Bis(2,2′-bipyridyl dioxide-κ2N,N′)bis­(tricyano­methanido)cobalt(II) dihydrate

Qiu, L.-J.; Luo, J.; Zhang, X.-R.; Liu, B.-S.

doi:10.1107/S1600536810017435

metal-organic compounds

CRYSTALLOGRAPHIC
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ISSN: 2056-9890

Volume 66| Part 6| June 2010| Pages m673-m674

https://doi.org/10.1107/S1600536810017435

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Bis(2,2′-bipyridyl dioxide-κ²N,N′)bis(tricyanomethanido)cobalt(II) dihydrate

Li-Juan Qiu,^a Jun Luo,^a ^* Xin-Rong Zhang ^a and Bao-Shu Liu ^a

^aSchool of Pharmacy, Second Military Medical University, Shanghai 200433, People's Republic of China
^*Correspondence e-mail: junluo30@263.net

(Received 28 April 2010; accepted 12 May 2010; online 19 May 2010)

In the title compound, [Co(C₄N₃)₂(C₁₀H₈N₂O₂)]·2H₂O, a novel tricyanomethanide complex, the Co^II atom is located on an inversion center and has a distorted octahedral coordination with two 2,2′-bipyridyl dioxide (dpdo) molecules and two trans tricyanomethanide (tcm) anions. The equatorial plane is formed by the four O atoms of the two chelating dpdo ligands, with one N atom of each of the two tcm ligands occupying an apical position. There is a disordered solvent water molecule in the asymmetric unit (occupancy ratio 0.63:0.37). These water molecules result in the formation of O—H⋯O and O—H⋯N hydrogen bonds, building a layer parallel to (100). The layers are linked by C—H⋯N hydrogen-bonding interactions, leading to a three-dimensional network.

Related literature

For coordination polymers constructed with tricyanomethanide, see: Abrahams et al. (2003 ); Batten & Murray (2003 ); Batten et al. (1998 , 1999 , 2000 ); Feyerherm et al. (2003 , 2004 ); Hoshino et al. (1999 ); Manson & Schlueter (2004 ); Manson et al. (1998 , 2000 ); Miller & Manson (2001 ); Yuste et al. (2007 , 2008 ). For complexes containing dpdo, see: Luo et al. (2009 ); Zhang et al. (2010 ); Su & Lan (2007 ).

Experimental

Crystal data

[Co(C₄N₃)₂(C₁₀H₈N₂O₂)]·2H₂O
M_r = 651.47
Monoclinic, P 2₁ /c
a = 9.575 (3) Å
b = 16.699 (6) Å
c = 9.442 (3) Å
β = 95.307 (4)°
V = 1503.3 (9) Å³
Z = 2
Mo Kα radiation
μ = 0.63 mm⁻¹
T = 293 K
0.15 × 0.12 × 0.10 mm

Data collection

Bruker SMART APEX CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2000 ) T_min = 0.911, T_max = 0.940
7102 measured reflections
3193 independent reflections
2511 reflections with I > 2σ(I)
R_int = 0.026

Refinement

R[F² > 2σ(F²)] = 0.032
wR(F²) = 0.084
S = 0.99
3193 reflections
214 parameters
H-atom parameters constrained
Δρ_max = 0.27 e Å⁻³
Δρ_min = −0.21 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3B⋯O1	0.86	2.00	2.851 (8)	173
O3B—H3D⋯O1	0.86	2.09	2.890 (15)	156
O3—H3A⋯N4ⁱ	0.86	2.24	3.028 (8)	152
O3B—H3C⋯N4ⁱ	0.85	2.21	3.056 (15)	174
C1—H1⋯N4ⁱⁱ	0.93	2.55	3.437 (3)	161
C4—H4⋯N5ⁱⁱⁱ	0.93	2.38	3.287 (3)	165
C10—H10⋯N4^iv	0.93	2.48	3.390 (3)	164
Symmetry codes: (i) $[-x+1, y-{\script{1\over 2}}, -z+{\script{1\over 2}}]$ ; (ii) $[x, -y+{\script{3\over 2}}, z-{\script{1\over 2}}]$ ; (iii) $[x+1, -y+{\script{3\over 2}}, z+{\script{1\over 2}}]$ ; (iv) $[-x+1, y-{\script{1\over 2}}, -z+{\script{3\over 2}}]$ .

Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPIII (Burnett & Johnson, 1996 ), ORTEP-3 for Windows (Farrugia, 1997 ) and PLATON (Spek, 2009 ); software used to prepare material for publication: SHELXL97.

Supporting information

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S1600536810017435/dn2560sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810017435/dn2560Isup2.hkl

checkCIF report

Comment top

Coordination polymers constructed by tricyanomethanide (tcm) have attracted considerable interest due to their diverse structures and fascinating magnetic properties (Batten et al., 2003; Miller et al., 2001; Feyerherm et al., 2003). Notably, except a doubly interpenetrated (6,3) sheet was observed in Ag(tcm)₂ (Abrahams et al., 2003), most binary tcm complexes display a rutile-like structure (Manson et al., 2000, 1998; Hoshino et al., 1999; Feyerherm et al., 2004). To gain insight into the influence of the co-ligands on the structures and magnetic properties of tcm complexes, some co-ligands such as hexamethyl-enetetramine, 4,4-bipyridyl, 1,2-bi(4-pyridyl)ethane were introduced to the binary tcm systems. Among the Cu(I) or Cd(II) tcm complexes with these co-ligands, numerous structure types range from doubly interpenetrated (4,4) sheet to 3D rutile networks were observed (Batten et al., 2000, 1998). By contrast, modification of the Mn(II)-tcm binary system with 4,4-bipyridyl as co-ligands leads to the formation of a one dimensional chain-like structure (Manson et al., 2004). Recently, several copper tcm complexes with nitrogen-containing heterocyclic co-ligands has been characterized (Yuste et al., 2008, 2007). On the other hand, 2,2'-dipyridyl N,N'-dioxide (dpdo) is a new co-ligand and has two potential oxygen donor atoms, however, few tcm complex with dpdo co-ligand has been reported (Luo et al., 2009). During our systematic investigation of the nature of dpdo co-ligand on the structures and properties of tcm complexes, we obtained a new tcm complex Co(dpdo)₂(C₄N₃)₂(H₂O)₂ (I), we herein report the synthesis and crystal structure of the complex.

In the title compound, the cobalt atom, located on an inversion center, has a distorted octahedral geometry with two dpdo molecules and two trans tricyanomethanide. The equatorial plane being formed by the four O atoms of the two chelating dpdo ligands whereas one N atom of each tcm ligands occupying the apical positions (Fig. 1).

Interestingly, two solvate water molecules are observed and the situation is different from the similar manganese complex reported in which no water molecules were found (Luo et al., 2009). In the title compound, these water molecules result in the formation of O-H···O and O-H···N hydrogen bonds building a layer parallel to the (1 0 0) plane (Table 1, Fig. 2). Furthermore, C-H···N hydrogen interactions (Table 1) link these layers forming a three dimensionnal network.

The Co—O(dpdo) distances are in the range 2.050 (1)Å - 2.070 (1) Å, these values are comparable to the corresponding distances in cobalt- nitroxide complexes (Zhang et al., 2010) and in the Co(dpdo)₂(H₂O)₂ (Su & Lan, 2007). The Co—N(tcm) distances are 2.110 (2) Å, and the data are similar to the corresponding distances observed in cobalt tcm complex (Batten et al., 1999).

Each tricyanomethanide moiety is almost planar. Bond distances and bond angles within the anions are in good agreement with those found in other tricyanomethanide complexes (Hoshino et al., 1999; Batten et al., 1999).

Related literature top

For coordination polymers constructed with tricyanomethanide, see: Abrahams et al. (2003); Batten & Murray (2003); Batten et al. (1998, 1999, 2000); Feyerherm et al. (2003, 2004); Hoshino et al. (1999); ; Manson & Schlueter (2004); Manson et al. (1998, 2000); Miller & Manson (2001); Yuste et al. (2007, 2008). For complexes containing dpdo, see: Luo et al. (2009); Zhang et al. (2010); Su & Lan (2007).

Experimental top

A 5 ml warm acetonitrile solution of 2,2'-dipyridyl N,N'-dioxide (0.10 mmol, 18.82 mg) and a 2 ml aqueous red solution of cobalt nitrate (0.10 mmol, 29.10 mg) were mixed and stirred for 5 min s, the mixed solution was orange. To the mixture was added a 3 ml acetonitrile-water solution (CH₃CN:H₂O = 2:1, V:V) of potassium tricyanomethanide (0.20 mmol, 25.83 mg). After stirred for another 5 min s, the orange solution was filtered and the filtrate was slowly evaporated in air. After two weeks, orange block crystals of I were isolated in 34% yield.

