Synthesis, crystal structure and fluorescent properties of two metal-organic frameworks constructed from Cd(II) and 2,6-naphthalene dicarboxylic acid

Aimed at exploring the effect of reaction conditions on the formation of crystal structures of metal-organic framework materials (MOFs), two new MOFs [Cd3(2,6-NDC)3(DMF)4(NO3)] (1) and [Cd2(2,6-NDC)2(DMF)2] (2), have been prepared using Cd(II) and 2,6-naphthalene dicarboxylic acid (2,6-NDC) at variable temperature and different solvents. 3-D framework structures of 1 and 2 are formed through interconnection of fully deprotonated 2,6-NDC with trinuclear cluster of secondary building units. Further, both MOFs emitted blue fluorescence with diverse intensities in solid state at room temperature.