[N'-(3-Meth-oxy-2-oxidobenzyl-idene-κO)benzohydrazidato-κN',O]tris-(pyridine-κN)cobalt(III) perchlorate.

In the mononuclear title compound, [Co(III)(C(15)H(12)N(2)O(3))(C(5)H(5)N)(3)]ClO(4), the Co(III) ion is coordinated by three pyridine mol-ecules and one N'-(3-meth-oxy-2-oxidobenzyl-idene)benzohydrazidate Schiff base ligand in an O,N,O'-tridentate manner. The Co(III) ion adopts a distorted CoN(4)O(2) octa-hedral coordination environment.

Related literature

For applications of Schiff base compounds, see: Ando et al. (2004 ▶); Guo et al. (2010 ▶). For the preparation of the Schiff base, see: Pouralimardan et al. (2007 ▶); Sacconi (1954 ▶). For related structures, see: Monfared et al. (2009 ▶); Sun et al. (2008 ▶); Yu, Zhao et al. (2010 ▶); Yu, Li et al. (2010 ▶); Zhang et al. (2004 ▶); Zou et al. (2010 ▶).

Experimental

Crystal data

[Co(C15H12N2O3)(C5H5N)3]ClO4

M = 663.95

Monoclinic,

a = 10.7591 (5) Å

b = 13.2318 (6) Å

c = 21.0558 (10) Å

β = 94.610 (1)°

V = 2987.9 (2) Å3

Z = 4

Mo Kα radiation

μ = 0.72 mm−1

T = 185 K

0.20 × 0.18 × 0.12 mm

Data collection

Bruker APEXII CCD area-detector diffractometer

Absorption correction: multi-scan (SADABS; Bruker, 2004 ▶) T min = 0.869, T max = 0.919

7543 measured reflections

4991 independent reflections

4431 reflections with I > 2σ(I)

R int = 0.027

Refinement

R[F 2 > 2σ(F 2)] = 0.036

wR(F 2) = 0.072

S = 1.00

4991 reflections

398 parameters

2 restraints

H-atom parameters constrained

Δρmax = 0.35 e Å−3

Δρmin = −0.29 e Å−3

Absolute structure: Flack (1983 ▶), 2332 Friedel pairs

Flack parameter: 0.011 (12)

Data collection: APEX2 (Bruker, 2004 ▶); cell refinement: SAINT (Bruker, 2004 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: DIAMOND (Brandenburg, 1999 ▶); software used to prepare material for publication: SHELXL97 and publCIF (Westrip, 2010 ▶).

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536811004715/mw2001sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536811004715/mw2001Isup2.hkl

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

[Co(C15H12N2O3)(C5H5N)3]ClO4	F(000) = 1368
Mr = 663.95	Dx = 1.476 Mg m−3
Monoclinic, Cc	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: C -2yc	Cell parameters from 4029 reflections
a = 10.7591 (5) Å	θ = 4.9–50.1°
b = 13.2318 (6) Å	µ = 0.72 mm−1
c = 21.0558 (10) Å	T = 185 K
β = 94.610 (1)°	Block, brown
V = 2987.9 (2) Å3	0.20 × 0.18 × 0.12 mm
Z = 4

Bruker APEXII CCD area-detector diffractometer	4991 independent reflections
Radiation source: fine-focus sealed tube	4431 reflections with I > 2σ(I)
graphite	Rint = 0.027
φ and ω scans	θmax = 25.1°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Bruker, 2004)	h = −12→12
Tmin = 0.869, Tmax = 0.919	k = −15→10
7543 measured reflections	l = −24→25

Refinement on F2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.036	H-atom parameters constrained
wR(F2) = 0.072	w = 1/[σ2(Fo2) + (0.0182P)2] where P = (Fo2 + 2Fc2)/3
S = 1.00	(Δ/σ)max = 0.001
4991 reflections	Δρmax = 0.35 e Å−3
398 parameters	Δρmin = −0.29 e Å−3
2 restraints	Absolute structure: Flack (1983), 2332 Friedel pairs
Primary atom site location: structure-invariant direct methods	Flack parameter: 0.011 (12)