Anal: Calculated for C₂₈H₂₀CoN₁₀O₆: C 51.62%, H 3.10%, N 21.50%. Found C 51.77%, H 3.19%, N 21.64%.

Structure description top

For coordination polymers constructed with tricyanomethanide, see: Abrahams et al. (2003); Batten & Murray (2003); Batten et al. (1998, 1999, 2000); Feyerherm et al. (2003, 2004); Hoshino et al. (1999); ; Manson & Schlueter (2004); Manson et al. (1998, 2000); Miller & Manson (2001); Yuste et al. (2007, 2008). For complexes containing dpdo, see: Luo et al. (2009); Zhang et al. (2010); Su & Lan (2007).

Computing details top

Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPIII (Burnett & Johnson, 1996), ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

	Fig. 1. A view of the mononuclear structure in (I), showing the atom- labelling scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms have been omitted for clarity [symmetry code: (i) -x+1, -y+1,-z+1].
	Fig. 2. Partial packing view along the a axis showing the three dimensional structure formed through O-H···O, O-H···N and C-H···N hydrogen bondings. H atoms not involved in hydrogen bondings have been omitted for clarity.

Bis(2,2'-bipyridyl dioxide-κ²N,N')bis(tricyanomethanido)cobalt(II) dihydrate top

Crystal data top

[Co(C₄N₃)₂(C₁₀H₈N₂O₂)]·2H₂O	F(000) = 666
M_r = 651.47	D_x = 1.439 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 887 reflections
a = 9.575 (3) Å	θ = 2.5–26.6°
b = 16.699 (6) Å	µ = 0.63 mm⁻¹
c = 9.442 (3) Å	T = 293 K
β = 95.307 (4)°	Block, orange
V = 1503.3 (9) Å³	0.15 × 0.12 × 0.10 mm
Z = 2

Data collection top

Bruker SMART APEX CCD area-detector diffractometer	3193 independent reflections
Radiation source: fine-focus sealed tube	2511 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.026
phi and ω scans	θ_max = 27.0°, θ_min = 2.1°
Absorption correction: multi-scan (SADABS; Bruker, 2000)	h = −12→7
T_min = 0.911, T_max = 0.940	k = −20→18
7102 measured reflections	l = −8→12

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.032	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.084	H-atom parameters constrained
S = 0.99	w = 1/[σ²(F_o²) + (0.0476P)²] where P = (F_o² + 2F_c²)/3
3193 reflections	(Δ/σ)_max < 0.001
214 parameters	Δρ_max = 0.27 e Å⁻³
0 restraints	Δρ_min = −0.21 e Å⁻³

Crystal data top

[Co(C₄N₃)₂(C₁₀H₈N₂O₂)]·2H₂O	V = 1503.3 (9) Å³
M_r = 651.47	Z = 2
Monoclinic, P2₁/c	Mo Kα radiation
a = 9.575 (3) Å	µ = 0.63 mm⁻¹
b = 16.699 (6) Å	T = 293 K
c = 9.442 (3) Å	0.15 × 0.12 × 0.10 mm
β = 95.307 (4)°

Data collection top

Bruker SMART APEX CCD area-detector diffractometer	3193 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2000)	2511 reflections with I > 2σ(I)
T_min = 0.911, T_max = 0.940	R_int = 0.026
7102 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.032	0 restraints
wR(F²) = 0.084	H-atom parameters constrained
S = 0.99	Δρ_max = 0.27 e Å⁻³
3193 reflections	Δρ_min = −0.21 e Å⁻³
214 parameters

Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Co1	0.5000	0.5000	0.5000	0.03207 (11)
O1	0.63648 (11)	0.55420 (6)	0.37193 (12)	0.0390 (3)
O2	0.60938 (11)	0.55988 (6)	0.66433 (12)	0.0390 (3)
N1	0.64813 (13)	0.63342 (7)	0.38754 (14)	0.0361 (3)
N2	0.74874 (13)	0.55615 (7)	0.67045 (14)	0.0371 (3)
N3	0.36144 (13)	0.59847 (8)	0.48907 (16)	0.0451 (4)
N4	0.3061 (2)	0.85771 (11)	0.5359 (3)	0.0933 (7)
N5	0.0012 (2)	0.71277 (15)	0.2587 (3)	0.1017 (8)
C1	0.57248 (18)	0.68142 (10)	0.29627 (19)	0.0447 (4)
H1	0.5131	0.6595	0.2229	0.054*
C2	0.5829 (2)	0.76308 (11)	0.3113 (2)	0.0519 (5)
H2	0.5295	0.7964	0.2487	0.062*
C3	0.6710 (2)	0.79551 (10)	0.4175 (2)	0.0524 (5)
H3	0.6780	0.8508	0.4283	0.063*
C4	0.74983 (19)	0.74506 (10)	0.5088 (2)	0.0476 (4)
H4	0.8123	0.7664	0.5802	0.057*
C5	0.73654 (16)	0.66330 (9)	0.49468 (18)	0.0374 (4)
C6	0.81807 (16)	0.60621 (9)	0.58911 (18)	0.0394 (4)
C7	0.96264 (18)	0.60478 (12)	0.6027 (2)	0.0591 (5)
H7	1.0118	0.6399	0.5493	0.071*
C8	1.0347 (2)	0.55240 (13)	0.6937 (3)	0.0707 (6)
H8	1.1323	0.5515	0.7019	0.085*
C9	0.9616 (2)	0.50173 (12)	0.7720 (3)	0.0643 (6)
H9	1.0092	0.4653	0.8333	0.077*
C10	0.8172 (2)	0.50427 (9)	0.7606 (2)	0.0494 (5)
H10	0.7673	0.4701	0.8153	0.059*
C11	0.29971 (16)	0.65579 (10)	0.45990 (19)	0.0400 (4)
C12	0.22334 (18)	0.72533 (10)	0.4249 (2)	0.0471 (4)
C13	0.2679 (2)	0.79855 (12)	0.4860 (3)	0.0598 (5)
C14	0.1018 (2)	0.71979 (11)	0.3308 (2)	0.0607 (5)
O3	0.6888 (5)	0.5258 (4)	0.0838 (8)	0.0781 (13)	0.63
H3A	0.6797	0.4749	0.0780	0.117*	0.63
H3B	0.6715	0.5385	0.1685	0.117*	0.63
O3B	0.6196 (10)	0.5240 (9)	0.0694 (16)	0.108 (4)	0.37
H3C	0.6343	0.4776	0.0362	0.162*	0.37
H3D	0.6149	0.5187	0.1591	0.162*	0.37

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Co1	0.03347 (17)	0.02267 (16)	0.03967 (19)	−0.00084 (11)	0.00116 (12)	−0.00023 (12)
O1	0.0486 (6)	0.0276 (5)	0.0414 (6)	−0.0048 (5)	0.0064 (5)	−0.0029 (5)
O2	0.0377 (6)	0.0376 (6)	0.0418 (6)	−0.0045 (5)	0.0037 (5)	−0.0035 (5)
N1	0.0404 (7)	0.0305 (7)	0.0378 (8)	−0.0036 (5)	0.0055 (6)	0.0028 (6)
N2	0.0399 (7)	0.0321 (7)	0.0380 (8)	−0.0036 (6)	−0.0035 (6)	−0.0019 (6)
N3	0.0413 (8)	0.0309 (7)	0.0620 (10)	0.0021 (6)	−0.0015 (7)	−0.0011 (7)
N4	0.1096 (17)	0.0452 (11)	0.1228 (19)	0.0050 (10)	−0.0019 (14)	−0.0175 (12)
N5	0.0858 (15)	0.0982 (16)	0.1116 (19)	0.0178 (12)	−0.0413 (15)	0.0107 (13)
C1	0.0485 (10)	0.0441 (10)	0.0410 (10)	−0.0025 (7)	0.0006 (8)	0.0083 (8)
C2	0.0592 (11)	0.0422 (10)	0.0548 (12)	0.0059 (8)	0.0086 (9)	0.0175 (9)
C3	0.0689 (12)	0.0290 (9)	0.0611 (13)	−0.0025 (8)	0.0147 (10)	0.0080 (8)
C4	0.0546 (11)	0.0361 (9)	0.0522 (11)	−0.0107 (8)	0.0053 (8)	−0.0011 (8)
C5	0.0375 (8)	0.0324 (8)	0.0421 (9)	−0.0057 (6)	0.0030 (7)	0.0019 (7)
C6	0.0389 (9)	0.0327 (8)	0.0457 (10)	−0.0061 (6)	−0.0015 (7)	0.0003 (7)
C7	0.0401 (10)	0.0592 (12)	0.0771 (15)	−0.0072 (9)	0.0000 (9)	0.0098 (11)
C8	0.0439 (11)	0.0753 (15)	0.0897 (17)	0.0017 (10)	−0.0113 (11)	0.0099 (13)
C9	0.0636 (14)	0.0550 (12)	0.0692 (15)	0.0087 (10)	−0.0214 (11)	0.0057 (10)
C10	0.0594 (11)	0.0387 (10)	0.0475 (11)	−0.0013 (8)	−0.0091 (9)	0.0075 (8)
C11	0.0370 (9)	0.0349 (9)	0.0481 (10)	−0.0006 (7)	0.0030 (7)	−0.0011 (7)
C12	0.0464 (10)	0.0353 (9)	0.0590 (12)	0.0099 (7)	0.0019 (9)	0.0029 (8)
C13	0.0659 (13)	0.0389 (11)	0.0748 (15)	0.0136 (9)	0.0073 (11)	−0.0003 (10)
C14	0.0626 (13)	0.0488 (11)	0.0688 (14)	0.0153 (9)	−0.0046 (11)	0.0099 (10)
O3	0.118 (4)	0.0587 (17)	0.058 (2)	0.012 (3)	0.015 (3)	−0.0030 (15)
O3B	0.164 (11)	0.086 (4)	0.075 (5)	0.034 (8)	0.018 (8)	−0.002 (4)

