza = 5-(2-pyrimidyl)tetrazole-1-acetic acid] with MnCl 2 ·4H 2 O under different pH conditions, afforded the complexes [Mn(pymtza) 2 (H 2 O) 4 ](1) and [Mn 2 (pymtza) 2 Cl 2 (EtOH)]·H 2 O (2). The compounds were structurally characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Compound 1 shows a mononuclear structure, whereas complex 2 has a 1D chain structure. In compound 1, the 1948 pymtza ligand only acts in a monodentate manner to coordinate to one central Mn II atom by one carboxylate atom, In 2, pymtza acts as tetradentate ligand to connect three Mn II ions. Compounds 1 and 2 display 3D networks by hydrogen bonding interactions. Furthermore, the luminescence properties of Hpymtza as well as compounds 1 and 2 were investigated at room temperature in the solid state.

pH‐Directed Synthesis of Two Luminescent Zinc(II) Coordination Compounds based on 5‐Aminotetrazole‐1‐propanoic Acid

“…Tetrazole and its derivatives containing many nitrogen atoms are usually considered as excellent building blocks for the construction of coordination architectures. It is, however, sometimes difficult to obtain desired structures because the molecular architectures of supramolecular isomers are determined by a variety of factors, such as the pH value, the flexibility and rigidity of the ligand, the solvent system etc, the synthesis of which still remains a huge challenge for scientists 6–10. So far, bifunctional tetrazole‐carboxylate ligands have proven to be excellent candidates for the construction of such compounds in that they may not only tend to display various coordination modes, thereby forming fascinating coordination architectures,11–15 but also can be taken advantage of as potential explosive materials 16–20.…”

“…It is, however, sometimes difficult to obtain desired structures because the molecular architectures of supramolecular isomers are determined by a variety of factors, such as the pH value, the flexibility and rigidity of the ligand, the solvent system etc, the synthesis of which still remains a huge challenge for scientists. [6][7][8][9][10] So far, bifunctional tetrazole-carboxylate ligands have proven to be excellent candidates for the construction of such compounds in that they may not only tend to display various coordination modes, thereby forming fascinating coordination architectures, [11][12][13][14][15] but also can be taken advantage of as potential explosive materials. [16][17][18][19][20] For instance, recently, Anirban Karmakar et al reported four zinc(II) polymers and their unique catalytic activity in the Knoevenagel condensation reaction.…”