metal-organic compounds
Redetermination of cis-bis(ethylenediamine-κ2N,N′)bis(nitrito-κN)cobalt(III) (ethylenediamine-κ2N,N′)tetrakis(nitrito-κN)cobaltate(III) monohydrate
aLaboratório de Materiais Inorgânicos, Universidade Federal de Santa Maria, 97105–900 Santa Maria, RS, Brazil
*Correspondence e-mail: rburrow@ewald.base.ufsm.br
The structure of the title compound, [Co(NO2)2(NH2CH2CH2NH2)2][Co(NO2)4(NH2CH2CH2NH2)]·H2O, was redetermined with a modern CCD-equipped diffractometer. In comparison with the original determination based on photographic data [Kushi et al. (1976). Inorg. Nucl. Chem. Lett. 12, 629–633], the current study allows the location of reliable postions for the H atoms and thus leads to better understanding of the interionic and intermolecular interactions. The consists of an octahedrally coordinated cationic CoIII complex ion, an octahedrally coordinated anionic CoIII complex ion and a lattice water molecule. The complex cation, complex anion and lattice water molecule are connected by an intricate network of O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional structure.
Related literature
For background to CoIII complexes, see: Angelici (1969); Bernal (1985); Bernal & Kauffman (1987); Murmann (1955). For a previous report of the of the title compound, see: Kushi et al. (1976). For synthetic details, see: Bailor & Rollinson (1946); Sharrock (1980). For a description of the Cambridge Structural Database, see: Allen (2002).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2012); cell SAINT (Bruker, 2012); 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, 2009); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S1600536812050325/wm2706sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812050325/wm2706Isup2.hkl
The title compound was synthesized via the chloride, prepared following the procedure of Bailor & Rollinson (1946) with the hydrogen peroxide oxidation modification of Sharrock (1980), followed by subsitution of of the chloride ligand by nitrito ligand (Bernal, 1985). Yellow crystals suitable for single-crystal X ray diffraction were formed by slow evaporation of the reaction mixture as room temperature.
The H atoms on N atoms and in the lattice water molecule were found in a difference Fourier map and their positions allowed to refine freely while isotropic displacement factors were set to 1.2 times those of the N atoms or to 1.5 of that the O atom. The H atoms on the ethylene C atoms were positioned geometrically and allowed to ride on their parent atoms, with C—H bond lengths of 0.99 Å and isotropic displacement parameters equal to 1.2 times Ueq of the parent atom.
Cobalt(III) complexes are classical examples in undergraduate inorganic experimental laboratories due to their ease of preparation and great stability (Angelici, 1969). The ethylenediamine complex cis-[bis(ethylenediamine-kN,N')dinitrito-κ-N-cobalt(III)] chloride is of particular interest due to its upon crystallization (Murmann, 1955; Bernal, 1985; Bernal & Kauffman, 1987). In an attempt to synthesize this compound, crystals of the title compound cis-[Co(NH2CH2CH2NH2)2(NO2)2] [Co(NH2CH2CH2NH2)(NO2)4].H2O, (I), were obtained instead.
Although the θ.
of the compound (I) has been determined previously from visually estimated photographic data (Kushi et al., 1976), it is of rather low quality (R = 0.13) compared to today's standard, and more importantly the extensive hydrogen bonding was not noted, in part due to the inability to locate the H atoms of the water molecule. In addition, the atomic coordinates have not been deposited with the Cambridge Structure Database (CSD; Allen, 2002) and hence are not available in the public domain. We report here the redetermination of the at 100 K with data measured up to 30 ° inThe Λ isomers of the complex cation, the complex anion and a lattice water molecule. In the complex cation, the two ethylenediamine ligands chelate to the CoIII ion, and the nitrito ligands bond via their N atoms to form an approximate octahedral coordination geometry. The complex anion is similar, with one ethylenediamine ligand and four nitrito ligands bonded to the central metal cation. The Co—N distances to the ethylenediamine ligands are similar in the two ion complexes, varying between 1.9141 (17) Å and 1.9811 (17) Å. This range is within the distribution for similar complexes with octahedrally coordinated Co(III) found in the CSD (Allen, 2002; version 5.33 as of November, 2011 with Feb., 2011, Mar., 2012 & May, 2012 updates], viz 1.97 (2) Å for 756 distances. There is a slight trans influence in the the cation complex where the Co—N distance is marginally longer (by ca 0.02 Å) for the N atoms trans to the nitrito ligands. The Co—N distances for the nitrito ligands show a larger variation with shorter distances in the complex cation, 1.9141 (17) & 1.9177 (16) Å, than those in the complex anion. The latter shows a stronger trans influence with the Co—N distances trans to the N atoms of the nitrito ligands longer (1.9413 (17) & 1.9502 (16) Å) than the Co—N distance trans to the ethylenediamine ligand (1.9215 (17) & 1.9240 (17) Å).
of (I) is centrossymmetric with a of the Δ andThe packing diagram (Fig. 2), shows alternating columns of complex cations and anions in the crystallographic a direction. The lattice water molecule is located between the complex cation and anion. There is an intricate three-dimensional network of hydrogen bonding interactions between the NH2 groups and O atoms of nitrito ligands of neighboring ions and also of the lattice water molecule, which forms hydrogen bonds to four complex anions (Fig. 3; Table 1).
