Tris(3-amino-5,6-dimethyl-1,2,4-triazine-κN 2)silver(I) trifluromethanesulfonate–3-amino-5,6-dimethyl-1,2,4-triazine (1/1)

The asymmetric unit of the title compound, [Ag(C5H8N4)3](CF3O3S)·C5H8N4, contains two cations, two anions and two uncoordinated 3-amino-5,6-dimethyl-1,2,4-triazine (admt) ligands. It was prepared from the reaction of silver trifluoromethanesulfonate and admt in a 2:3 molar ratio. Both silver(I) ions are bonded to three admt molecules via their 2-position triazine N atoms in almost regular trigonal–planar geometries. Three intramolecular N—H⋯N hydrogen bonds between adjacent admt molecules in each cation help to maintain their overall near planarities (r.m.s. deviations for the 28 non-H atoms = 0.139 and 0.153 Å). In the crystal, numerous N—H⋯N, N—H⋯O, C—H⋯O, C—H⋯N and C—H⋯F hydrogen-bonding interactions link the components into a three-dimensional network.


Comment
Papers on structural and kinetic features of silver(I) complexes containing heterocyclic-N ligands are growing explosively due to their participation in biological process and their applicatioins in lunminescence and catalysis materials (Jin et al.,2010a, 2010b, Effendy et al., 2007, Sang et al.,2006. In our research, we select multifunctional ligand 3-Amino-5,6-di-  (Self et al.,1991). As a part of the extension of our study on the emission of silver (I) complexes of heterocyclic-N ligands, we synthesized the first silver (I) complex of ADMT, [Ag(ADMT) 3 ] 2 (OTf) 2 .(ADMT) 2 .
We also tried to synthesize more silver(I) complexes of ADMT, but failed. When starting material AgOTf was replaced by AgBr, only crystalized ADMT ligand was obtained, and when the title compound was further reacting with PPh 3 , only the Ag:PPh3(1:4) adduct was obtained (Jiang et al., 2011). The failure of the above reactions maybe is because the coordination ability of ADMT to silver(I) is weaker than PPh 3 ligand and the bromide ion.
Subsequent slow evaporation of the filtrate resulted in the formation of yellow crystals of the adduct of AgOTf:ADMT(1:4).
Yellow prisms were selected directly from the sample as prepared.

Refinement
All hydrogen atoms were located in the calculated sites and included in the final refinement in the riding model approximation with displacement parameters derived from the parent atoms to which they were bonded.  Fig. 1. Perspective view of a basic unit of the title complex. Atoms are displayed as elliposoids at the 50% probability level Tris(3-amino-5,6-dimethyl-1,2,4-triazine-κN 2 )silver(I) trifluromethanesulfonate-3-amino-5,6-dimethyl-1,2,4triazine (1/1) Crystal data [Ag(C 5  Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.