Geometric parameters (Å, º) top

Co1—O2	2.0503 (11)	C4—H4	0.9300
Co1—O2ⁱ	2.0503 (11)	C5—C6	1.478 (2)
Co1—O1	2.0691 (11)	C6—C7	1.378 (2)
Co1—O1ⁱ	2.0691 (11)	C7—C8	1.367 (3)
Co1—N3ⁱ	2.1093 (14)	C7—H7	0.9300
Co1—N3	2.1093 (14)	C8—C9	1.359 (3)
O1—N1	1.3346 (16)	C8—H8	0.9300
O2—N2	1.3318 (16)	C9—C10	1.378 (3)
N1—C1	1.340 (2)	C9—H9	0.9300
N1—C5	1.353 (2)	C10—H10	0.9300
N2—C10	1.342 (2)	C11—C12	1.396 (2)
N2—C6	1.350 (2)	C12—C14	1.400 (3)
N3—C11	1.145 (2)	C12—C13	1.401 (3)
N4—C13	1.140 (3)	O3—H3A	0.8567
N5—C14	1.134 (3)	O3—H3B	0.8584
C1—C2	1.374 (3)	O3—H3C	1.0384
C1—H1	0.9300	O3—H3D	1.0555
C2—C3	1.362 (3)	O3B—H3A	1.0017
C2—H2	0.9300	O3B—H3B	1.0464
C3—C4	1.379 (3)	O3B—H3C	0.8522
C3—H3	0.9300	O3B—H3D	0.8564
C4—C5	1.376 (2)