For background to CoIII complexes, see: Angelici (1969); Bernal (1985); Bernal & Kauffman (1987); Murmann (1955). For a previous report of the
of the title compound, see: Kushi et al. (1976). For synthetic details, see: Bailor & Rollinson (1946); Sharrock (1980). For a description of the Cambridge Structural Database, see: Allen (2002).Data collection: APEX2 (Bruker, 2012); cell
SAINT (Bruker, 2012); data reduction: SAINT (Bruker, 2012); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2009); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. The molecular structure of (I), with 50% probability ellipsoids, showing the atomic numbering scheme. | |
Fig. 2. The packing diagram of (I) projected along the b axis. | |
Fig. 3. The hydrogen bonding interactions in the crystal structure of (I) shown as dashed red lines. [Symmetry codes: (i) -x + 3/2, y - 1/2, -z + 1/2; (ii) -x + 1, -y, -z; (iii) x, y - 1, z; (iv) -x + 1, -y + 1, -z; (v) -x + 3/2, y + 1/2, -z + 1/2; (vi) x + 1, y, z; (vii) -x + 1/2, 320 y + 1/2, -z + 1/2; (viii) x, y + 1, z; (ix) x - 1, y, z; (x) -x + 1/2, y - 1/2, -z + 1/2.] |
[Co(NO2)2(C2H8N2)2][Co(NO2)4(C2H8N2)]·H2O | F(000) = 1216 |
Mr = 592.25 | Dx = 1.936 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
a = 14.7580 (5) Å | Cell parameters from 7429 reflections |
b = 6.7060 (2) Å | θ = 2.8–30.0° |
c = 20.6845 (7) Å | µ = 1.73 mm−1 |
β = 96.969 (2)° | T = 100 K |
V = 2031.96 (11) Å3 | Plate, light yellow |
Z = 4 | 0.40 × 0.15 × 0.05 mm |
Bruker X8 Kappa APEXII diffractometer | 6280 independent reflections |
Radiation source: sealed ceramic X ray tube, Siemens KFF | 4801 reflections with I > 2σ(I) |
Graphite crystal monochromator | Rint = 0.073 |
Detector resolution: 8.3333 pixels mm-1 | θmax = 30.7°, θmin = 2.8° |
0.5 ° ω & φ scans | h = −21→21 |
Absorption correction: numerical (SADABS; Bruker, 2012) | k = −9→9 |
Tmin = 0.692, Tmax = 0.925 | l = −29→29 |
63576 measured reflections |
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)] = 0.035 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.087 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0384P)2 + 0.7699P] where P = (Fo2 + 2Fc2)/3 |
6280 reflections | (Δ/σ)max < 0.001 |
340 parameters | Δρmax = 0.72 e Å−3 |
0 restraints | Δρmin = −0.84 e Å−3 |
[Co(NO2)2(C2H8N2)2][Co(NO2)4(C2H8N2)]·H2O | V = 2031.96 (11) Å3 |
Mr = 592.25 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 14.7580 (5) Å | µ = 1.73 mm−1 |
b = 6.7060 (2) Å | T = 100 K |
c = 20.6845 (7) Å | 0.40 × 0.15 × 0.05 mm |
β = 96.969 (2)° |
Bruker X8 Kappa APEXII diffractometer | 6280 independent reflections |
Absorption correction: numerical (SADABS; Bruker, 2012) | 4801 reflections with I > 2σ(I) |
Tmin = 0.692, Tmax = 0.925 | Rint = 0.073 |
63576 measured reflections |
R[F2 > 2σ(F2)] = 0.035 | 0 restraints |
wR(F2) = 0.087 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | Δρmax = 0.72 e Å−3 |
6280 reflections | Δρmin = −0.84 e Å−3 |
340 parameters |
Experimental. The data collection was performed under a cold nitritogen flow at 100 K. |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 | ||
Co1 | 0.843849 (18) | 0.27327 (4) | 0.14261 (12) | 0.00806 (7) | |
N11 | 0.77135 (12) | 0.0306 (3) | 0.11765 (9) | 0.0119 (3) | |
H11A | 0.7676 (16) | −0.041 (4) | 0.1502 (12) | 0.018* | |
H11B | 0.7919 (17) | −0.035 (4) | 0.0915 (12) | 0.018* | |