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

	x	y	z	Uiso*/Ueq
Cl1	0.16794 (8)	0.46289 (8)	0.39641 (4)	0.0359 (2)
Co1	0.43297 (3)	0.52399 (3)	0.15848 (2)	0.02070 (11)
C1	−0.0228 (3)	0.4207 (3)	0.15340 (18)	0.0328 (9)
H1A	0.0004	0.3967	0.1952	0.039*
C2	−0.1460 (3)	0.4165 (3)	0.12945 (19)	0.0374 (10)
H2	−0.2070	0.3888	0.1546	0.045*
C3	−0.1808 (3)	0.4523 (3)	0.06960 (19)	0.0366 (9)
H3	−0.2658	0.4495	0.0535	0.044*
C4	−0.0923 (3)	0.4925 (3)	0.03236 (16)	0.0299 (8)
H4	−0.1162	0.5174	−0.0091	0.036*
C5	0.0310 (3)	0.4960 (2)	0.05629 (16)	0.0243 (8)
H5	0.0917	0.5238	0.0309	0.029*
C6	0.0675 (3)	0.4598 (2)	0.11655 (15)	0.0203 (7)
C7	0.1985 (3)	0.4645 (2)	0.14193 (15)	0.0211 (7)
C8	0.4045 (3)	0.3970 (3)	0.26468 (16)	0.0257 (8)
H8	0.3563	0.3500	0.2863	0.031*
C9	0.5224 (3)	0.4264 (3)	0.29441 (16)	0.0272 (8)
C10	0.6075 (3)	0.4826 (2)	0.26093 (16)	0.0244 (7)
C11	0.7181 (3)	0.5184 (3)	0.29505 (18)	0.0309 (8)
C12	0.7422 (4)	0.4979 (3)	0.35821 (19)	0.0405 (10)
H12	0.8168	0.5219	0.3804	0.049*
C13	0.6570 (4)	0.4416 (3)	0.3905 (2)	0.0439 (11)
H13	0.6743	0.4275	0.4346	0.053*
C14	0.5498 (3)	0.4068 (3)	0.35949 (17)	0.0360 (9)
H14	0.4928	0.3688	0.3821	0.043*
C15	0.9083 (4)	0.6080 (4)	0.2875 (2)	0.0614 (14)
H15A	0.8939	0.6510	0.3241	0.074*
H15B	0.9524	0.6467	0.2566	0.074*
H15C	0.9587	0.5494	0.3020	0.074*
C16	0.5344 (3)	0.3336 (3)	0.11885 (17)	0.0279 (8)
H16	0.5618	0.3288	0.1628	0.033*
C17	0.5655 (3)	0.2574 (3)	0.07847 (18)	0.0323 (9)
H17	0.6123	0.2008	0.0946	0.039*
C18	0.5280 (4)	0.2640 (3)	0.01462 (19)	0.0400 (10)
H18	0.5497	0.2130	−0.0142	0.048*
C19	0.4576 (3)	0.3469 (3)	−0.00668 (17)	0.0356 (9)
H19	0.4300	0.3539	−0.0505	0.043*
C20	0.4281 (3)	0.4198 (3)	0.03744 (16)	0.0290 (9)
H20	0.3780	0.4757	0.0231	0.035*
C21	0.4288 (3)	0.6714 (3)	0.05572 (16)	0.0272 (8)
H21	0.3416	0.6592	0.0539	0.033*
C22	0.4729 (4)	0.7378 (3)	0.01264 (17)	0.0346 (9)
H22	0.4175	0.7704	−0.0182	0.042*
C23	0.6008 (4)	0.7560 (3)	0.01530 (18)	0.0342 (9)
H23	0.6348	0.8008	−0.0140	0.041*
C24	0.6760 (4)	0.7082 (3)	0.06089 (18)	0.0346 (9)
H24	0.7633	0.7204	0.0640	0.041*
C25	0.6260 (3)	0.6423 (3)	0.10249 (17)	0.0280 (8)
H25	0.6799	0.6091	0.1338	0.034*
C26	0.2924 (3)	0.6392 (3)	0.24550 (17)	0.0311 (9)
H26	0.2249	0.5971	0.2303	0.037*
C27	0.2755 (4)	0.7074 (3)	0.29368 (19)	0.0407 (10)
H27	0.1967	0.7133	0.3106	0.049*
C28	0.3734 (4)	0.7665 (3)	0.31680 (18)	0.0434 (11)
H28	0.3639	0.8119	0.3510	0.052*
C29	0.4846 (4)	0.7596 (3)	0.29042 (17)	0.0379 (9)
H29	0.5528	0.8012	0.3053	0.045*
C30	0.4966 (3)	0.6918 (2)	0.24201 (16)	0.0293 (8)
H30	0.5742	0.6876	0.2236	0.035*
N1	0.2366 (2)	0.4037 (2)	0.18851 (12)	0.0218 (6)
N2	0.3587 (2)	0.4305 (2)	0.20981 (13)	0.0221 (7)
N3	0.4673 (2)	0.4141 (2)	0.09866 (13)	0.0236 (7)
N4	0.5022 (2)	0.6234 (2)	0.09999 (13)	0.0226 (7)
N5	0.4026 (2)	0.6309 (2)	0.21957 (12)	0.0231 (7)
O1	0.2693 (2)	0.53324 (17)	0.11795 (11)	0.0231 (6)
O2	0.5914 (2)	0.50462 (18)	0.19950 (11)	0.0249 (6)
O3	0.7924 (2)	0.5744 (2)	0.25842 (12)	0.0397 (7)
O4	0.0449 (2)	0.4311 (2)	0.40770 (12)	0.0444 (7)
O5	0.1830 (3)	0.4614 (2)	0.33036 (12)	0.0529 (8)
O6	0.1873 (4)	0.5628 (3)	0.41864 (19)	0.1058 (16)
O7	0.2518 (3)	0.3989 (4)	0.4303 (2)	0.1226 (19)

