(Acetato-κ2 O,O′)(acetato-κO)bis(2-amino-3-methyl­pyridine-κN 1)cobalt(II)

Azadeh Tadjarodi; Keyvan Bijanzad; Behrouz Notash

doi:10.1107/S1600536812038664

. 2012 Sep 15;68(Pt 10):m1260–m1261. doi: 10.1107/S1600536812038664

(Acetato-κ² O,O′)(acetato-κO)bis(2-amino-3-methylpyridine-κN ¹)cobalt(II)

Azadeh Tadjarodi ^a,^*, Keyvan Bijanzad ^a, Behrouz Notash ^b

PMCID: PMC3470146 PMID: 23125590

Abstract

In the title compound, [Co(CH₃COO)₂(C₆H₈N₂)₂], the Co^II ion is five-coordinated by two pyridine N atoms from two 2-amino-3-methylpyridine ligands, two O atoms from one acetate ion and one O atom from another acetate ion in a distorted trigonal–bipyramidal geometry. The pyridine rings are nearly perpendicular to each other [dihedral angle = 84.49 (16)°]. The crystal packing is stabilized by intramolecular and intermolecular N—H⋯O hydrogen-bonding interactions.

Related literature

For related coordination compounds of 2-amino-3-methylpyridine, see: Arab Ahmadi et al. (2011 ▶); Tadjarodi et al. (2010 ▶, 2012 ▶); Castillo et al. (2001 ▶); Ziegler et al. (2000 ▶); Amani Komaei et al. (1999 ▶); Chen et al. (2005 ▶). For proton-transfer compounds of 2-amino-3-methylpyridine, see: Carnevale et al. (2010 ▶).

Experimental

Crystal data

[Co(C₂H₃O₂)₂(C₆H₈N₂)₂]
M _r = 393.31
Triclinic,
a = 8.1685 (16) Å
b = 10.452 (2) Å
c = 12.231 (2) Å
α = 69.58 (3)°
β = 79.94 (3)°
γ = 72.42 (3)°
V = 930.1 (4) Å³
Z = 2
Mo Kα radiation
μ = 0.95 mm⁻¹
T = 298 K
0.27 × 0.23 × 0.13 mm

Data collection

Stoe IPDS 2T diffractometer
Absorption correction: numerical (X-SHAPE and X-RED32; Stoe & Cie, 2005 ▶) T _min = 0.785, T _max = 0.886
11215 measured reflections
4996 independent reflections
2756 reflections with I > 2σ(I)
R _int = 0.062

Refinement

R[F ² > 2σ(F ²)] = 0.051
wR(F ²) = 0.096
S = 0.92
4996 reflections
242 parameters
3 restraints
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 0.35 e Å⁻³
Δρ_min = −0.19 e Å⁻³

Data collection: X-AREA (Stoe & Cie, 2005 ▶); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997 ▶); software used to prepare material for publication: WinGX (Farrugia, 1999 ▶).

Supplementary Material

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536812038664/xu5616sup1.cif

e-68-m1260-sup1.cif^{(20.9KB, cif)}

Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812038664/xu5616Isup2.hkl

e-68-m1260-Isup2.hkl^{(244.7KB, hkl)}

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Table 1. Selected bond lengths (Å).

Co1—O1	1.962 (2)
Co1—O3	2.352 (2)
Co1—O4	2.0028 (18)
Co1—N1	2.072 (2)
Co1—N3	2.074 (2)

Open in a new tab

Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2A⋯O4	0.85 (2)	2.17 (2)	2.965 (3)	157 (3)
N2—H2B⋯O2ⁱ	0.84 (2)	2.16 (2)	2.978 (3)	166 (3)
N4—H4A⋯O1	0.83 (3)	2.10 (3)	2.859 (3)	153 (3)
N4—H4B⋯O3ⁱⁱ	0.84 (2)	2.06 (2)	2.881 (3)	164 (3)

Open in a new tab

Symmetry codes: (i) Inline graphic ; (ii) .

Acknowledgments

The authors wish to acknowledge Iran University of Science and Technology (IUST) for financial support.

supplementary crystallographic information

Comment

2-Amino-3-methylpyridine (ampy) coordinates to metals mostly through the nitrogen atom of the pyridyl group (Arab Ahmadi et al., 2011; Tadjarodi et al., 2012 and 2010; Castillo et al., 2001; Ziegler et al., 2000; Amani Komaei et al., 1999) but it can also coordinate via the nitrogen atom of the amino group (Chen et al., 2005). In recent years, several structures of proton-transfer compounds, [(ampyH)₂CoX₄] (X = Cl, Br) have been reported by 2-Amino-3-methylpyridine (Carnevale et al. 2010).

Herein, we report the synthesis and structural determination of the title compound, [Co(ampy)₂(CH₃COO)₂]. The coordination sphere of the mononuclear complex includes three oxygen atoms from two acetate ions and two pyridyl nitrogen atoms from two ampy ligands thus constructing a distorted trigonal bipyramidal geometry (Fig. 1). In the structure of [Co(ampy)₂(CH₃COO)₂], several intramolecular and intermolecular N–H···O hydrogen bond interactions formed between the amino group of the ligand and the acetate oxygen atoms which can stabilize the crystal structure (Fig. 2 & Table 1).

Experimental

A solution of 2-amino-3-methylpyridine (1 mmol) in ethanol was added to an aqueous solution of Co(CH₃COO)₂.4H₂O (0.5 mmol) and stirred for 20 min at 50 °C. Slow evaporation of the resulting solution gave violet plate shaped crystals of the title compound suitable for X-ray analysis (decomposition >300 °C).