Bis(2-aminopyridine-κN¹)silver(I) nitrate

Abstract

The asymmetric unit of the title compound, [Ag(C5H6N2)2]NO3, consists of one and a half each of both cations and anions, the other halves being generated by crystallographic inversion centres. One of the AgI atoms lies on an inversion center and one of the nitrate ions is disordered across an inversion center. Each AgI atom is bicoordinated in a linear geometry by two N atoms from two 2-amino­pyridine ligands. In the crystal structure, the cations and anions are linked into a two-dimensional network parallel to (001) by N—H⋯O and C—H⋯O hydrogen bonds.

Bis[4-(dimethylamino)pyridine-κN1]silver(I) nitrate dihydrate

“…Table 2 shows a comparison between (I) and some related aminopyridine-Ag I compounds. Shorter Ag-N bond distances, wider N-Ag-N angles and hence weaker AgÁ Á ÁO interactions are reported for the related linear compounds [Ag(dmap) 2 ]PF 6 (Lin et al, 2008), [Ag(4-ampy) 2 ]NO 3 (Abu-Youssef et al, 2006a) and [Ag(2-ampy) 2 ]NO 3 (Fun et al, 2008) compared with those found in (I), while for the trigonal-planar and tetrahedral compounds [Ag 3 (NO 3 ) 2 (2-ampy) 4 ]NO 3 (Bowmaker et al, 2005) and {[Ag 4 (NO 3 ) 4 (3-ampy) 4 ]} n (Abu-Youssef et al, 2006b), longer Ag-N bond distances and narrower N-Ag-N angles are found. In the case of [Ag(dmap) 2 ]PF 6 (Lin et al, 2008), no interaction could be considered between the PF 6 À and Ag I ions, the shortest AgÁ Á ÁF distances being 3.007 (3) and 3.528 (6) Å .…”

“…This type of ligand can coordinate to the metal center either via the ring N atom alone (as a monodentate ligand) or via both the ring N atom and the amine group N atom (as bridging and/or bidentate ligand). When 2-aminopyridine (2-ampy) reacts with AgNO 3 in water/ethanol solution, three compounds are formed with different stoichiometric ratios, namely [Ag(2ampy) 2 ]NO 3 (Fun et al, 2008), ]NO 3 and [Ag 3 (NO 3 ) 2 (2-ampy) 4 ]NO 3 (Bowmaker et al, 2005). In the case of 3-and 4-aminopyridine, only one compound is known for each, viz.…”

Synthesis, Characterization and Antibacterial Properties of Complex [Ag(SCN)(2-NH2py)]

“…The asymmetric unit of complex consists of one Ag+ central ion, one 2-NH2py ligand and one thiocyanate ligand. The Ag-N NH2py bond length (Table 3) shows a longer bond compared to the Ag-N 2-NH2py bond length in complexes [Ag(2-NH2py)3(NO3)] (Ag-N 2.141-2.179 Å) [15] and [Ag(2-NH2py)2](NO3) (Ag-N 2.1406-2.1413 Å) [13]. This is due to the formation of polymers which causes the molecules to be close each other and the bond angles are distorted in a smaller direction.…”

“…Complexes with 2-,3-or 4-NH2py ligands show that NH2py tends to act as a monodentate ligand by binding to the central atom via the N pyridine ring. Complexes that have been reported such as [Ni(NCS)2(2-NH2py)2.C4H10O] [7], {∞[Cd(µ-SCN)2(4-NH2py)2]} [8], [Cu(SCN)2(x-NH2py)2] (x=2,3, or 4) [4], and [M(3-NH2py)2(dca)2] (M=Mn2+, Cu2+,Cd2+, or Co2+; dca = dicyanamide) [1,[9][10][11], [AgL(x-NH2py)2] [12][13][14][15][16] demonstrated the formation of polymer complexes via bridge formation by bidentate ligands such as dicyanamide, thiocyanate and azide. Several other complexes with monodentate ligands such as Cl¬ such as…”

“…The development of silver(I) complex compounds with pyridine and its derivatives has become an interesting topic because their structures allow them to form monomers, dimers and even polymers, as well as their biological activity which are quite extensive. Silver complexes with 2,3 and 4 aminopyridines have been reported to form complexes with various geometries such as, linear [12,13,16,21], trigonal geometry [15,21,22], square-planar geometry [23], tetrahedral [24] and etc. In general, the aminopyridines are bonded to central ions through the N atoms of the pyridine ring, but Golder et al, 2010 showed the formation of 1-dimensional polymers through 4aminopyridine bridge ligand in their complex.…”