	U11	U22	U33	U12	U13	U23
Cl1	0.0324 (5)	0.0473 (6)	0.0278 (5)	−0.0055 (5)	0.0017 (4)	−0.0020 (4)
Co1	0.0196 (2)	0.0223 (2)	0.0201 (2)	0.0008 (2)	0.00069 (16)	0.0003 (2)
C1	0.031 (2)	0.039 (2)	0.029 (2)	0.0017 (17)	0.0005 (17)	0.0075 (18)
C2	0.0226 (19)	0.048 (2)	0.042 (2)	−0.0104 (19)	0.0074 (18)	0.001 (2)
C3	0.0205 (18)	0.036 (2)	0.053 (3)	−0.0018 (17)	−0.0017 (18)	−0.0009 (19)
C4	0.0265 (19)	0.035 (2)	0.027 (2)	0.0033 (17)	−0.0041 (16)	0.0033 (16)
C5	0.0213 (18)	0.0247 (19)	0.0279 (19)	−0.0019 (15)	0.0080 (15)	0.0005 (15)
C6	0.0212 (16)	0.0208 (18)	0.0190 (17)	0.0007 (14)	0.0019 (13)	−0.0030 (14)
C7	0.0209 (17)	0.0215 (18)	0.0212 (18)	−0.0024 (14)	0.0044 (14)	−0.0049 (15)
C8	0.0300 (19)	0.025 (2)	0.023 (2)	0.0059 (16)	0.0062 (16)	0.0068 (16)
C9	0.0233 (18)	0.030 (2)	0.028 (2)	0.0036 (16)	−0.0002 (15)	0.0020 (16)
C10	0.0230 (18)	0.0251 (18)	0.0240 (19)	0.0065 (16)	−0.0047 (14)	0.0001 (16)
C11	0.0258 (19)	0.030 (2)	0.036 (2)	0.0004 (16)	−0.0044 (16)	0.0023 (17)
C12	0.036 (2)	0.049 (3)	0.034 (2)	0.0016 (19)	−0.0123 (17)	0.0012 (19)
C13	0.040 (2)	0.062 (3)	0.028 (2)	−0.001 (2)	−0.0042 (18)	0.003 (2)
C14	0.033 (2)	0.044 (2)	0.030 (2)	0.0042 (18)	−0.0036 (17)	0.0096 (18)
C15	0.042 (3)	0.070 (3)	0.068 (3)	−0.025 (2)	−0.017 (2)	0.019 (3)
C16	0.0209 (17)	0.029 (2)	0.034 (2)	0.0002 (16)	0.0039 (15)	0.0010 (16)
C17	0.028 (2)	0.024 (2)	0.045 (2)	0.0037 (16)	0.0055 (18)	−0.0034 (17)
C18	0.041 (2)	0.032 (2)	0.048 (3)	0.0020 (19)	0.015 (2)	−0.0157 (19)
C19	0.043 (2)	0.039 (2)	0.025 (2)	−0.0064 (19)	0.0038 (17)	−0.0085 (17)
C20	0.034 (2)	0.0222 (19)	0.030 (2)	−0.0026 (17)	0.0018 (17)	−0.0033 (16)