N12 | 0.72646 (12) | 0.4084 (3) | 0.13789 (9) | 0.0118 (3) | |
H12A | 0.7131 (16) | 0.487 (4) | 0.1049 (12) | 0.018* | |
H12B | 0.7233 (17) | 0.484 (4) | 0.1675 (13) | 0.018* | |
C11 | 0.67584 (13) | 0.0895 (3) | 0.09310 (10) | 0.0151 (4) | |
H11C | 0.6338 | −0.0243 | 0.096 | 0.018* | |
H11D | 0.6718 | 0.1326 | 0.0471 | 0.018* | |
C12 | 0.65116 (14) | 0.2597 (3) | 0.13567 (10) | 0.0147 (4) | |
H12C | 0.5926 | 0.3207 | 0.1172 | 0.018* | |
H12D | 0.6448 | 0.2109 | 0.1801 | 0.018* | |
N13 | 0.95848 (12) | 0.1259 (3) | 0.14299 (8) | 0.0112 (3) | |
H13A | 0.9998 (17) | 0.194 (4) | 0.1646 (12) | 0.017* | |
H13B | 0.9546 (16) | 0.009 (4) | 0.1610 (12) | 0.017* | |
N14 | 0.85766 (12) | 0.3359 (3) | 0.05090 (8) | 0.0112 (3) | |
H14A | 0.8164 (18) | 0.268 (3) | 0.0203 (12) | 0.017* | |
H14B | 0.8437 (16) | 0.459 (4) | 0.0468 (12) | 0.017* | |
C13 | 0.98149 (14) | 0.1016 (3) | 0.07545 (9) | 0.0121 (4) | |
H13C | 0.9484 | −0.0139 | 0.0542 | 0.015* | |
H13D | 1.0479 | 0.079 | 0.0759 | 0.015* | |
C14 | 0.95313 (14) | 0.2919 (3) | 0.03914 (10) | 0.0135 (4) | |
H14C | 0.994 | 0.4029 | 0.0552 | 0.016* | |
H14D | 0.9565 | 0.2746 | −0.008 | 0.016* | |
N15 | 0.83969 (11) | 0.2115 (2) | 0.23255 (8) | 0.0114 (3) | |
O11 | 0.79655 (11) | 0.3185 (2) | 0.26709 (7) | 0.0223 (3) | |
O12 | 0.88006 (10) | 0.0626 (2) | 0.25612 (7) | 0.0182 (3) | |
N16 | 0.91005 (11) | 0.5117 (2) | 0.16892 (8) | 0.0121 (3) | |
O13 | 0.88884 (11) | 0.6728 (2) | 0.14137 (7) | 0.0195 (3) | |
O14 | 0.97386 (10) | 0.5019 (2) | 0.21304 (7) | 0.0198 (3) | |
Co2 | 0.300637 (18) | 0.21539 (4) | 0.116445 (12) | 0.00813 (7) | |
N21 | 0.34669 (12) | 0.1925 (2) | 0.20883 (8) | 0.0100 (3) | |
H21A | 0.3033 (18) | 0.207 (4) | 0.2293 (12) | 0.015* | |
H21B | 0.3695 (16) | 0.076 (4) | 0.2176 (11) | 0.015* | |
N22 | 0.35638 (12) | 0.4797 (2) | 0.12156 (8) | 0.0112 (3) | |
H22A | 0.3196 (17) | 0.563 (4) | 0.1050 (12) | 0.017* | |
H22B | 0.4061 (17) | 0.477 (4) | 0.1013 (11) | 0.017* | |
C21 | 0.41547 (14) | 0.3501 (3) | 0.22704 (10) | 0.0127 (4) | |
H21C | 0.4755 | 0.3103 | 0.2145 | 0.015* | |
H21D | 0.4222 | 0.3735 | 0.2746 | 0.015* | |
C22 | 0.38153 (14) | 0.5361 (3) | 0.19102 (9) | 0.0134 (4) | |
H22C | 0.3277 | 0.59 | 0.2094 | 0.016* | |
H22D | 0.4299 | 0.6393 | 0.1948 | 0.016* | |
N23 | 0.18840 (11) | 0.3367 (2) | 0.13875 (8) | 0.0116 (3) | |
O21 | 0.14792 (10) | 0.4608 (2) | 0.10178 (7) | 0.0159 (3) | |
O22 | 0.15768 (11) | 0.2921 (2) | 0.19042 (7) | 0.0191 (3) | |
N24 | 0.25641 (12) | 0.2582 (2) | 0.02614 (8) | 0.0117 (3) | |
O23 | 0.18335 (10) | 0.1818 (2) | 0.00146 (7) | 0.0176 (3) | |
O24 | 0.29753 (10) | 0.3733 (2) | −0.00703 (7) | 0.0167 (3) | |
N25 | 0.41370 (11) | 0.0952 (2) | 0.09661 (8) | 0.0114 (3) | |
O25 | 0.44644 (10) | −0.0461 (2) | 0.13136 (7) | 0.0180 (3) | |
O26 | 0.45432 (10) | 0.1533 (2) | 0.05169 (7) | 0.0186 (3) | |
N26 | 0.25080 (11) | −0.0494 (2) | 0.11586 (8) | 0.0130 (3) | |
O27 | 0.25612 (10) | −0.1596 (2) | 0.06758 (7) | 0.0172 (3) | |
O28 | 0.22021 (11) | −0.1164 (2) | 0.16421 (7) | 0.0201 (3) | |
O1 | 0.52233 (12) | 0.6237 (2) | 0.06827 (8) | 0.0216 (3) | |
H1A | 0.5386 (19) | 0.649 (4) | 0.0315 (14) | 0.032* | |
H1B | 0.511 (2) | 0.731 (4) | 0.0847 (15) | 0.032* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Co1 | 0.00877 (13) | 0.00827 (12) | 0.00724 (13) | 0.00044 (9) | 0.00131 (9) | −0.00040 (9) |
