Synthesis, structures and luminescent studies of five metal coordination compounds with a pyridine-containing tripodal ligand

Synthesis and Structures of Four Metal‐Organic Coordination Compounds with Isomeric Tripodal Ligands

“…Therefore, in comparison to cyclic hexanuclear structure 3 , coordination compound 4 shows distinct 1D zigzag chain structure, implying chloride anions have significant effect on the structures of the coordination compounds. In addition, our previous investigations showed that when free ligand L3 was used to react with CuCl 2 · 2H 2 O instead of Cu(NO 3 ) 2 · 3H 2 O, 1D zigzag chain [Cu(L3)(Cl)](Cl) · 2H 2 O was obtained, in which chloride anions not only take part in the coordination with Cu II atoms, but also play important roles as couteranions to balance the electronic neutrality of the crystals . The results further proves that the existence of different anions have great influence on the assembly of coordination compounds.…”

“…Noticeably, coordination compound 2 and our lately reported [Cu(L3)(Cl)](Cl) · 2H 2 O could be synthesized with the same metal salts CuCl 2 · 2H 2 O except different ligands L3 and L4 . However, they exhibit various 1D zigzag chain structures, and the former contains two kinds of Cu II atoms with different coordination environments, while the latter has only one kind of Cu II atoms, which further indicates that isomeric tripodal ligands have great influence on the formation of coordination compounds.…”

“…As mentioned above, coordination compound 1 exhibits stable mononuclear structure while the pyridine atoms remain uncoordinated similar to reported coordination compound [Ni(L3) 2 ](ClO 4 ) 2 , but the space groups, chemical compositions, and the 3D packing modes are different. Meanwhile, coordination compound 2 and [Cu(L3)(Cl)](Cl) · 2H 2 O show various 1D zigzag chain structures with different kinds of Cu II coordination geometries , . The above results indicate that isomeric tripodal ligands have major influence on the formation of coordination compounds.…”

“…The above results indicate that isomeric tripodal ligands have major influence on the formation of coordination compounds. In addition, coordination compound 1 and reported [Cu 2 (L4) 2 (Cl)](ClO 4 ) 3 · 2H 2 O were synthesized with the same L4 · 3HCl ligand except different metal ions, and the latter forms 1D ladder structure, indicating that metal cations have remarkable influence on the formation of coordination compounds , . Interestingly, coordination compounds 3 and 4 were synthesized with the same tripodal ligand L3 and metal salt Cu(NO 3 ) 2 · 3H 2 O except chloride anions, however, one possesses cyclic hexanuclear structure while the other displays 1D zigzag chain structure.…”

“…In the construction of new supramolecular coordination compounds, tripodal ligands are of special interest since they have three functional pendants and variable coordination sites . Recently, we focus our attention on diazole‐containing or pyridine‐containing tripodal ligands, and have acquired diverse coordination compounds from mononuclear, dinuclear, tetranuclear, to polynuclear one‐dimensional (1D) zigzag chain structures . As an extension of our previous work, we herein reported four new coordination compounds with two isomeric ligands L3 and L4, i.e., mononuclear [Ni(L4) 2 ](ClO 4 ) 2 · 2H 2 O ( 1 ), 1D zigzag chain [Cu 2 (L4) 2 (H 2 O) 2 (Cl)](Cl) 3 · 5H 2 O ( 2 ), cyclic hexanuclear [Cu 2 (L3) 2 (H 2 O)(Cl)](Cl) 2 · (NO 3 ) · 6H 2 O ( 3 ), and 1D zigzag chain [Cu(L3)(H 2 O)(NO 3 )](NO 3 ) · H 2 O ( 4 ) (Scheme ).…”