C21	0.0302 (19)	0.024 (2)	0.027 (2)	−0.0002 (16)	0.0018 (16)	0.0007 (16)
C22	0.044 (2)	0.035 (2)	0.024 (2)	0.0009 (19)	−0.0030 (18)	0.0046 (17)
C23	0.046 (2)	0.027 (2)	0.031 (2)	−0.006 (2)	0.0118 (19)	0.0030 (18)
C24	0.032 (2)	0.033 (2)	0.039 (2)	−0.0063 (18)	0.0079 (17)	−0.0001 (18)
C25	0.0244 (19)	0.030 (2)	0.030 (2)	−0.0004 (16)	0.0044 (16)	0.0021 (16)
C26	0.035 (2)	0.030 (2)	0.029 (2)	0.0049 (17)	0.0048 (17)	−0.0030 (16)
C27	0.051 (3)	0.032 (2)	0.041 (2)	0.005 (2)	0.021 (2)	−0.0032 (19)
C28	0.071 (3)	0.033 (3)	0.027 (2)	0.000 (2)	0.009 (2)	−0.0062 (18)
C29	0.049 (2)	0.030 (2)	0.033 (2)	−0.0051 (19)	−0.0034 (19)	−0.0027 (17)
C30	0.034 (2)	0.0231 (19)	0.030 (2)	−0.0036 (17)	0.0001 (16)	−0.0008 (16)
N1	0.0174 (14)	0.0254 (16)	0.0220 (15)	−0.0027 (12)	−0.0023 (11)	0.0008 (12)
N2	0.0221 (15)	0.0241 (17)	0.0204 (16)	0.0015 (13)	0.0032 (12)	−0.0018 (13)
N3	0.0206 (15)	0.0267 (17)	0.0237 (17)	0.0005 (13)	0.0039 (13)	0.0009 (13)
N4	0.0235 (15)	0.0204 (16)	0.0240 (16)	−0.0005 (13)	0.0023 (13)	−0.0032 (12)
N5	0.0279 (16)	0.0214 (16)	0.0201 (16)	0.0015 (14)	0.0022 (13)	0.0005 (13)
O1	0.0204 (13)	0.0250 (14)	0.0240 (14)	−0.0020 (10)	0.0016 (11)	0.0028 (11)
O2	0.0183 (12)	0.0336 (15)	0.0223 (14)	−0.0002 (10)	−0.0011 (11)	0.0032 (11)
O3	0.0259 (13)	0.0492 (18)	0.0421 (16)	−0.0111 (13)	−0.0093 (12)	0.0085 (14)
O4	0.0353 (15)	0.0655 (19)	0.0331 (15)	−0.0087 (14)	0.0075 (12)	−0.0004 (13)
O5	0.0571 (18)	0.073 (2)	0.0310 (16)	−0.0146 (16)	0.0199 (14)	−0.0125 (14)
O6	0.170 (4)	0.074 (3)	0.082 (3)	−0.071 (3)	0.058 (3)	−0.050 (2)
O7	0.052 (2)	0.178 (5)	0.137 (4)	0.029 (3)	0.003 (2)	0.094 (4)