N11 | 0.0140 (9) | 0.0097 (8) | 0.0128 (8) | −0.0006 (6) | 0.0045 (7) | −0.0011 (6) |
N12 | 0.0121 (8) | 0.0131 (8) | 0.0104 (8) | 0.0025 (6) | 0.0013 (6) | −0.0011 (6) |
C11 | 0.0100 (9) | 0.0163 (10) | 0.0190 (10) | −0.0008 (7) | 0.0008 (8) | −0.0046 (8) |
C12 | 0.0114 (10) | 0.0156 (10) | 0.0177 (10) | −0.0004 (7) | 0.0042 (8) | −0.0025 (7) |
N13 | 0.0100 (8) | 0.0123 (8) | 0.0108 (8) | 0.0016 (6) | −0.0007 (6) | −0.0006 (6) |
N14 | 0.0121 (8) | 0.0118 (8) | 0.0099 (8) | 0.0007 (6) | 0.0023 (6) | 0.0013 (6) |
C13 | 0.0107 (9) | 0.0137 (9) | 0.0122 (9) | −0.0001 (7) | 0.0026 (7) | −0.0021 (7) |
C14 | 0.0140 (10) | 0.0143 (9) | 0.0130 (9) | −0.0004 (7) | 0.0045 (8) | 0.0000 (7) |
N15 | 0.0098 (8) | 0.0138 (8) | 0.0106 (8) | −0.0001 (6) | 0.0015 (6) | −0.0001 (6) |
O11 | 0.0270 (9) | 0.0296 (9) | 0.0117 (7) | 0.0126 (7) | 0.0076 (6) | −0.0005 (6) |
O12 | 0.0220 (8) | 0.0173 (7) | 0.0152 (7) | 0.0047 (6) | 0.0021 (6) | 0.0068 (6) |
N16 | 0.0129 (8) | 0.0124 (8) | 0.0111 (8) | −0.0001 (6) | 0.0018 (6) | −0.0023 (6) |
O13 | 0.0266 (9) | 0.0096 (7) | 0.0215 (8) | 0.0006 (6) | 0.0003 (6) | 0.0032 (6) |
O14 | 0.0183 (8) | 0.0192 (8) | 0.0195 (8) | −0.0024 (6) | −0.0076 (6) | −0.0027 (6) |
Co2 | 0.00897 (13) | 0.00782 (12) | 0.00761 (13) | −0.00003 (9) | 0.00110 (9) | 0.00019 (9) |
N21 | 0.0111 (8) | 0.0100 (8) | 0.0091 (8) | 0.0008 (6) | 0.0016 (6) | 0.0010 (6) |
N22 | 0.0118 (8) | 0.0093 (8) | 0.0128 (8) | 0.0016 (6) | 0.0025 (7) | 0.0010 (6) |
C21 | 0.0128 (10) | 0.0122 (9) | 0.0123 (9) | −0.0020 (7) | −0.0013 (7) | 0.0000 (7) |
C22 | 0.0166 (10) | 0.0117 (9) | 0.0118 (9) | −0.0011 (7) | 0.0010 (8) | −0.0034 (7) |
N23 | 0.0089 (8) | 0.0116 (8) | 0.0141 (8) | −0.0014 (6) | 0.0012 (6) | −0.0014 (6) |
O21 | 0.0160 (7) | 0.0135 (7) | 0.0179 (7) | 0.0043 (6) | 0.0001 (6) | 0.0022 (6) |
O22 | 0.0174 (8) | 0.0271 (8) | 0.0143 (7) | 0.0045 (6) | 0.0077 (6) | 0.0043 (6) |
N24 | 0.0137 (8) | 0.0123 (8) | 0.0094 (8) | 0.0022 (6) | 0.0020 (6) | −0.0006 (6) |
O23 | 0.0141 (7) | 0.0230 (8) | 0.0146 (7) | −0.0013 (6) | −0.0019 (6) | −0.0029 (6) |
O24 | 0.0182 (8) | 0.0199 (7) | 0.0124 (7) | 0.0016 (6) | 0.0038 (6) | 0.0058 (6) |
N25 | 0.0127 (8) | 0.0097 (7) | 0.0115 (8) | −0.0014 (6) | 0.0003 (6) | −0.0019 (6) |
O25 | 0.0209 (8) | 0.0145 (7) | 0.0192 (8) | 0.0079 (6) | 0.0045 (6) | 0.0053 (6) |
O26 | 0.0168 (8) | 0.0231 (8) | 0.0172 (8) | 0.0036 (6) | 0.0076 (6) | 0.0047 (6) |
N26 | 0.0109 (8) | 0.0123 (8) | 0.0152 (8) | −0.0003 (6) | −0.0014 (6) | −0.0004 (6) |
O27 | 0.0211 (8) | 0.0130 (7) | 0.0168 (7) | −0.0019 (6) | −0.0007 (6) | −0.0057 (6) |
O28 | 0.0257 (8) | 0.0172 (8) | 0.0185 (8) | −0.0058 (6) | 0.0066 (6) | 0.0031 (6) |
O1 | 0.0287 (9) | 0.0147 (8) | 0.0240 (9) | 0.0005 (7) | 0.0139 (7) | 0.0016 (6) |
Co1—N15 | 1.9141 (17) | N16—O14 | 1.231 (2) |
Co1—N16 | 1.9177 (16) | N16—O13 | 1.244 (2) |
Co1—N12 | 1.9471 (17) | Co2—N26 | 1.9215 (17) |
Co1—N13 | 1.9586 (17) | Co2—N24 | 1.9240 (17) |
Co1—N14 | 1.9775 (17) | Co2—N25 | 1.9413 (17) |
Co1—N11 | 1.9811 (17) | Co2—N23 | 1.9502 (16) |
N11—C11 | 1.492 (3) | Co2—N22 | 1.9512 (17) |
N11—H11A | 0.83 (3) | Co2—N21 | 1.9551 (17) |
N11—H11B | 0.79 (3) | N21—C21 | 1.482 (3) |
N12—C12 | 1.490 (3) | N21—H21A | 0.82 (3) |
N12—H12A | 0.86 (3) | N21—H21B | 0.86 (2) |
N12—H12B | 0.80 (3) | N22—C22 | 1.489 (2) |
