cis-Bis[2-(cyclo-propyl-imino-meth-yl)-6-methoxy-phenolato]bis-(thio-cyanato)cobalt(II).

In the title compound, [Co(NCS)(2)(C(11)H(13)NO(2))(2)], a mononuclear Schiff base cobalt(II) complex, the Co atom is six-coordinated by four O atoms from two Schiff base ligands, and by two N atoms from two thio-cyanate ligands, forming a distorted octa-hedral geometry. The central Co atom lies on a twofold rotation axis. An intramolecular N-H⋯O hydrogen bond is present.

In the title compound, [Co(NCS) 2 (C 11 H 13 NO 2 ) 2 ], a mononuclear Schiff base cobalt(II) complex, the Co atom is sixcoordinated by four O atoms from two Schiff base ligands, and by two N atoms from two thiocyanate ligands, forming a distorted octahedral geometry. The central Co atom lies on a twofold rotation axis. An intramolecular N-HÁ Á ÁO hydrogen bond is present.

S1. Comment
Schiff base complexes have been studied extensively due to their interesting structures and numerous applications (Mukhopadhyay et al., 2003;Kraihanzel et al., 1981;Di Bella et al., 1997;Loeb et al., 1984). Previously, the author has reported the crystal structure of a Schiff base zinc(II) complex (Wang, 2007a) and a Schiff base nickel(II) complex (Wang, 2007b). As part of a further investigation of Schiff base complexes, the structure of the title compound, a mononuclear cobalt(II) complex, is reported here.
The octahedral coordination environment of Co II atom in the title compound is formed by four O atoms from two Schiff base ligands, and by two N atoms from two thiocyanate ligands (Fig. 1). The central Co atom lies on a twofold axis symmetry position.The coordination bond distances and angles are listed in Table 1.

S3. Refinement
H1 was located from a difference Fourier map and refined isotropically, with N-H distance restrained to 0.90 (1) Å.
Other H atoms were positioned geometrically (C-H = 0.93-0.98 Å) and refined as riding, with U iso (H) = 1.2 or 1.5U eq (C).  The molecular structure of title compound, showing the numbering scheme and displacement ellipsoids drawn at the 30% probability level

cis-Bis[2-(cyclopropyliminomethyl)-6-methoxyphenolato]bis(thiocyanato)cobalt(II)
Crystal data 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 R-factors(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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq