metal-organic compounds
Dichloridobis(3,4,5-trimethyl-1H-pyrazole-κN2)cobalt(II)
aDepartment of Chemistry and Physics, College of Science and Technology, Southern Arkansas University, Magnolia, AR 71753, USA, and bDepartment of Chemistry, University of Kentucky, Lexington, KY 40506, USA
*Correspondence e-mail: GannaLyubartseva@saumag.edu
In the title compound, [CoIICl2(C6H10N2)2], a pair of 3,4,5-trimethylpyrazoles act as monodentate ligands. Two Cl− anions are also bonded directly to the CoII atom, which has a CoN2Cl2 chromophore in a slightly distorted tetrahedral geometry. The two molecules in the are related by an approximate twofold rotation roughly parallel to the a axis. The amino H atom in the pyrazole ring participates in weak N—H⋯Cl hydrogen bonds to form chains that propagate roughly parallel to the c axis.
Related literature
For a similar tetrahedral complex with pyrazole, see: Zyryanova et al. (2005). For thermal decomposition studies, see: Petrovic et al. (1993). For a similar tetrahedral complex with 3,5-dimethylpyrazole, see: Leovac et al. (2007). For potential catalytic applications, see: Li et al. (2009); Oki et al. (1995). For additional related complexes, see: Sheu et al. (1996); Lyubartseva & Parkin (2010).
Experimental
Crystal data
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Refinement
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Data collection: COLLECT (Nonius, 1998); cell SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO-SMN (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 and local procedures.
Supporting information
https://doi.org/10.1107/S160053681003254X/ng5017sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681003254X/ng5017Isup2.hkl
CoCl2.6H2O (0.714 g, 3 mmol) was added to 3,4,5-trimethylpyrazole (0.668 g, 6 mmol) in a 50 ml round bottom flask and 20 ml tetrahydrofuran added to the reaction mixture with stirring. After 5 minutes stirring, the blue color reaction mixture was filtered and the filtrate was added drop wise to 500 ml of hexane with vigorous stirring. The resulting powder was filtered and found to be [bis(3,4,5-trimethylpyrazole)]-dichlorocobalt(II) (0.698 g, Yield=66.4%). For
this powder was dissolved in methylene chloride and layerd with hexane. Blue colored, analytically pure orthorhombic crystals were obtained after 3 days. Elemental analysis calculated for CoC12H20N4Cl2: C 41.16, H 5.76, N 16.00; found C 41.11, H 5.69, N 16.08. IR(cm-1) 3310, 2925, 1581, 1530, 1446, 1404, 1377, 1266, 1199, 1159, 1125, 1018, 950, 765, 697, 683, 598, 566, 490.H atoms were found in difference Fourier maps and subsequently placed in idealized positions with constrained distances of 0.98 Å (RCH3), 0.88 Å (N—H), and with Uiso(H) values set to either 1.2Ueq or 1.5Ueq (RCH3) of the attached atom.
Pyrazole complexes with transition metals are very important because of their similarities to regular constituents of proteins. They can also be potentially useful for catalysis (Li et al. 2009) and magnetism studies (Oki et al. 1995). To obtain a tetrahedral complex geometry it is often necessary to engineer the pyrazole ligand with different connectivity (Sheu et al. 1996). Here we report that the introduction of one more methyl group in the pyrazole ring at 4 position, in addition to 3 and 5 position, results in the efficient formation of a tetrahedral geometry.
The synthesis and characterization of the cobalt co-ordination compound containing the 3,4,5-trimethylpyrazole ligand is described. The compound has the formula CoII(C6H10N2)2Cl2 and been characterized by several spectroscopic methods and analytical techniques. 3,4,5-Trimethylpyrazole acts as a monodentate ligand and the anions are also bonded directly with the metal center. The cobalt atom has a CoN2Cl2 chromophore in a distorted tetrahedral geometry. Co–N distances are 2.004 (2) and 2.012 (2)Å for the pyrazole N atoms. Co–Cl distances are 2.2536 (7) and 2.2617 (7) Å. The amine hydrogen in the pyrazole ring participates in weak N—H—Cl hydrogen bonds to form chains that propagate roughly parallel to the c axis direction.
For a similar tetrahedral complex with pyrazole, see: Zyryanova et al. (2005). For thermal decomposition studies, see: Petrovic et al. (1993). For a similar tetrahedral complex with 3,5-dimethylpyrazole, see: Leovac et al. (2007). For potential catalytic applications, see: Li et al. (2009); Oki et al. (1995). For additional related complexes, see: Sheu et al. (1996); Lyubartseva & Parkin (2010).
