Synthesis, crystal structures, magnetic properties and fluorescent emissions of two-dimensional bimetallic coordination frameworks FeII(3-fluoropyridine)2[AuI(CN)2]2 and MnII(3-fluoropyridine)2[AuI(CN)2]2

New interesting two-dimensional (2D) bi-metallic coordination polymers {FeII(3-fluoropyridine)2[AuI(CN)2]2}n (1), {MnII(3-fluoropyridine)2[AuI(CN)2]2}n (2) were synthesized and characterized by using single-crystal X-ray analysis and IR and elemental analyses. Both complexes are isostructural to each other and construct 2D {MII[AuI(CN)2]2} (M = Fe, Mn) sheet network structures, including the rhombus { M 4 II [ Au I ( CN ) 2 ] 4 }, which are called Hofmann-like structure. Both structures exhibit bilayer connections via Au–Au interactions. Complex 1 which shows two-step spin transition has been already found. However, only the structure of 1 in high-spin state (293 K) was completely solved. Therefore, in this report, the high quality of crystal data of 1 in 100% low-spin state (80 K) and 50% low-spin state (123 K) are completely solved. Also magnetic property of 2 and structure of 2 at 293 K have been studied. Furthermore, we have found that both compounds show strong fluorescent emissions in the solid state at room temperature.