O2—Co1—O2ⁱ	180.00 (5)	N1—C5—C4	118.94 (15)
O2—Co1—O1	85.58 (5)	N1—C5—C6	118.18 (13)
O2ⁱ—Co1—O1	94.42 (5)	C4—C5—C6	122.86 (15)
O2—Co1—O1ⁱ	94.42 (5)	N2—C6—C7	118.58 (16)
O2ⁱ—Co1—O1ⁱ	85.58 (5)	N2—C6—C5	118.84 (14)
O1—Co1—O1ⁱ	180.00 (5)	C7—C6—C5	122.49 (15)
O2—Co1—N3ⁱ	93.91 (5)	C8—C7—C6	120.92 (19)
O2ⁱ—Co1—N3ⁱ	86.09 (5)	C8—C7—H7	119.5
O1—Co1—N3ⁱ	86.63 (5)	C6—C7—H7	119.5
O1ⁱ—Co1—N3ⁱ	93.37 (5)	C9—C8—C7	118.97 (19)
O2—Co1—N3	86.09 (5)	C9—C8—H8	120.5
O2ⁱ—Co1—N3	93.91 (5)	C7—C8—H8	120.5
O1—Co1—N3	93.37 (5)	C8—C9—C10	120.15 (18)
O1ⁱ—Co1—N3	86.63 (5)	C8—C9—H9	119.9
N3ⁱ—Co1—N3	180.0	C10—C9—H9	119.9
N1—O1—Co1	114.83 (9)	N2—C10—C9	119.79 (17)
N2—O2—Co1	116.72 (9)	N2—C10—H10	120.1
O1—N1—C1	119.17 (13)	C9—C10—H10	120.1
O1—N1—C5	119.23 (12)	N3—C11—C12	179.43 (19)
C1—N1—C5	121.60 (14)	C11—C12—C14	118.80 (16)
O2—N2—C10	119.10 (14)	C11—C12—C13	119.73 (16)
O2—N2—C6	119.31 (12)	C14—C12—C13	121.46 (15)
C10—N2—C6	121.56 (15)	N4—C13—C12	179.0 (2)
C11—N3—Co1	166.34 (15)	N5—C14—C12	176.8 (3)
N1—C1—C2	119.85 (16)	H3A—O3—H3B	106.1
N1—C1—H1	120.1	H3A—O3—H3C	32.7
C2—C1—H1	120.1	H3B—O3—H3C	117.5
C3—C2—C1	120.34 (16)	H3A—O3—H3D	82.0
C3—C2—H2	119.8	H3B—O3—H3D	36.9
C1—C2—H2	119.8	H3C—O3—H3D	82.1
C2—C3—C4	118.89 (17)	H3A—O3B—H3B	84.0
C2—C3—H3	120.6	H3A—O3B—H3C	34.1
C4—C3—H3	120.6	H3B—O3B—H3C	117.3
C5—C4—C3	120.36 (17)	H3A—O3B—H3D	85.3
C5—C4—H4	119.8	H3B—O3B—H3D	37.3
C3—C4—H4	119.8	H3C—O3B—H3D	107.2

Symmetry code: (i) −x+1, −y+1, −z+1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O3—H3B···O1	0.86	2.00	2.851 (8)	173
O3B—H3D···O1	0.86	2.09	2.890 (15)	156
O3—H3A···N4ⁱⁱ	0.86	2.24	3.028 (8)	152
O3B—H3C···N4ⁱⁱ	0.85	2.21	3.056 (15)	174
C1—H1···N4ⁱⁱⁱ	0.93	2.55	3.437 (3)	161
C4—H4···N5^iv	0.93	2.38	3.287 (3)	165
C10—H10···N4^v	0.93	2.48	3.390 (3)	164

Symmetry codes: (ii) −x+1, y−1/2, −z+1/2; (iii) x, −y+3/2, z−1/2; (iv) x+1, −y+3/2, z+1/2; (v) −x+1, y−1/2, −z+3/2.

Experimental details

Crystal data
Chemical formula	[Co(C₄N₃)₂(C₁₀H₈N₂O₂)]·2H₂O
M_r	651.47
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	293
a, b, c (Å)	9.575 (3), 16.699 (6), 9.442 (3)
β (°)	95.307 (4)
V (Å³)	1503.3 (9)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.63
Crystal size (mm)	0.15 × 0.12 × 0.10

Data collection
Diffractometer	Bruker SMART APEX CCD area-detector
Absorption correction	Multi-scan (SADABS; Bruker, 2000)
T_min, T_max	0.911, 0.940
No. of measured, independent and observed [I > 2σ(I)] reflections	7102, 3193, 2511
R_int	0.026
(sin θ/λ)_max (Å⁻¹)	0.639

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.032, 0.084, 0.99
No. of reflections	3193
No. of parameters	214
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.27, −0.21

Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEPIII (Burnett & Johnson, 1996), ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O3—H3B···O1	0.86	2.00	2.851 (8)	173.0
O3B—H3D···O1	0.86	2.09	2.890 (15)	155.9
O3—H3A···N4ⁱ	0.86	2.24	3.028 (8)	152.4
O3B—H3C···N4ⁱ	0.85	2.21	3.056 (15)	173.9
C1—H1···N4ⁱⁱ	0.93	2.55	3.437 (3)	160.9
C4—H4···N5ⁱⁱⁱ	0.93	2.38	3.287 (3)	164.8
C10—H10···N4^iv	0.93	2.48	3.390 (3)	164.4

Symmetry codes: (i) −x+1, y−1/2, −z+1/2; (ii) x, −y+3/2, z−1/2; (iii) x+1, −y+3/2, z+1/2; (iv) −x+1, y−1/2, −z+3/2.

Acknowledgements

This project was supported by the National Natural Science Foundation of China (20571086).

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