Data collection: COLLECT (Nonius, 1998); cell
SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO-SMN (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and local procedures.Fig. 1. View of the title compound with the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. |
[CoCl2(C6H10N2)2] | F(000) = 2896 |
Mr = 350.15 | Dx = 1.441 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 15242 reflections |
a = 14.8880 (1) Å | θ = 1.0–27.5° |
b = 17.3980 (1) Å | µ = 1.39 mm−1 |
c = 24.9220 (2) Å | T = 90 K |
V = 6455.33 (8) Å3 | Block, blue |
Z = 16 | 0.30 × 0.28 × 0.19 mm |
Nonius KappaCCD diffractometer | 7404 independent reflections |
Radiation source: fine-focus sealed tube | 5822 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.064 |
Detector resolution: 9.1 pixels mm-1 | θmax = 27.5°, θmin = 1.6° |
ω scans at fixed χ = 55° | h = −19→19 |
Absorption correction: multi-scan (SCALEPACK; Otwinowski & Minor, 1997) | k = −22→22 |
Tmin = 0.590, Tmax = 0.746 | l = −32→32 |
111609 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)] = 0.043 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.111 | H-atom parameters constrained |
S = 1.15 | w = 1/[σ2(Fo2) + (0.0507P)2 + 7.0674P] where P = (Fo2 + 2Fc2)/3 |
7404 reflections | (Δ/σ)max = 0.001 |
355 parameters | Δρmax = 0.80 e Å−3 |
0 restraints | Δρmin = −0.60 e Å−3 |
[CoCl2(C6H10N2)2] | V = 6455.33 (8) Å3 |
Mr = 350.15 | Z = 16 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 14.8880 (1) Å | µ = 1.39 mm−1 |
b = 17.3980 (1) Å | T = 90 K |
c = 24.9220 (2) Å | 0.30 × 0.28 × 0.19 mm |
Nonius KappaCCD diffractometer | 7404 independent reflections |
Absorption correction: multi-scan (SCALEPACK; Otwinowski & Minor, 1997) | 5822 reflections with I > 2σ(I) |
Tmin = 0.590, Tmax = 0.746 | Rint = 0.064 |
111609 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.111 | H-atom parameters constrained |
S = 1.15 | Δρmax = 0.80 e Å−3 |
7404 reflections | Δρmin = −0.60 e Å−3 |
355 parameters |
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 > 2σ(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 | ||
Co1A | 0.70074 (2) | 0.11088 (2) | 0.365286 (14) | 0.01780 (10) | |
Cl1A | 0.73843 (5) | 0.00580 (4) | 0.31744 (3) | 0.02255 (15) | |
Cl2A | 0.80296 (5) | 0.16183 (4) | 0.42223 (3) | 0.02503 (15) | |
N1A | 0.59573 (15) | 0.09270 (13) | 0.41394 (9) | 0.0205 (5) | |
N2A | 0.59238 (15) | 0.12310 (13) | 0.46421 (8) | 0.0211 (5) | |
H2A | 0.6375 | 0.1468 | 0.4799 | 0.025* | |
N3A | 0.66803 (15) | 0.18364 (13) | 0.30568 (8) | 0.0196 (5) | |
N4A | 0.66770 (14) | 0.16085 (12) | 0.25323 (8) | 0.0179 (4) | |
