A Series of 1D, 2D, and 3D Coordination Polymers Based on Flexible 3‐Carboxy‐1‐Carboxymethyl‐2‐Oxidopyridinium and Different N‐Donor Ligands – Syntheses, Structures, and Luminescent Properties

Twelve new coordination polymers, namely, [Pb(L)] ( 1 ), [Mn 2 (L) 2 (H 2 O)] ( 2 ), [Mn(L)(H 2 O)] ( 3 ), [Zn 3 (L) 2 (H 2 O) 4 ] ( 4 ), [Zn(L)(pbib) 0.5 ] · 1.5H 2 O ( 5 ), [Cd(L)(pbib) 0.5 ] · 2H 2 O ( 6 ), [Zn(L)(bbtz) 0.5 ] · H 2 O ( 7 ), [Zn(L)(bbmb) 0.5 ] ( 8 ), [Co(L)(bbmb) 0.5 (H 2 O)] ( 9 ), [Zn(L)(biim‐6) 0.5 ] · 2H 2 O ( 10 ), [Cd(L)(biim‐6) 0.5 ] · 2H 2 O ( 11 ), and [Cd(L)(biim‐4) 0.5 ] · 2H 2 O ( 12 ) have been synthesized under hydrothermal conditions [H 2 L = 3‐carboxy‐1‐carboxymethyl‐2‐oxidopyridinium, pbib = 1,4‐bis(imidazol‐1‐ylmethyl)benzene, bbtz = 1,4‐bis(1 H ‐1,2,4‐triazol‐1‐ylmethyl)benzene, bbmb = 1,1′‐(1,4‐butanediyl)bis(2‐methylbenzimidazole), biim‐6 = 1,1′‐(1,6‐hexanediyl)bis(imidazole), and biim‐4 = 1,1′‐(1,4‐butanediyl)bis(imidazole)]. Compound 1 features 1D double‐chain structures, which are further linked by C–H ··· O hydrogen‐bonding interactions to form a 3D supramolecular architecture. Compounds 2 – 11 have 2D layer structures. Compound 2 possesses a 2D (4 2 · 6 4 ) layer. Compound 3 exhibits a 2D undulated 4 4 ‐squar lattice (sql) sheet. The 2D layers of 2 and 3 are further connected by intermolecular hydrogen‐bonding interactions, which lead to 3D supramolecular architectures. The structure of 4 is a 2D (3,4)‐connected net with the (4 2 · 6 2 · 8 2 )(4 2 · 6) topology. Compounds 5 – 7 have similar structures and show 2D networks with 4‐connected 4 4 ‐sql topologies. Compounds 8 and 9 have similar structures and display (3,4)‐connected networks with the (4 2 · 6)(4 2 · 6 3 · 8) topology. Compounds 10 and 11 reveal similar 4‐connected 4 4 ‐sql nets. The 2D layers of 5 – 11 are further extended into 3D supramolecular architectures through π–π interactions. Compound 12 has a 3D (6 5 · 8) CdSO 4 ‐type framework. The thermal stabilities of 1 – 12 have been studied by thermogravimetric analysis. The luminescent properties for 4 – 8 and 10 – 12 have also been investigated in detail.