Cl1—O7	1.392 (4)	C15—O3	1.416 (4)
Cl1—O5	1.413 (3)	C15—H15A	0.9800
Cl1—O6	1.412 (4)	C15—H15B	0.9800
Cl1—O4	1.427 (2)	C15—H15C	0.9800
Co1—O2	1.866 (2)	C16—N3	1.338 (4)
Co1—N2	1.864 (3)	C16—C17	1.377 (5)
Co1—O1	1.898 (2)	C16—H16	0.9500
Co1—N5	1.957 (3)	C17—C18	1.375 (5)
Co1—N3	1.977 (3)	C17—H17	0.9500
Co1—N4	1.987 (3)	C18—C19	1.387 (5)
C1—C2	1.381 (5)	C18—H18	0.9500
C1—C6	1.391 (4)	C19—C20	1.393 (5)
C1—H1A	0.9500	C19—H19	0.9500
C2—C3	1.370 (5)	C20—N3	1.326 (4)
C2—H2	0.9500	C20—H20	0.9500
C3—C4	1.388 (5)	C21—N4	1.334 (4)
C3—H3	0.9500	C21—C22	1.374 (5)
C4—C5	1.381 (5)	C21—H21	0.9500
C4—H4	0.9500	C22—C23	1.394 (5)
C5—C6	1.384 (5)	C22—H22	0.9500
C5—H5	0.9500	C23—C24	1.361 (5)
C6—C7	1.468 (4)	C23—H23	0.9500
C7—O1	1.314 (4)	C24—C25	1.376 (5)
C7—N1	1.309 (4)	C24—H24	0.9500
C8—N2	1.297 (4)	C25—N4	1.352 (4)
C8—C9	1.423 (5)	C25—H25	0.9500
C8—H8	0.9500	C26—N5	1.349 (4)
C9—C14	1.402 (5)	C26—C27	1.381 (5)
C9—C10	1.411 (4)	C26—H26	0.9500
C10—O2	1.324 (4)	C27—C28	1.369 (5)
C10—C11	1.422 (4)	C27—H27	0.9500
C11—O3	1.372 (4)	C28—C29	1.362 (5)
C11—C12	1.361 (5)	C28—H28	0.9500
C12—C13	1.400 (5)	C29—C30	1.372 (5)
C12—H12	0.9500	C29—H29	0.9500
C13—C14	1.360 (5)	C30—N5	1.349 (4)
C13—H13	0.9500	C30—H30	0.9500
C14—H14	0.9500	N1—N2	1.399 (3)
O7—Cl1—O5	112.1 (2)	H15A—C15—H15B	109.5
O7—Cl1—O6	109.1 (3)	O3—C15—H15C	109.5
O5—Cl1—O6	108.3 (2)	H15A—C15—H15C	109.5
O7—Cl1—O4	107.9 (2)	H15B—C15—H15C	109.5
O5—Cl1—O4	109.92 (16)	N3—C16—C17	122.6 (3)
O6—Cl1—O4	109.6 (2)	N3—C16—H16	118.7
O2—Co1—N2	93.38 (11)	C17—C16—H16	118.7
O2—Co1—O1	175.67 (11)	C18—C17—C16	119.4 (4)
N2—Co1—O1	82.99 (11)	C18—C17—H17	120.3
O2—Co1—N5	89.42 (11)	C16—C17—H17	120.3
N2—Co1—N5	89.80 (12)	C17—C18—C19	118.4 (3)
O1—Co1—N5	92.92 (11)	C17—C18—H18	120.8
O2—Co1—N3	89.06 (11)	C19—C18—H18	120.8
N2—Co1—N3	89.56 (11)	C18—C19—C20	118.7 (3)
O1—Co1—N3	88.55 (10)	C18—C19—H19	120.7
N5—Co1—N3	178.31 (13)	C20—C19—H19	120.7
O2—Co1—N4	90.21 (11)	N3—C20—C19	122.5 (3)
N2—Co1—N4	176.30 (13)	N3—C20—H20	118.7