H4A | 0.6812 | 0.1142 | 0.2423 | 0.021* | |
C1A | 0.51360 (18) | 0.06308 (14) | 0.40500 (10) | 0.0192 (5) | |
C2A | 0.45852 (19) | 0.07446 (15) | 0.44974 (10) | 0.0218 (6) | |
C3A | 0.51108 (19) | 0.11215 (15) | 0.48690 (11) | 0.0223 (6) | |
C4A | 0.49183 (19) | 0.02581 (17) | 0.35250 (11) | 0.0268 (6) | |
H4A1 | 0.4978 | 0.0636 | 0.3236 | 0.040* | |
H4A2 | 0.4301 | 0.0063 | 0.3534 | 0.040* | |
H4A3 | 0.5334 | −0.0169 | 0.3462 | 0.040* | |
C5A | 0.36239 (19) | 0.05170 (19) | 0.45728 (12) | 0.0306 (7) | |
H5A1 | 0.3534 | 0.0335 | 0.4941 | 0.046* | |
H5A2 | 0.3472 | 0.0105 | 0.4320 | 0.046* | |
H5A3 | 0.3236 | 0.0962 | 0.4506 | 0.046* | |
C6A | 0.4881 (2) | 0.13878 (18) | 0.54196 (11) | 0.0290 (6) | |
H6A1 | 0.5432 | 0.1525 | 0.5612 | 0.044* | |
H6A2 | 0.4570 | 0.0975 | 0.5613 | 0.044* | |
H6A3 | 0.4488 | 0.1839 | 0.5397 | 0.044* | |
C7A | 0.64302 (17) | 0.25790 (15) | 0.30523 (11) | 0.0195 (5) | |
C8A | 0.62787 (17) | 0.28238 (15) | 0.25262 (11) | 0.0203 (5) | |
C9A | 0.64395 (17) | 0.21919 (15) | 0.22035 (10) | 0.0189 (5) | |
C10A | 0.6328 (2) | 0.30248 (16) | 0.35591 (11) | 0.0258 (6) | |
H10A | 0.5689 | 0.3114 | 0.3629 | 0.039* | |
H10B | 0.6638 | 0.3519 | 0.3524 | 0.039* | |
H10C | 0.6591 | 0.2734 | 0.3857 | 0.039* | |
C11A | 0.60097 (19) | 0.36179 (15) | 0.23513 (12) | 0.0257 (6) | |
H11A | 0.6074 | 0.3662 | 0.1961 | 0.039* | |
H11B | 0.6397 | 0.3998 | 0.2527 | 0.039* | |
H11C | 0.5383 | 0.3712 | 0.2451 | 0.039* | |
C12A | 0.6347 (2) | 0.20858 (17) | 0.16140 (10) | 0.0261 (6) | |
H12A | 0.6667 | 0.1619 | 0.1504 | 0.039* | |
H12B | 0.6603 | 0.2531 | 0.1428 | 0.039* | |
H12C | 0.5710 | 0.2037 | 0.1521 | 0.039* | |
Co1B | 0.31918 (2) | 0.40924 (2) | 0.373980 (14) | 0.01860 (10) | |
Cl1B | 0.27079 (5) | 0.51575 (4) | 0.33151 (3) | 0.02458 (16) | |
Cl2B | 0.22703 (5) | 0.34966 (4) | 0.43286 (3) | 0.02729 (16) | |
N1B | 0.42685 (15) | 0.42502 (13) | 0.42153 (9) | 0.0206 (5) | |
N2B | 0.43489 (16) | 0.38675 (13) | 0.46881 (8) | 0.0217 (5) | |
H2B | 0.3908 | 0.3616 | 0.4844 | 0.026* | |
N3B | 0.34707 (15) | 0.33970 (13) | 0.31166 (8) | 0.0194 (5) | |
N4B | 0.34550 (15) | 0.36468 (12) | 0.25999 (8) | 0.0192 (5) | |
H4B | 0.3320 | 0.4119 | 0.2503 | 0.023* | |
C1B | 0.50868 (18) | 0.45440 (15) | 0.41148 (10) | 0.0203 (5) | |
C2B | 0.56832 (18) | 0.43508 (15) | 0.45274 (11) | 0.0211 (5) | |
C3B | 0.51843 (18) | 0.39196 (15) | 0.48875 (10) | 0.0211 (6) | |
C4B | 0.52534 (19) | 0.49953 (17) | 0.36144 (11) | 0.0259 (6) | |
H4B1 | 0.5535 | 0.4663 | 0.3345 | 0.039* | |
H4B2 | 0.5653 | 0.5428 | 0.3695 | 0.039* | |