C11—C12 | 1.513 (3) | N22—H22A | 0.83 (2) |
C11—H11C | 0.99 | N22—H22B | 0.89 (2) |
C11—H11D | 0.99 | C21—C22 | 1.507 (3) |
C12—H12C | 0.99 | C21—H21C | 0.99 |
C12—H12D | 0.99 | C21—H21D | 0.99 |
N13—C13 | 1.486 (2) | C22—H22C | 0.99 |
N13—H13A | 0.84 (3) | C22—H22D | 0.99 |
N13—H13B | 0.87 (3) | N23—O21 | 1.234 (2) |
N14—C14 | 1.488 (3) | N23—O22 | 1.247 (2) |
N14—H14A | 0.94 (3) | N24—O24 | 1.239 (2) |
N14—H14B | 0.85 (2) | N24—O23 | 1.246 (2) |
C13—C14 | 1.514 (3) | N25—O26 | 1.229 (2) |
C13—H13C | 0.99 | N25—O25 | 1.250 (2) |
C13—H13D | 0.99 | N26—O28 | 1.231 (2) |
C14—H14C | 0.99 | N26—O27 | 1.252 (2) |
C14—H14D | 0.99 | O1—H1A | 0.84 (3) |
N15—O12 | 1.233 (2) | O1—H1B | 0.82 (3) |
N15—O11 | 1.241 (2) | ||
N15—Co1—N16 | 88.84 (7) | C13—C14—H14D | 110.3 |
N15—Co1—N12 | 90.93 (7) | H14C—C14—H14D | 108.5 |
N16—Co1—N12 | 92.62 (7) | O12—N15—O11 | 119.85 (17) |
N15—Co1—N13 | 90.95 (7) | O12—N15—Co1 | 119.25 (13) |
N16—Co1—N13 | 90.55 (7) | O11—N15—Co1 | 120.90 (13) |
N12—Co1—N13 | 176.35 (7) | O14—N16—O13 | 120.87 (17) |
N15—Co1—N14 | 175.95 (7) | O14—N16—Co1 | 118.93 (13) |
N16—Co1—N14 | 89.24 (7) | O13—N16—Co1 | 120.20 (13) |
N12—Co1—N14 | 92.73 (7) | N26—Co2—N24 | 92.70 (7) |
N13—Co1—N14 | 85.50 (7) | N26—Co2—N25 | 87.31 (7) |
N15—Co1—N11 | 89.76 (7) | N24—Co2—N25 | 93.20 (7) |
N16—Co1—N11 | 177.57 (7) | N26—Co2—N23 | 92.95 (7) |
N12—Co1—N11 | 85.42 (7) | N24—Co2—N23 | 88.26 (7) |
N13—Co1—N11 | 91.46 (7) | N25—Co2—N23 | 178.50 (7) |
N14—Co1—N11 | 92.28 (7) | N26—Co2—N22 | 176.56 (7) |
C11—N11—Co1 | 109.24 (12) | N24—Co2—N22 | 90.48 (7) |
C11—N11—H11A | 105.9 (17) | N25—Co2—N22 | 91.21 (7) |
Co1—N11—H11A | 110.3 (17) | N23—Co2—N22 | 88.45 (7) |
C11—N11—H11B | 109.9 (18) | N26—Co2—N21 | 91.20 (7) |
Co1—N11—H11B | 113.5 (18) | N24—Co2—N21 | 175.92 (7) |
H11A—N11—H11B | 108 (2) | N25—Co2—N21 | 88.17 (7) |
C12—N12—Co1 | 110.22 (13) | N23—Co2—N21 | 90.34 (7) |
C12—N12—H12A | 106.5 (16) | N22—Co2—N21 | 85.65 (7) |
Co1—N12—H12A | 116.0 (17) | C21—N21—Co2 | 109.77 (12) |
C12—N12—H12B | 109.5 (18) | C21—N21—H21A | 109.7 (17) |
Co1—N12—H12B | 113.0 (18) | Co2—N21—H21A | 107.2 (18) |
H12A—N12—H12B | 101 (2) | C21—N21—H21B | 110.9 (15) |
N11—C11—C12 | 106.59 (16) | Co2—N21—H21B | 110.9 (15) |
N11—C11—H11C | 110.4 | H21A—N21—H21B | 108 (2) |
C12—C11—H11C | 110.4 | C22—N22—Co2 | 109.71 (12) |
N11—C11—H11D | 110.4 | C22—N22—H22A | 107.6 (17) |
C12—C11—H11D | 110.4 | Co2—N22—H22A | 110.1 (17) |
H11C—C11—H11D | 108.6 | C22—N22—H22B | 109.7 (15) |
N12—C12—C11 | 106.97 (17) | Co2—N22—H22B | 108.8 (16) |
N12—C12—H12C | 110.3 | H22A—N22—H22B | 111 (2) |
C11—C12—H12C | 110.3 | N21—C21—C22 | 106.76 (15) |
N12—C12—H12D | 110.3 | N21—C21—H21C | 110.4 |
C11—C12—H12D | 110.3 | C22—C21—H21C | 110.4 |
H12C—C12—H12D | 108.6 | N21—C21—H21D | 110.4 |
C13—N13—Co1 | 110.33 (12) | C22—C21—H21D | 110.4 |
C13—N13—H13A | 108.9 (17) | H21C—C21—H21D | 108.6 |
Co1—N13—H13A | 107.4 (17) | N22—C22—C21 | 107.21 (15) |
C13—N13—H13B | 109.6 (16) | N22—C22—H22C | 110.3 |
Co1—N13—H13B | 110.8 (16) | C21—C22—H22C | 110.3 |
H13A—N13—H13B | 110 (2) | N22—C22—H22D | 110.3 |
C14—N14—Co1 | 108.93 (12) | C21—C22—H22D | 110.3 |
C14—N14—H14A | 110.0 (16) | H22C—C22—H22D | 108.5 |
Co1—N14—H14A | 114.1 (15) | O21—N23—O22 | 119.58 (16) |
C14—N14—H14B | 113.5 (17) | O21—N23—Co2 | 119.71 (13) |
Co1—N14—H14B | 104.5 (16) | O22—N23—Co2 | 120.69 (13) |
