Based The Pyrazine Derivatives Coordination Polymers Assembled With Nature Study

In this paper, twenty-five coordination complexes of 2-aminopyrazine and 2-amino-3-carboxyl pyrazine with different transition metal salts and rare earth compounds were synthesized, which possess an increasing dimensionality from zero-dimensional, one-dimensional to two-dimensional architectures. These complexes were characterized by element analysis, IR, PL and single crystal X-ray diffraction. The low-dimensional complexes are easily formed by monodentate coordination mode, whereas the 2-aminopyrazine in the high dimensional complexes adopts bidentate coordination mode, in which the Cd(â…¡) complex exhibits strong blue emission. For the rare earth complexes, three types of rare earth network structures could be modulated through lanthanide contraction effect. Under the catalysis of Pr and Nd, 2-amino-3-carboxyl pyrazine hydrolyzed into oxalic acid via in situ reaction. The 1-D lanthanide complex and the 2-D europium complex exhibit strong blue and red emission, respectively. Moreover, the structure evolution from mononuclear, 1-D, 2-D to 3-D porous framework in alkaline earth metal complexes based on 4,6-dihydroxypyrimidine can be attributed to the increasing radius of metal ions, and these complexes exhibit strong blue emissions.