H4B3 | 0.4682 | 0.5190 | 0.3475 | 0.039* | |
C5B | 0.66573 (19) | 0.45395 (18) | 0.45800 (12) | 0.0286 (6) | |
H5B1 | 0.6763 | 0.4799 | 0.4923 | 0.043* | |
H5B2 | 0.6838 | 0.4879 | 0.4285 | 0.043* | |
H5B3 | 0.7011 | 0.4065 | 0.4566 | 0.043* | |
C6B | 0.5461 (2) | 0.35618 (17) | 0.54041 (11) | 0.0283 (6) | |
H6B1 | 0.4926 | 0.3404 | 0.5605 | 0.042* | |
H6B2 | 0.5803 | 0.3935 | 0.5616 | 0.042* | |
H6B3 | 0.5837 | 0.3111 | 0.5332 | 0.042* | |
C7B | 0.37141 (17) | 0.26534 (15) | 0.30912 (11) | 0.0198 (5) | |
C8B | 0.38400 (18) | 0.24321 (15) | 0.25563 (11) | 0.0204 (5) | |
C9B | 0.36707 (17) | 0.30816 (15) | 0.22547 (10) | 0.0191 (5) | |
C10B | 0.3832 (2) | 0.21733 (17) | 0.35834 (11) | 0.0284 (6) | |
H10D | 0.4472 | 0.2073 | 0.3641 | 0.043* | |
H10E | 0.3513 | 0.1685 | 0.3538 | 0.043* | |
H10F | 0.3587 | 0.2447 | 0.3894 | 0.043* | |
C11B | 0.41032 (19) | 0.16500 (15) | 0.23556 (11) | 0.0251 (6) | |
H11D | 0.4018 | 0.1627 | 0.1966 | 0.038* | |
H11E | 0.3728 | 0.1259 | 0.2528 | 0.038* | |
H11F | 0.4736 | 0.1554 | 0.2441 | 0.038* | |
C12B | 0.37356 (19) | 0.32148 (16) | 0.16644 (10) | 0.0239 (6) | |
H12D | 0.3412 | 0.3686 | 0.1571 | 0.036* | |
H12E | 0.3470 | 0.2778 | 0.1473 | 0.036* | |
H12F | 0.4368 | 0.3267 | 0.1562 | 0.036* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Co1A | 0.01982 (19) | 0.01854 (19) | 0.01504 (18) | 0.00059 (14) | −0.00063 (13) | 0.00002 (13) |
Cl1A | 0.0250 (3) | 0.0212 (3) | 0.0215 (3) | 0.0030 (3) | −0.0011 (3) | −0.0038 (2) |
Cl2A | 0.0271 (4) | 0.0282 (3) | 0.0198 (3) | −0.0053 (3) | −0.0059 (3) | 0.0020 (3) |
N1A | 0.0224 (12) | 0.0221 (11) | 0.0170 (11) | 0.0012 (9) | −0.0023 (9) | −0.0016 (9) |
N2A | 0.0228 (12) | 0.0264 (12) | 0.0140 (11) | −0.0016 (9) | −0.0001 (9) | −0.0019 (9) |
N3A | 0.0226 (12) | 0.0205 (11) | 0.0158 (11) | 0.0007 (9) | −0.0003 (9) | −0.0010 (9) |
N4A | 0.0189 (11) | 0.0192 (11) | 0.0156 (10) | 0.0009 (9) | −0.0016 (8) | −0.0012 (8) |
C1A | 0.0212 (13) | 0.0163 (12) | 0.0202 (13) | 0.0009 (10) | −0.0024 (10) | 0.0017 (10) |
C2A | 0.0230 (14) | 0.0222 (13) | 0.0202 (13) | 0.0014 (11) | −0.0001 (11) | 0.0025 (11) |
C3A | 0.0248 (14) | 0.0225 (13) | 0.0197 (13) | 0.0022 (11) | 0.0027 (11) | 0.0019 (10) |
C4A | 0.0224 (14) | 0.0328 (16) | 0.0254 (15) | 0.0015 (12) | −0.0029 (12) | −0.0062 (12) |
C5A | 0.0255 (15) | 0.0382 (17) | 0.0280 (15) | −0.0046 (13) | 0.0010 (12) | 0.0020 (13) |
C6A | 0.0288 (16) | 0.0378 (17) | 0.0204 (14) | 0.0002 (13) | 0.0046 (12) | −0.0023 (12) |
C7A | 0.0177 (13) | 0.0187 (13) | 0.0222 (13) | −0.0005 (10) | 0.0000 (10) | −0.0015 (10) |
