Extended structures of two coordination polymers based on 1,10-phenanthroline derivatives: Preparation, structural characterization and properties

• Published in: Journal of chemical sciences (Bangalore, India) India), 2016-03, Vol.128 (3), p.459-465
• Main Authors: HUANG, YAN-JU, PAN, YA-RU, DU, GANG, CAO, YI-XIN
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science
• ISSN: 0974-3626; 0973-7103
• DOI: 10.1007/s12039-016-1035-y

In this paper, we report two coordination polymers, [Cd(Medpq)(SO 4 ) (H 2 O) 2 ] n ( 1) and {[Mn(Medpq)(QUI)H 2 O] ⋅ H 2 O} n ( 2) (H 2 QUI = 2,3-pyridinedicarboxylic acid, Medpq = 2-methyldipyrido[3,2-f:2,3-h]quinoxaline) by hydrothermal processing and structural characterization by elemental analysis, thermogravimetric analysis and single-crystal X-ray diffraction. The coordination polymers 1 and 2 have 1D chains formed via coordination bonds, and unique two-dimensional supramolecular structures are further formed due to π - π stacking interactions. The results reveal that the coordination preferences of metal ions play a critical role in the framework construction of the two coordination polymers. Meanwhile, natural bond orbital (NBO) analysis was performed by the PBE0/LANL2DZ method in Gaussian 09 program. The calculated results show the obvious covalent interaction between the coordinated atoms and metal ions. Graphical Abstract Two coordination polymers were prepared by the combination of two metal salts (Cd and Mn) and 2-methyldipyrido[3,2-f:2′,3′-h]quinoxaline ligands. The coordination polymers have 1D chains formed via coordination bonds, and unique two-dimensional supramolecular structures formed due to π - π stacking interactions. The results reveal that the coordination preference of the metal ion plays a critical role in the construction of the coordination polymer.