The solid-state structures of two photoluminescent 2D silver(I) arenedisulfonate incorporating aminopyrimidyl ligands: Substituents influence on π⋯π interaction

Two silver(I) arenedisulfonate incorporating aminopyrimidyl ligands of the formula [Ag(apym)(nds)0.5]n (1) and [Ag(dmapym)(nds)0.5]n (2) (apym = 2-aminopyrimidine, dmapym = 2-amino-4,6-dimethylpyrimidine, H2nds = 1,5-naphthalenedisulfonic acid) were synthesized and characterized by element analysis, IR spectroscopy and X-ray single-crystal diffraction. Both 1 and 2 are undulated 2D 44-sql nets constructed by μ2-nds and μ2-aminopyrimidyl ligands incorporating Ag(I) centers. When apym was replaced by dmapym, no obvious change of structures from 1 to 2 was observed, however, substituent effect on the structures was unambiguously presented in π⋯π interactions. The shortest centroid⋯centroid distances between pyrimidyl and naphthyl of 1 and 2 are 3.623(5) and 4.091(3) Å, respectively, which is due to the combination of steric and electronic effect of two more methyl groups. Moreover, the photoluminescence properties of 1 and 2 were investigated in the solid state at room temperature.