Synthesis and structure of the manganese complex with 2-aminopyridine N-oxide

The complex Mn(apo)(6)Cl-2 (apo=2-aminopyridine N-oxide) was obtained by th e reaction of MnCl2. 4H(2)O with apo . HCl and NaOH in ethanol. A single-cr ystal X-ray study shows that the complex is mononuclear with octahedral coo rdination environment (MnC30H36N12O6Cl2). The oxygen atoms from apo ligands coordinate to the manganese atom forming Mn(apo)(6)Cl-2. The compound Mn(a po)(6)Cl-2 is hexagonally symmetric with space group R3, lattice constants: a = 12.010(2), b = 12.010(2), c = 20.232(4) Angstrom, gamma = 120 degrees, V = 2527.4(7) Angstrom (3), Z=3, M-r = 786.55, D-c=1.550 g/cm(3), mu= 0.61 4mm(-1), F(000) = 1221, R = 0.0541, R-w = 0.0580 for 1229 reflections with I>2 sigma (I). The distances between Mn(II) and O atoms are in the range fr om 2.171(5) to 2.184(5) Angstrom, and the distance between the chlorine ani on and N atom of amido group is 3.3 Angstrom. The dihedral angle between tw o adjacent pyridine ring planes is 59.19 (0.17)degrees.