Synthesis, structure, and investigation of unique magnetic properties in two novel Mn-based coordination polymers

• Published in: CrystEngComm Vol. 25; no. 48; pp. 6777 - 6785
• Main Authors: Li, Duqingcuo, Liu, Yichen, Xiang, Ruifang, Li, Yuyan, Qin, Tianrui, Dong, Xiu Yan, Sakiyama, Hiroshi, Muddassir, Mohd, Liu, Jianqiang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 11.12.2023
• Subjects: Benzene; Benzoic acid; Coordination polymers; Cryomagnetic properties; Magnetic materials; Magnetic properties; Manganese ions; Self-assembly
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d3ce01060k

Two new manganese( ii ) coordination polymers (CPs) have been synthesized using Mn(SO 4 ) 2 ·6H 2 O, 2,4-[6-(4-carboxyphenyl)pyrazin-2-yl]benzoic acid (H 2 L) and two auxiliary N-donor linkers, 1,10-phenanthroline (phen) and 1,4-bis(1 H -imidazol-1-yl)benzene (dib) to assist in the self-assembly process. The resulting compounds were identified as [Mn(L)(phen)] n ( 1 ) and {[Mn(L)(H 2 O)]·0.5dib} n ( 2 ). 1 displays a one-dimensional (1D) structure, which is further assembled to form a 2D structure through weak interactions between adjacent L 2− ligands. In contrast, 2 shows a 2D network, which can further form a 3D supramolecular network via packing interactions between the 2D networks. Focusing on the structure around manganese( ii ) ions, both 1 and 2 have bis(μ-carboxylate-κO:κO′)dimanganese( ii ) structures. The cryomagnetic behavior for 1 and 2 was complicated, suggesting the temperature-induced structural change due to the flexibility of the Mn( ii ) compounds. The unique magnetic behaviors exhibited by the two complexes also provide a new perspective for the subsequent study of magnetic materials. Two new manganese( ii ) coordination polymers (CPs) 1 and 2 were synthesized. Their magnetic properties have been studied, showing complicated cryomagnetic behavior, suggesting the temperature-induced structural change.