H14A—N14—H14B | 106 (2) | O24—N24—O23 | 119.14 (16) |
N13—C13—C14 | 107.04 (15) | O24—N24—Co2 | 119.94 (13) |
N13—C13—H13C | 110.3 | O23—N24—Co2 | 120.75 (13) |
C14—C13—H13C | 110.3 | O26—N25—O25 | 119.03 (16) |
N13—C13—H13D | 110.3 | O26—N25—Co2 | 122.59 (13) |
C14—C13—H13D | 110.3 | O25—N25—Co2 | 118.38 (13) |
H13C—C13—H13D | 108.6 | O28—N26—O27 | 119.82 (17) |
N14—C14—C13 | 107.25 (16) | O28—N26—Co2 | 120.66 (13) |
N14—C14—H14C | 110.3 | O27—N26—Co2 | 119.29 (14) |
C13—C14—H14C | 110.3 | H1A—O1—H1B | 107 (3) |
N14—C14—H14D | 110.3 | ||
N15—Co1—N11—C11 | 105.28 (14) | N22—Co2—N21—C21 | −14.82 (13) |
N12—Co1—N11—C11 | 14.33 (14) | N24—Co2—N22—C22 | 165.62 (13) |
N13—Co1—N11—C11 | −163.77 (14) | N25—Co2—N22—C22 | −101.17 (13) |
N14—Co1—N11—C11 | −78.22 (14) | N23—Co2—N22—C22 | 77.37 (13) |
N15—Co1—N12—C12 | −75.67 (14) | N21—Co2—N22—C22 | −13.09 (13) |
N16—Co1—N12—C12 | −164.55 (14) | Co2—N21—C21—C22 | 38.90 (18) |
N14—Co1—N12—C12 | 106.08 (14) | Co2—N22—C22—C21 | 37.65 (18) |
N11—Co1—N12—C12 | 14.01 (14) | N26—Co2—N23—O21 | −120.29 (15) |
Co1—N11—C11—C12 | −38.82 (19) | N24—Co2—N23—O21 | −27.67 (15) |
Co1—N12—C12—C11 | −38.91 (19) | N22—Co2—N23—O21 | 62.86 (15) |
N15—Co1—N13—C13 | 169.58 (13) | N21—Co2—N23—O21 | 148.49 (15) |
N16—Co1—N13—C13 | −101.57 (13) | N26—Co2—N23—O22 | 60.64 (16) |
N14—Co1—N13—C13 | −12.38 (13) | N24—Co2—N23—O22 | 153.25 (16) |
N11—Co1—N13—C13 | 79.80 (13) | N22—Co2—N23—O22 | −116.22 (16) |
N16—Co1—N14—C14 | 75.08 (13) | N21—Co2—N23—O22 | −30.58 (16) |
N12—Co1—N14—C14 | 167.66 (13) | N26—Co2—N24—O24 | −151.60 (15) |
N13—Co1—N14—C14 | −15.54 (13) | N25—Co2—N24—O24 | −64.15 (15) |
N11—Co1—N14—C14 | −106.82 (13) | N23—Co2—N24—O24 | 115.53 (15) |
Co1—N13—C13—C14 | 37.01 (18) | N22—Co2—N24—O24 | 27.10 (15) |
Co1—N14—C14—C13 | 39.52 (18) | N26—Co2—N24—O23 | 33.20 (15) |
N16—Co1—N15—O12 | −114.95 (15) | N25—Co2—N24—O23 | 120.65 (15) |
N12—Co1—N15—O12 | 152.45 (15) | N23—Co2—N24—O23 | −59.66 (15) |
N13—Co1—N15—O12 | −24.42 (15) | N22—Co2—N24—O23 | −148.10 (15) |
N11—Co1—N15—O12 | 67.03 (15) | N26—Co2—N25—O26 | 129.51 (16) |
N16—Co1—N15—O11 | 65.51 (16) | N24—Co2—N25—O26 | 36.95 (16) |
N12—Co1—N15—O11 | −27.09 (16) | N22—Co2—N25—O26 | −53.60 (16) |
N13—Co1—N15—O11 | 156.04 (16) | N21—Co2—N25—O26 | −139.21 (16) |
N11—Co1—N15—O11 | −112.51 (16) | N26—Co2—N25—O25 | −50.98 (14) |
N15—Co1—N16—O14 | 45.77 (15) | N24—Co2—N25—O25 | −143.54 (14) |
N12—Co1—N16—O14 | 136.64 (15) | N22—Co2—N25—O25 | 125.91 (14) |
N13—Co1—N16—O14 | −45.17 (15) | N21—Co2—N25—O25 | 40.30 (14) |
N14—Co1—N16—O14 | −130.66 (15) | N24—Co2—N26—O28 | −145.07 (15) |
N15—Co1—N16—O13 | −134.66 (15) | N25—Co2—N26—O28 | 121.85 (15) |
N12—Co1—N16—O13 | −43.78 (16) | N23—Co2—N26—O28 | −56.67 (15) |
N13—Co1—N16—O13 | 134.40 (15) | N21—Co2—N26—O28 | 33.73 (16) |
N14—Co1—N16—O13 | 48.91 (15) | N24—Co2—N26—O27 | 40.49 (15) |
N26—Co2—N21—C21 | 163.81 (13) | N25—Co2—N26—O27 | −52.59 (15) |
N25—Co2—N21—C21 | 76.54 (13) | N23—Co2—N26—O27 | 128.89 (15) |
N23—Co2—N21—C21 | −103.24 (13) | N21—Co2—N26—O27 | −140.70 (15) |
D—H···A | D—H | H···A | D···A | D—H···A |
N11—H11A···O11i | 0.83 (3) | 2.26 (3) | 3.048 (2) | 158 (2) |
N11—H11B···O23ii | 0.79 (3) | 2.23 (3) | 2.991 (2) | 163 (2) |
N11—H11B···O13iii | 0.79 (3) | 2.57 (2) | 2.966 (2) | 113 (2) |
N12—H12A···O24iv | 0.86 (3) | 2.22 (3) | 3.060 (2) | 164 (2) |
