Ruthenium(IV) nitroso complexes with morpholine: the crystal structure of (OC4H8NH2)(2)[Ru(NO)Cl-4(OH)]

The reaction of morpholine NHC4H8O (Morph) with (NH4)(2)[Ru(NO)Cl-5] was st udied. Procedures for the synthesis of (MorphH)(2)[Ru(NO)Cl-4(OH)] (I), (Mo rphH)(2)[Ru(NO)Cl-5] (II), [Ru(NO)Cl(OH)(2)(NH3)H2O)] (III), and [Ru(NO)Cl( OH)(2)(NH3)(2)] (IV) were developed. The structures of I-IV were studied by IR spectroscopy. Complex I was performed studied by X-ray crystallography. Its crystals are triclinic: a = 9.675 Angstrom, b = 10.210 Angstrom, c = 1 0.668 Angstrom, alpha = 114.97 degrees, beta = 101.25 degrees, gamma = 103. 30 degrees, Z = 2, space group PI. The structural units in I are the comple x anions [Ru(NO)Cl-4(OH)](2-) and the morpholinium cations (NH2C4H8O)(+). I n the Ru coordination polyhedron, the conventional equatorial plane is occu pied by the four chlorine atoms. The Ru atom is displaced from this plane b y 0.1 Angstrom toward one apex occupied by nitrogen of the nitroso group. T he second apex is occupied by the hydroxo oxygen atom. The Ru-N distance (1 .724 Angstrom) is typical of a linear nitroso group. Both independent morph olinium cations have chair conformation.