(Naphthalene-2,3-diolato-κ2 O,O′)[tris(pyridin-2-ylmethyl)amine-κ4 N]cobalt(III) tetraphenylborate acetone monosolvate hemihydrate

In the title salt, [Co(C10H6O2)(C18H18N4)](C24H20B)·C3H6O·0.5H2O, the CoIII ion in the complex cation is six-coordinated in a rigid octahedral N4O2 geometry. The asymmetric unit contains one complete [Co(C10H6O2)(C18H18N4)]+ unit, one tetraphenylborate counter-anion and one acetone and one water molecule that is located on an inversion centre. All the features of the CoIII ion are fully consistent with the formulation of the cation as a Co3+–catecholate complex. Variable-temperature magnetic measurements in the region 2–380 K show a obvious diamagnetism over the observed temperature range.

In the title salt, [Co(C 10 H 6 O 2 )(C 18 H 18 N 4 )](C 24 H 20 B)Á-C 3 H 6 OÁ0.5H 2 O, the Co III ion in the complex cation is sixcoordinated in a rigid octahedral N 4 O 2 geometry. The asymmetric unit contains one complete [Co(C 10 H 6 O 2 )-(C 18 H 18 N 4 )] + unit, one tetraphenylborate counter-anion and one acetone and one water molecule that is located on an inversion centre. All the features of the Co III ion are fully consistent with the formulation of the cation as a Co 3+catecholate complex. Variable-temperature magnetic measurements in the region 2-380 K show a obvious diamagnetism over the observed temperature range.

Experimental
Crystal data [Co(C 10  exhibit interesting properties (Li et al., 2010;Tao et al.,2006). Up to now, great effort have been devoted to search for new types of thus catecholates to construct more functional materials. Naphthalene-2,3-diol, acting as one kind of catecholates, possesses the bi-dentate chelate mode and much stronger π-conjugate systems. Complexes formed by the connection of transitional metals and naphthalene-2,3-diol have been synthesized and crystallographically characterized (Tinoco et al., 2008), but rare cobalt ones documented (Guo et al., 2011).

Experimental
To a well stirred methanol solution (20 ml) containing tpa (2.02 mmol) and CoCl 2 .6H 2 O(2.0 mmol) was added a methanol solution (10 ml) containing ND (0.5 mmol) and triethylamine (140 µL) under inert atmosphere in methanol (15 ml). The resulting mixture was gently stirred at room temperature for 2 h and then NaBPh 4 (0.5 mmol) was added for 1. The precipitation was dissolved in the mixture of acetone and water (5 ml/ 1 mL), and green crystals of compound 1 were obtained by slow evaporation of the filtrate.

Refinement
All H atoms were placed geometrically with C-H = 0.93 (aromatic) or 0.96 Å (CH 2 ), and refined using a riding atom model with their isotropic displacement factors, U iso fixed at 1.2 time the U eq of the parent C. The oxygen atom and hydrogen atoms on water molecule had been modeled over two sites with the sum of their respective occupancies equal to one.  the asymmetric unit of the title compound 1 showing the atomic numbering and 30% probability displacement ellipsoids.

(Naphthalene-2,3-diolato-κ 2 O,O′)[tris(pyridin-2-ylmethyl)amine-κ 4 N]cobalt(III)
where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max = 0.005 Δρ max = 1.28 e Å −3 Δρ min = −0.68 e Å −3 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.