C8A | 0.0166 (13) | 0.0201 (13) | 0.0241 (14) | −0.0002 (10) | −0.0010 (10) | 0.0004 (11) |
C9A | 0.0163 (12) | 0.0214 (13) | 0.0191 (13) | −0.0008 (10) | −0.0023 (10) | 0.0025 (10) |
C10A | 0.0291 (15) | 0.0228 (14) | 0.0255 (14) | 0.0043 (12) | −0.0019 (12) | −0.0049 (11) |
C11A | 0.0256 (15) | 0.0220 (14) | 0.0295 (15) | 0.0019 (11) | −0.0064 (12) | 0.0038 (11) |
C12A | 0.0312 (16) | 0.0290 (15) | 0.0180 (13) | −0.0003 (12) | −0.0025 (11) | 0.0044 (11) |
Co1B | 0.02032 (19) | 0.01980 (19) | 0.01568 (18) | 0.00110 (14) | 0.00118 (14) | −0.00009 (14) |
Cl1B | 0.0278 (4) | 0.0231 (3) | 0.0228 (3) | 0.0049 (3) | 0.0012 (3) | 0.0036 (3) |
Cl2B | 0.0298 (4) | 0.0324 (4) | 0.0197 (3) | −0.0072 (3) | 0.0068 (3) | −0.0024 (3) |
N1B | 0.0229 (12) | 0.0228 (11) | 0.0161 (11) | −0.0006 (9) | 0.0005 (9) | 0.0013 (9) |
N2B | 0.0250 (12) | 0.0245 (12) | 0.0155 (11) | 0.0001 (9) | 0.0014 (9) | 0.0033 (9) |
N3B | 0.0211 (11) | 0.0222 (11) | 0.0150 (10) | 0.0013 (9) | 0.0015 (9) | 0.0021 (9) |
N4B | 0.0225 (12) | 0.0192 (11) | 0.0158 (11) | 0.0011 (9) | 0.0014 (9) | 0.0027 (8) |
C1B | 0.0222 (14) | 0.0202 (13) | 0.0186 (13) | 0.0015 (11) | 0.0012 (10) | −0.0012 (10) |
C2B | 0.0213 (14) | 0.0213 (13) | 0.0208 (13) | 0.0031 (11) | −0.0003 (11) | −0.0021 (11) |
C3B | 0.0236 (14) | 0.0219 (13) | 0.0179 (13) | 0.0036 (11) | −0.0004 (11) | −0.0035 (10) |
C4B | 0.0221 (14) | 0.0305 (15) | 0.0249 (15) | −0.0003 (12) | 0.0014 (11) | 0.0042 (12) |
C5B | 0.0257 (15) | 0.0319 (16) | 0.0282 (15) | −0.0009 (12) | −0.0024 (12) | 0.0016 (12) |
C6B | 0.0307 (16) | 0.0327 (16) | 0.0216 (14) | 0.0004 (13) | −0.0014 (12) | 0.0023 (12) |
C7B | 0.0183 (13) | 0.0182 (13) | 0.0229 (14) | −0.0003 (10) | 0.0005 (10) | −0.0006 (10) |
C8B | 0.0172 (13) | 0.0216 (13) | 0.0224 (13) | −0.0007 (10) | 0.0013 (10) | −0.0017 (11) |
C9B | 0.0159 (13) | 0.0216 (13) | 0.0197 (13) | −0.0029 (10) | 0.0017 (10) | −0.0039 (10) |
C10B | 0.0346 (17) | 0.0256 (15) | 0.0250 (15) | 0.0044 (13) | 0.0016 (12) | 0.0044 (12) |
C11B | 0.0246 (15) | 0.0208 (14) | 0.0299 (15) | 0.0027 (11) | 0.0032 (12) | −0.0050 (11) |
C12B | 0.0289 (15) | 0.0241 (14) | 0.0188 (13) | −0.0027 (11) | 0.0013 (11) | −0.0006 (11) |
Co1A—N1A | 2.004 (2) | Co1B—N3B | 2.012 (2) |
Co1A—N3A | 2.012 (2) | Co1B—N1B | 2.012 (2) |
Co1A—Cl1A | 2.2536 (7) | Co1B—Cl1B | 2.2524 (7) |
Co1A—Cl2A | 2.2617 (7) | Co1B—Cl2B | 2.2606 (7) |
N1A—C1A | 1.346 (3) | N1B—C1B | 1.345 (3) |
N1A—N2A | 1.361 (3) | N1B—N2B | 1.359 (3) |
N2A—C3A | 1.350 (3) | N2B—C3B | 1.342 (4) |
N2A—H2A | 0.8800 | N2B—H2B | 0.8800 |
N3A—C7A | 1.345 (3) | N3B—C7B | 1.345 (3) |
N3A—N4A | 1.366 (3) | N3B—N4B | 1.359 (3) |