N12—H12B···O12v | 0.80 (3) | 2.38 (3) | 3.030 (2) | 139 (2) |
N13—H13A···O22vi | 0.84 (3) | 2.42 (3) | 3.186 (2) | 152 (2) |
N13—H13B···O13iii | 0.87 (3) | 2.47 (3) | 3.206 (2) | 143 (2) |
N14—H14A···O27ii | 0.94 (3) | 2.12 (3) | 3.038 (2) | 164 (2) |
N14—H14B···O24iv | 0.85 (2) | 2.42 (2) | 3.060 (2) | 132 (2) |
N21—H21A···O28vii | 0.82 (3) | 2.56 (3) | 3.185 (2) | 134 (2) |
N22—H22A···O27viii | 0.83 (2) | 2.18 (3) | 2.981 (2) | 164 (2) |
N22—H22B···O1 | 0.89 (2) | 2.16 (3) | 2.967 (2) | 151 (2) |
O1—H1A···O26iv | 0.84 (3) | 2.19 (3) | 2.953 (2) | 152 (3) |
O1—H1A···O24iv | 0.84 (3) | 2.53 (3) | 3.081 (2) | 124 (2) |
O1—H1B···O25viii | 0.82 (3) | 2.07 (3) | 2.866 (2) | 162 (3) |
Symmetry codes: (i) −x+3/2, y−1/2, −z+1/2; (ii) −x+1, −y, −z; (iii) x, y−1, z; (iv) −x+1, −y+1, −z; (v) −x+3/2, y+1/2, −z+1/2; (vi) x+1, y, z; (vii) −x+1/2, y+1/2, −z+1/2; (viii) x, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | [Co(NO2)2(C2H8N2)2][Co(NO2)4(C2H8N2)]·H2O |
Mr | 592.25 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 100 |
a, b, c (Å) | 14.7580 (5), 6.7060 (2), 20.6845 (7) |
β (°) | 96.969 (2) |
V (Å3) | 2031.96 (11) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 1.73 |
Crystal size (mm) | 0.40 × 0.15 × 0.05 |
Data collection | |
Diffractometer | Bruker X8 Kappa APEXII |
Absorption correction | Numerical (SADABS; Bruker, 2012) |
Tmin, Tmax | 0.692, 0.925 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 63576, 6280, 4801 |
Rint | 0.073 |
(sin θ/λ)max (Å−1) | 0.719 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.035, 0.087, 1.07 |
No. of reflections | 6280 |
No. of parameters | 340 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.72, −0.84 |
Computer programs: APEX2 (Bruker, 2012), SAINT (Bruker, 2012), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 2009), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
N11—H11A···O11i | 0.83 (3) | 2.26 (3) | 3.048 (2) | 158 (2) |
N11—H11B···O23ii | 0.79 (3) | 2.23 (3) | 2.991 (2) | 163 (2) |
N11—H11B···O13iii | 0.79 (3) | 2.57 (2) | 2.966 (2) | 113 (2) |
N12—H12A···O24iv | 0.86 (3) | 2.22 (3) | 3.060 (2) | 164 (2) |
N12—H12B···O12v | 0.80 (3) | 2.38 (3) | 3.030 (2) | 139 (2) |
N13—H13A···O22vi | 0.84 (3) | 2.42 (3) | 3.186 (2) | 152 (2) |
N13—H13B···O13iii | 0.87 (3) | 2.47 (3) | 3.206 (2) | 143 (2) |
N14—H14A···O27ii | 0.94 (3) | 2.12 (3) | 3.038 (2) | 164 (2) |
N14—H14B···O24iv | 0.85 (2) | 2.42 (2) | 3.060 (2) | 132 (2) |
N21—H21A···O28vii | 0.82 (3) | 2.56 (3) | 3.185 (2) | 134 (2) |
N22—H22A···O27viii | 0.83 (2) | 2.18 (3) | 2.981 (2) | 164 (2) |
N22—H22B···O1 | 0.89 (2) | 2.16 (3) | 2.967 (2) | 151 (2) |
O1—H1A···O26iv | 0.84 (3) | 2.19 (3) | 2.953 (2) | 152 (3) |
O1—H1A···O24iv | 0.84 (3) | 2.53 (3) | 3.081 (2) | 124 (2) |
O1—H1B···O25viii | 0.82 (3) | 2.07 (3) | 2.866 (2) | 162 (3) |
Symmetry codes: (i) −x+3/2, y−1/2, −z+1/2; (ii) −x+1, −y, −z; (iii) x, y−1, z; (iv) −x+1, −y+1, −z; (v) −x+3/2, y+1/2, −z+1/2; (vi) x+1, y, z; (vii) −x+1/2, y+1/2, −z+1/2; (viii) x, y+1, z. |
Acknowledgements
Financial support from the Conselho Nacional de Desenvolvimento Científico (CNPq, Brazil; grants 485245/2007–8 and 479747/2009–1), the Fundação de Amparo à Pesquisa (FAPERGS, Rio Grande do Sul; grant 10/1645–9) is gratefully acknowledged, as are fellowships from CNPq (JRMV & RAB; grant 308731/2009–3) and the Coordenação de Aperfeiçoamento de Pessoas de Nível Superior (CAPES, Brazil; JRMV). The diffractometer was funded by a CT-INFRA grant from the Financiadora de Estrutos e Projetos (FINEP, Brazil).
