Synthesis, Magnetic Property and Assembly Studies of Two Cu(II) Complexes Based on o-phenanthroline and Phosphate

Abstract Using newly precipitated Cu(OH)2, o-phenanthroline and phosphoric acid as raw materials, two complicated Cu(II) compounds were obtained by one-pot method. They are double-nuclear Cu(II) 1, {[Cu2(phen)2(H2PO4)3][Cu2(phen)2(H2O)(H2PO4)3]}·2H2PO4·5H2O, and mononuclear Cu(II) 2, [Cu(phen)2(H2PO4)]4·4H3PO4·2HPO4·6H2O. The crystal structure analysis showed that the copper phosphate reacted with the neutral ligand o-phenanthroline to obtain the compounds with different structures. Phosphoric acid can exist in various forms in copper complexes, such as H3PO4, (H2PO4)1-, (HPO4)2-, and form a rich and colorful supramolecular interaction with water molecules. Hirschfeld surface analysis gives the types and regions of molecular interactions in crystals. It is of scientific significance to understand the reaction between transition metal phosphate and organic neutral ligand. The thermogravimetric and magnetic properties of compounds 1 and 2 were also reported. Magnetic analysis shows that supramolecular interactions and dipole-dipole interactions have great influence on the magnetic properties of two compounds. CCDC: 20565681 for 1; 2090334 for 2.