N4A—C9A | 1.352 (3) | N4B—C9B | 1.345 (3) |
N4A—H4A | 0.8800 | N4B—H4B | 0.8800 |
C1A—C2A | 1.398 (4) | C1B—C2B | 1.400 (4) |
C1A—C4A | 1.496 (4) | C1B—C4B | 1.494 (4) |
C2A—C3A | 1.378 (4) | C2B—C3B | 1.386 (4) |
C2A—C5A | 1.497 (4) | C2B—C5B | 1.493 (4) |
C3A—C6A | 1.488 (4) | C3B—C6B | 1.488 (4) |
C4A—H4A1 | 0.9800 | C4B—H4B1 | 0.9800 |
C4A—H4A2 | 0.9800 | C4B—H4B2 | 0.9800 |
C4A—H4A3 | 0.9800 | C4B—H4B3 | 0.9800 |
C5A—H5A1 | 0.9800 | C5B—H5B1 | 0.9800 |
C5A—H5A2 | 0.9800 | C5B—H5B2 | 0.9800 |
C5A—H5A3 | 0.9800 | C5B—H5B3 | 0.9800 |
C6A—H6A1 | 0.9800 | C6B—H6B1 | 0.9800 |
C6A—H6A2 | 0.9800 | C6B—H6B2 | 0.9800 |
C6A—H6A3 | 0.9800 | C6B—H6B3 | 0.9800 |
C7A—C8A | 1.397 (4) | C7B—C8B | 1.400 (4) |
C7A—C10A | 1.490 (4) | C7B—C10B | 1.494 (4) |
C8A—C9A | 1.383 (4) | C8B—C9B | 1.380 (4) |
C8A—C11A | 1.503 (4) | C8B—C11B | 1.502 (4) |
C9A—C12A | 1.487 (4) | C9B—C12B | 1.493 (4) |
C10A—H10A | 0.9800 | C10B—H10D | 0.9800 |
C10A—H10B | 0.9800 | C10B—H10E | 0.9800 |
C10A—H10C | 0.9800 | C10B—H10F | 0.9800 |
C11A—H11A | 0.9800 | C11B—H11D | 0.9800 |
C11A—H11B | 0.9800 | C11B—H11E | 0.9800 |
C11A—H11C | 0.9800 | C11B—H11F | 0.9800 |
C12A—H12A | 0.9800 | C12B—H12D | 0.9800 |
C12A—H12B | 0.9800 | C12B—H12E | 0.9800 |
C12A—H12C | 0.9800 | C12B—H12F | 0.9800 |
N1A—Co1A—N3A | 110.94 (9) | N3B—Co1B—N1B | 111.86 (9) |
N1A—Co1A—Cl1A | 112.73 (7) | N3B—Co1B—Cl1B | 101.42 (6) |
N3A—Co1A—Cl1A | 100.38 (6) | N1B—Co1B—Cl1B | 114.79 (7) |
N1A—Co1A—Cl2A | 101.96 (7) | N3B—Co1B—Cl2B | 110.52 (7) |
N3A—Co1A—Cl2A | 112.31 (7) | N1B—Co1B—Cl2B | 99.43 (7) |
Cl1A—Co1A—Cl2A | 118.84 (3) | Cl1B—Co1B—Cl2B | 119.22 (3) |
C1A—N1A—N2A | 105.5 (2) | C1B—N1B—N2B | 105.6 (2) |
C1A—N1A—Co1A | 132.03 (18) | C1B—N1B—Co1B | 131.60 (18) |
N2A—N1A—Co1A | 121.63 (17) | N2B—N1B—Co1B | 120.93 (17) |
C3A—N2A—N1A | 111.3 (2) | C3B—N2B—N1B | 111.7 (2) |
C3A—N2A—H2A | 124.3 | C3B—N2B—H2B | 124.2 |
N1A—N2A—H2A | 124.3 | N1B—N2B—H2B | 124.2 |
C7A—N3A—N4A | 105.7 (2) | C7B—N3B—N4B | 105.5 (2) |
C7A—N3A—Co1A | 132.68 (18) | C7B—N3B—Co1B | 132.09 (18) |
N4A—N3A—Co1A | 121.65 (16) | N4B—N3B—Co1B | 122.38 (16) |
C9A—N4A—N3A | 111.3 (2) | C9B—N4B—N3B | 111.6 (2) |
C9A—N4A—H4A | 124.4 | C9B—N4B—H4B | 124.2 |
N3A—N4A—H4A | 124.4 | N3B—N4B—H4B | 124.2 |
N1A—C1A—C2A | 110.3 (2) | N1B—C1B—C2B | 110.3 (2) |
N1A—C1A—C4A | 120.5 (2) | N1B—C1B—C4B | 120.4 (2) |
C2A—C1A—C4A | 129.2 (2) | C2B—C1B—C4B | 129.3 (2) |
C3A—C2A—C1A | 105.7 (2) | C3B—C2B—C1B | 105.4 (2) |
C3A—C2A—C5A | 125.7 (3) | C3B—C2B—C5B | 125.7 (3) |
C1A—C2A—C5A | 128.6 (3) | C1B—C2B—C5B | 128.9 (3) |
