Synthesis, crystal structure, Hirshfeld surface analysis, and fluorescent sensing for Fe3+of an Mn complex based on 1⁃naphthalic acid

Under hydrothermal conditions, a manganese complex [Mn(na)2(Dmbpy)(H2O)]<middle dot>Hna (1) was synthesized by using manganese sulfate, 1 & hybull;naphthoic acid (Hna), and 4,4'& hybull;dimethyl & hybull;2,2'& hybull;bipyridine (Dmbpy), and characterized by elemental analysis, single crystal X & hybull; ray diffraction, powder X & hybull; ray diffraction, infrared spectrum, Hirshfeld surface analysis, and thermogravimetric analysis. The single & hybull;crystal X & hybull;ray diffraction result shows that 1 belongs to the triclinic crystal system, P1 space group, and the central metal Mn(II) is located in a six & hybull;coordinated, distorted trigonal prism configuration. The 2D supramolecular network structure is formed by intermolecular C/O-H...O, C-H... 7r, and 7r ... 7r interactions. CrystalExplorer was used to analyze the Hirshfeld surface of 1. The 2D finger & hybull; print of 1 shows that the H...H interaction plays a significant role in maintaining structural stability. Powder X & hybull;ray diffraction analysis shows that the synthesized 1 is in pure phase. Thermogravimetric analysis shows that 1 has good thermal stability. The solid & hybull;state fluorescence spectrum showed that 1 had a maximum emission wavelength of 423 nm at an excitation wavelength of 347 nm. In the fluorescence sensing experiment, 1 showed selective recognition ability to Fe3+ with a detection limit of 0.52 mu mol<middle dot>L-1. In addition, the mechanism analysis shows that the fluores & hybull; cence quenching of 1 may be due to the energy & hybull;competitive absorption between Fe3+ and 1. CCDC: 2400837.