Luminescent Cd^IImetal-organic frameworks based on isoniazid using a mixed ligand approach

Herein, we report the syntheses and characterization of two novel Cd^II-based metal-organic frameworks (MOFs) with the formulae: [{Cd(INH)(hpdia)}·3H₂O]_α(Cd-MOF-1) and [{Cd(INH)(bdc)}·DMF]_α(Cd-MOF-2) (INH = isoniazid, hpdia = 5-(4-hydroxyphenylazo)isophthalic acid, and H₂bdc = 1,4-benzenedicarboxylic acid) using the mixed ligand and solvothermal protocol. Single crystal X-ray analysis reveals thatCd-MOF-1andCd-MOF-2display overall 2D porous framework architectures.Cd-MOF-1andCd-MOF-2have a two-dimensional zigzag network composed of a 4-connected uninodal network withsqltopology and point symbol {4·4·6·2}. TGA analysis suggests thatCd-MOF-1andCd-MOF-2are thermally stable. These MOFs exhibit fascinating luminescence properties.Cd-MOF-2shows intense blue emission whereasCd-MOF-1shows nearly visibly intense white light emission with a CIE index of (0.34, 0.32) having a color correlated temperature (CCT) of 5121 K. Herein, we show how one can tune their spectral output by varying the emissive and non-emissive organic linkers.