N2A—C3A—C2A | 107.1 (2) | N2B—C3B—C2B | 107.1 (2) |
N2A—C3A—C6A | 123.3 (3) | N2B—C3B—C6B | 123.3 (3) |
C2A—C3A—C6A | 129.6 (3) | C2B—C3B—C6B | 129.7 (3) |
C1A—C4A—H4A1 | 109.5 | C1B—C4B—H4B1 | 109.5 |
C1A—C4A—H4A2 | 109.5 | C1B—C4B—H4B2 | 109.5 |
H4A1—C4A—H4A2 | 109.5 | H4B1—C4B—H4B2 | 109.5 |
C1A—C4A—H4A3 | 109.5 | C1B—C4B—H4B3 | 109.5 |
H4A1—C4A—H4A3 | 109.5 | H4B1—C4B—H4B3 | 109.5 |
H4A2—C4A—H4A3 | 109.5 | H4B2—C4B—H4B3 | 109.5 |
C2A—C5A—H5A1 | 109.5 | C2B—C5B—H5B1 | 109.5 |
C2A—C5A—H5A2 | 109.5 | C2B—C5B—H5B2 | 109.5 |
H5A1—C5A—H5A2 | 109.5 | H5B1—C5B—H5B2 | 109.5 |
C2A—C5A—H5A3 | 109.5 | C2B—C5B—H5B3 | 109.5 |
H5A1—C5A—H5A3 | 109.5 | H5B1—C5B—H5B3 | 109.5 |
H5A2—C5A—H5A3 | 109.5 | H5B2—C5B—H5B3 | 109.5 |
C3A—C6A—H6A1 | 109.5 | C3B—C6B—H6B1 | 109.5 |
C3A—C6A—H6A2 | 109.5 | C3B—C6B—H6B2 | 109.5 |
H6A1—C6A—H6A2 | 109.5 | H6B1—C6B—H6B2 | 109.5 |
C3A—C6A—H6A3 | 109.5 | C3B—C6B—H6B3 | 109.5 |
H6A1—C6A—H6A3 | 109.5 | H6B1—C6B—H6B3 | 109.5 |
H6A2—C6A—H6A3 | 109.5 | H6B2—C6B—H6B3 | 109.5 |
N3A—C7A—C8A | 110.2 (2) | N3B—C7B—C8B | 110.2 (2) |
N3A—C7A—C10A | 121.4 (2) | N3B—C7B—C10B | 122.0 (2) |
C8A—C7A—C10A | 128.4 (2) | C8B—C7B—C10B | 127.7 (2) |
C9A—C8A—C7A | 106.0 (2) | C9B—C8B—C7B | 105.6 (2) |
C9A—C8A—C11A | 127.5 (2) | C9B—C8B—C11B | 127.5 (2) |
C7A—C8A—C11A | 126.6 (2) | C7B—C8B—C11B | 127.0 (2) |
N4A—C9A—C8A | 106.8 (2) | N4B—C9B—C8B | 107.1 (2) |
N4A—C9A—C12A | 122.0 (2) | N4B—C9B—C12B | 122.2 (2) |
C8A—C9A—C12A | 131.1 (2) | C8B—C9B—C12B | 130.7 (2) |
C7A—C10A—H10A | 109.5 | C7B—C10B—H10D | 109.5 |
C7A—C10A—H10B | 109.5 | C7B—C10B—H10E | 109.5 |
H10A—C10A—H10B | 109.5 | H10D—C10B—H10E | 109.5 |
C7A—C10A—H10C | 109.5 | C7B—C10B—H10F | 109.5 |
H10A—C10A—H10C | 109.5 | H10D—C10B—H10F | 109.5 |
H10B—C10A—H10C | 109.5 | H10E—C10B—H10F | 109.5 |
C8A—C11A—H11A | 109.5 | C8B—C11B—H11D | 109.5 |
C8A—C11A—H11B | 109.5 | C8B—C11B—H11E | 109.5 |
H11A—C11A—H11B | 109.5 | H11D—C11B—H11E | 109.5 |
C8A—C11A—H11C | 109.5 | C8B—C11B—H11F | 109.5 |
H11A—C11A—H11C | 109.5 | H11D—C11B—H11F | 109.5 |
H11B—C11A—H11C | 109.5 | H11E—C11B—H11F | 109.5 |
C9A—C12A—H12A | 109.5 | C9B—C12B—H12D | 109.5 |
C9A—C12A—H12B | 109.5 | C9B—C12B—H12E | 109.5 |
H12A—C12A—H12B | 109.5 | H12D—C12B—H12E | 109.5 |
C9A—C12A—H12C | 109.5 | C9B—C12B—H12F | 109.5 |
H12A—C12A—H12C | 109.5 | H12D—C12B—H12F | 109.5 |
H12B—C12A—H12C | 109.5 | H12E—C12B—H12F | 109.5 |
N3A—Co1A—N1A—C1A | 60.6 (3) | N3B—Co1B—N1B—C1B | 59.8 (3) |
Cl1A—Co1A—N1A—C1A | −51.1 (2) | Cl1B—Co1B—N1B—C1B | −55.1 (3) |
Cl2A—Co1A—N1A—C1A | −179.6 (2) | Cl2B—Co1B—N1B—C1B | 176.5 (2) |
N3A—Co1A—N1A—N2A | −107.49 (19) | N3B—Co1B—N1B—N2B | −101.98 (19) |
