Bis(7-amino-2,4-dimethyl-1,8-naphthyridine)dinitratocadmium(II).

In the title compound, [Cd(NO(3))(2)(C(10)H(11)N(3))(2)], two naph-thyridine ring systems are coordinated to the Cd ion through the two N atoms in a bidentate chelating mode, whereas the remaining coordination sites are occupied by two O atoms from two different nitrate groups to complete the octahedral geometry. Inter-moleular N-H⋯O hydrogen bonds link the mol-ecules to form a one-dimensionnal sheet parallel to the ac plane. Weak slipped π-π stacking involving the naphthyridine ring systems stabilizes the structure.

In the title compound, [Cd(NO 3 ) 2 (C 10 H 11 N 3 ) 2 ], two naphthyridine ring systems are coordinated to the Cd ion through the two N atoms in a bidentate chelating mode, whereas the remaining coordination sites are occupied by two O atoms from two different nitrate groups to complete the octahedral geometry. Intermoleular N-HÁ Á ÁO hydrogen bonds link the molecules to form a one-dimensionnal sheet parallel to the ac plane. Weak slippedstacking involving the naphthyridine ring systems stabilizes the structure.
is the dihedral angle between the planes. DCC is the length of the CC vector (centroid to centroid). is the angle(s) subtended by the plane(s) normal to CC (offset angle). Cg1 is the centroid of ring N1/C1/C5-C8; Cg2 is the centroid of ring N2/C1/C5-C2.
In the title compound, two naphthyridine are coordinated to the Cd ion through two nitrogen atoms in bidentate chelating mode whereas the remaining coordination sites are occupied by two oxygen atoms from two different nitrates ( Intermoleular N-H···O hydrogen bonds link the molecules to form a one dimensionnal sheet parallel to the a axis (Table   1, Fig. 2). Weak slippest π-π stackings involving the naphthyridine rings stabilize the structure (Table 2).

Experimental
All reagents and solvents were used as obtained without further purification. The CHN elemental analyses were performed on a Perkin-Elmer model 2400 elemental analyzer. A solution of cadmium nitrate tetrahydrate (31.4 mg, 0.1 mmol) in methanol (3 ml) was added to L (52.2 mg, 0.3 mmol) in methanol (10 ml) to give a colorless solution. The methanol solution was filtered. The solution was left standing at room temperature for several days, colorless block crystals were isolated.

Refinement
All H atoms attached to C atoms and N atom were fixed geometrically and treated as riding with C-H = 0.93 Å (aromatic) or 0.96 Å (methyl) and N-H = 0.86 Å with U iso (H) = 1.2U eq (Caromatic or N) or U iso (H) = 1.5U eq (Cmethyl).