Silver complexes with 2-amino-4-methylpyrimidine: Synthesis, crystal structure, and luminescent properties

Reactions of AgReO4 and AgCH3SO3 with L = 2-amino-4-methylpyrimidine (Ampym, C5H7N3) in a ratio of 1: 2 in acetonitrile gave the complexes [AgL2(ReO4)] (I) and [AgL2(CH3SO3)] (II). Their structures were determined. The crystals of complex I are monoclinic, space group C2/c, a = 5.985(1), b = 3.465(1), c = 19.071(1) Å, β = 96.52(1)°, V = 1527.0(3) Å3, ρcalcd = 2.507 g/cm3, Z = 4. The crystals of complex II are orthorhombic, space group Pbca, a = 14.784(1), b = 11.991(1), c = 17.711(1) Å, V = 3139.7(4) Å3, ρcalcd= 1.782 g/cm3, Z = 8. Structure I shows discrete cationic complexes [AgL2]+. The silver atom is virtually linearly coordinated to two N atoms of crystallographically equivalent ligands L (Ag-N, 2.156(4) Å; the angle NAgN, 174.7(4)°). The complex cations are united into zigzag chains through the hydrogen bonds N-H...N. The resulting chains are linked by the hydrogen bonds N-H...O to uncoordinated perrhenate anions to form 2D supramolecular layers. In structure II, the Ag+ ion is coordinated by two crystallographically non-equivalent ligands L in a distorted linear fashion: Ag(1)-N(1), 2.166(7) Å;Ag(1)-N(4), 2.181(6) Å; the angle NAgN, 157.2(2)°. The anions CH3SO3− are weakly linked to the Ag+ ions (Ag...O 2.72 Å) and are hydrogen-bonded to the complex cations [AgL2]+, uniting them into supramolecular ribbons.