O1—Co1—N4	93.39 (11)	C19—C20—H20	118.7
N5—Co1—N4	91.12 (10)	N4—C21—C22	123.3 (3)
N3—Co1—N4	89.61 (12)	N4—C21—H21	118.3
C2—C1—C6	120.3 (3)	C22—C21—H21	118.3
C2—C1—H1A	119.9	C21—C22—C23	118.5 (4)
C6—C1—H1A	119.9	C21—C22—H22	120.8
C3—C2—C1	120.4 (3)	C23—C22—H22	120.8
C3—C2—H2	119.8	C24—C23—C22	118.5 (4)
C1—C2—H2	119.8	C24—C23—H23	120.8
C2—C3—C4	120.2 (3)	C22—C23—H23	120.8
C2—C3—H3	119.9	C23—C24—C25	120.2 (3)
C4—C3—H3	119.9	C23—C24—H24	119.9
C5—C4—C3	119.3 (3)	C25—C24—H24	119.9
C5—C4—H4	120.3	N4—C25—C24	121.8 (3)
C3—C4—H4	120.3	N4—C25—H25	119.1
C4—C5—C6	121.1 (3)	C24—C25—H25	119.1
C4—C5—H5	119.4	N5—C26—C27	121.4 (4)
C6—C5—H5	119.4	N5—C26—H26	119.3
C5—C6—C1	118.7 (3)	C27—C26—H26	119.3
C5—C6—C7	120.9 (3)	C28—C27—C26	119.5 (4)
C1—C6—C7	120.4 (3)	C28—C27—H27	120.3
O1—C7—N1	123.9 (3)	C26—C27—H27	120.3
O1—C7—C6	117.3 (3)	C29—C28—C27	119.5 (4)
N1—C7—C6	118.7 (3)	C29—C28—H28	120.2
N2—C8—C9	124.0 (3)	C27—C28—H28	120.2
N2—C8—H8	118.0	C28—C29—C30	119.0 (4)
C9—C8—H8	118.0	C28—C29—H29	120.5
C14—C9—C10	119.5 (3)	C30—C29—H29	120.5
C14—C9—C8	119.3 (3)	N5—C30—C29	122.6 (3)
C10—C9—C8	121.0 (3)	N5—C30—H30	118.7
O2—C10—C9	124.4 (3)	C29—C30—H30	118.7
O2—C10—C11	117.3 (3)	C7—N1—N2	108.2 (3)
C9—C10—C11	118.3 (3)	C8—N2—N1	118.6 (3)
O3—C11—C12	125.7 (3)	C8—N2—Co1	126.4 (3)
O3—C11—C10	113.5 (3)	N1—N2—Co1	114.7 (2)
C12—C11—C10	120.9 (3)	C20—N3—C16	118.4 (3)
C11—C12—C13	120.0 (4)	C20—N3—Co1	121.1 (2)
C11—C12—H12	120.0	C16—N3—Co1	120.5 (2)
C13—C12—H12	120.0	C21—N4—C25	117.7 (3)
C14—C13—C12	120.7 (4)	C21—N4—Co1	121.2 (2)
C14—C13—H13	119.7	C25—N4—Co1	121.0 (2)
C12—C13—H13	119.7	C30—N5—C26	118.0 (3)
C13—C14—C9	120.7 (4)	C30—N5—Co1	120.1 (2)
C13—C14—H14	119.7	C26—N5—Co1	121.5 (2)
C9—C14—H14	119.7	C7—O1—Co1	109.2 (2)
O3—C15—H15A	109.5	C10—O2—Co1	121.7 (2)
O3—C15—H15B	109.5	C11—O3—C15	117.3 (3)

Table 1

Selected bond lengths (Å)

Co1—O2	1.866 (2)
Co1—N2	1.864 (3)
Co1—O1	1.898 (2)
Co1—N5	1.957 (3)
Co1—N3	1.977 (3)
Co1—N4	1.987 (3)