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Cobalt(III) complexes are classical examples in undergraduate inorganic experimental laboratories due to their ease of preparation and great stability (Angelici, 1969). The ethylenediamine complex cis-[bis(ethylenediamine-kN,N')dinitrito-κ-N-cobalt(III)] chloride is of particular interest due to its spontaneous resolution upon crystallization (Murmann, 1955; Bernal, 1985; Bernal & Kauffman, 1987). In an attempt to synthesize this compound, crystals of the title compound cis-[Co(NH2CH2CH2NH2)2(NO2)2] [Co(NH2CH2CH2NH2)(NO2)4].H2O, (I), were obtained instead.
Although the crystal structure of the compound (I) has been determined previously from visually estimated photographic data (Kushi et al., 1976), it is of rather low quality (R = 0.13) compared to today's standard, and more importantly the extensive hydrogen bonding was not noted, in part due to the inability to locate the H atoms of the water molecule. In addition, the atomic coordinates have not been deposited with the Cambridge Structure Database (CSD; Allen, 2002) and hence are not available in the public domain. We report here the redetermination of the crystal structure at 100 K with data measured up to 30 ° in θ.
The crystal structure of (I) is centrossymmetric with a racemic mixture of the Δ and Λ isomers of the complex cation, the complex anion and a lattice water molecule. In the complex cation, the two ethylenediamine ligands chelate to the CoIII ion, and the nitrito ligands bond via their N atoms to form an approximate octahedral coordination geometry. The complex anion is similar, with one ethylenediamine ligand and four nitrito ligands bonded to the central metal cation. The Co—N distances to the ethylenediamine ligands are similar in the two ion complexes, varying between 1.9141 (17) Å and 1.9811 (17) Å. This range is within the distribution for similar complexes with octahedrally coordinated Co(III) found in the CSD (Allen, 2002; version 5.33 as of November, 2011 with Feb., 2011, Mar., 2012 & May, 2012 updates], viz 1.97 (2) Å for 756 distances. There is a slight trans influence in the the cation complex where the Co—N distance is marginally longer (by ca 0.02 Å) for the N atoms trans to the nitrito ligands. The Co—N distances for the nitrito ligands show a larger variation with shorter distances in the complex cation, 1.9141 (17) & 1.9177 (16) Å, than those in the complex anion. The latter shows a stronger trans influence with the Co—N distances trans to the N atoms of the nitrito ligands longer (1.9413 (17) & 1.9502 (16) Å) than the Co—N distance trans to the ethylenediamine ligand (1.9215 (17) & 1.9240 (17) Å).
The packing diagram (Fig. 2), shows alternating columns of complex cations and anions in the crystallographic a direction. The lattice water molecule is located between the complex cation and anion. There is an intricate three-dimensional network of hydrogen bonding interactions between the NH2 groups and O atoms of nitrito ligands of neighboring ions and also of the lattice water molecule, which forms hydrogen bonds to four complex anions (Fig. 3; Table 1).