Synthesis, crystal structure, and fluorescence property of cobalt(II) and manganese(II) complexes based on N,N′-bis (4-pyridylmethyl)naphthalene diimide

ABSTRACTTwo complexes, {[Co(4-pmntd)(H2O)4·Co(4-pmntd)(H2O)4]·4(NO3)·3H2O}n (1), {[Mn(4-pmntd)(SCN)2]·2(C2H5OH)}n (2), (4-pmntd = N,N′-bis(4-pyridylmethyl)naphthalene diimide) were synthesized and characterized by elemental analyses, IR spectroscopy, thermogravimetric analyses, and X-ray single-crystal structure analysis. Complex 1 consisting of two kinds of 1D polymeric chains: 1D zigzag chain [Co(4-pmntd)(H2O)4] (A) and 1D linear chain [Co(4-pmntd)(H2O)4] (B), adjacent zigzag and linear chains in different layers are arranged in a cross-like fashion, resulting in a 3D plywood-like array. Complex 2 is a non-interpenetrating (4, 4)-sql net structure in edge-to-edge arrangement containing 1D channels. Their structural diversity, thermal stability, and fluorescence property of complexes 1 and 2 were investigated. Complex 2 shows enhanced fluorescence intensity at 420 nm upon the addition of 2 equiv of SCN− anion with respect to complex 2. The complex 2 is promising for detecting SCN− anion.