Cl1A—Co1A—N1A—N2A | 140.83 (17) | Cl1B—Co1B—N1B—N2B | 143.17 (17) |
Cl2A—Co1A—N1A—N2A | 12.3 (2) | Cl2B—Co1B—N1B—N2B | 14.73 (19) |
C1A—N1A—N2A—C3A | 0.9 (3) | C1B—N1B—N2B—C3B | 0.6 (3) |
Co1A—N1A—N2A—C3A | 171.76 (17) | Co1B—N1B—N2B—C3B | 166.59 (17) |
N1A—Co1A—N3A—C7A | 63.9 (3) | N1B—Co1B—N3B—C7B | 63.7 (3) |
Cl1A—Co1A—N3A—C7A | −176.7 (2) | Cl1B—Co1B—N3B—C7B | −173.5 (2) |
Cl2A—Co1A—N3A—C7A | −49.4 (3) | Cl2B—Co1B—N3B—C7B | −46.1 (3) |
N1A—Co1A—N3A—N4A | −115.55 (19) | N1B—Co1B—N3B—N4B | −114.79 (19) |
Cl1A—Co1A—N3A—N4A | 3.8 (2) | Cl1B—Co1B—N3B—N4B | 8.0 (2) |
Cl2A—Co1A—N3A—N4A | 131.07 (17) | Cl2B—Co1B—N3B—N4B | 135.43 (18) |
C7A—N3A—N4A—C9A | 0.6 (3) | C7B—N3B—N4B—C9B | 0.7 (3) |
Co1A—N3A—N4A—C9A | −179.83 (17) | Co1B—N3B—N4B—C9B | 179.50 (17) |
N2A—N1A—C1A—C2A | −0.3 (3) | N2B—N1B—C1B—C2B | −0.4 (3) |
Co1A—N1A—C1A—C2A | −169.78 (19) | Co1B—N1B—C1B—C2B | −164.27 (19) |
N2A—N1A—C1A—C4A | 178.7 (2) | N2B—N1B—C1B—C4B | 178.9 (2) |
Co1A—N1A—C1A—C4A | 9.2 (4) | Co1B—N1B—C1B—C4B | 15.0 (4) |
N1A—C1A—C2A—C3A | −0.4 (3) | N1B—C1B—C2B—C3B | 0.1 (3) |
C4A—C1A—C2A—C3A | −179.3 (3) | C4B—C1B—C2B—C3B | −179.1 (3) |
N1A—C1A—C2A—C5A | 179.4 (3) | N1B—C1B—C2B—C5B | 178.8 (3) |
C4A—C1A—C2A—C5A | 0.5 (5) | C4B—C1B—C2B—C5B | −0.4 (5) |
N1A—N2A—C3A—C2A | −1.2 (3) | N1B—N2B—C3B—C2B | −0.6 (3) |
N1A—N2A—C3A—C6A | 179.5 (2) | N1B—N2B—C3B—C6B | 179.3 (2) |
C1A—C2A—C3A—N2A | 0.9 (3) | C1B—C2B—C3B—N2B | 0.3 (3) |
C5A—C2A—C3A—N2A | −178.9 (3) | C5B—C2B—C3B—N2B | −178.5 (3) |
C1A—C2A—C3A—C6A | −179.8 (3) | C1B—C2B—C3B—C6B | −179.6 (3) |
C5A—C2A—C3A—C6A | 0.4 (5) | C5B—C2B—C3B—C6B | 1.6 (5) |
N4A—N3A—C7A—C8A | −0.7 (3) | N4B—N3B—C7B—C8B | −0.8 (3) |
Co1A—N3A—C7A—C8A | 179.77 (19) | Co1B—N3B—C7B—C8B | −179.47 (19) |
N4A—N3A—C7A—C10A | 178.1 (2) | N4B—N3B—C7B—C10B | 178.4 (2) |
Co1A—N3A—C7A—C10A | −1.4 (4) | Co1B—N3B—C7B—C10B | −0.2 (4) |
N3A—C7A—C8A—C9A | 0.6 (3) | N3B—C7B—C8B—C9B | 0.7 (3) |
C10A—C7A—C8A—C9A | −178.1 (3) | C10B—C7B—C8B—C9B | −178.5 (3) |
N3A—C7A—C8A—C11A | −178.6 (2) | N3B—C7B—C8B—C11B | −179.3 (2) |
C10A—C7A—C8A—C11A | 2.7 (5) | C10B—C7B—C8B—C11B | 1.6 (5) |
N3A—N4A—C9A—C8A | −0.2 (3) | N3B—N4B—C9B—C8B | −0.3 (3) |
N3A—N4A—C9A—C12A | −177.4 (2) | N3B—N4B—C9B—C12B | −177.7 (2) |
C7A—C8A—C9A—N4A | −0.2 (3) | C7B—C8B—C9B—N4B | −0.2 (3) |
C11A—C8A—C9A—N4A | 178.9 (3) | C11B—C8B—C9B—N4B | 179.7 (3) |
C7A—C8A—C9A—C12A | 176.6 (3) | C7B—C8B—C9B—C12B | 176.9 (3) |
C11A—C8A—C9A—C12A | −4.2 (5) | C11B—C8B—C9B—C12B | −3.2 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2A—H2A···Cl2Bi | 0.88 | 2.55 | 3.290 (2) | 142 |
N2A—H2A···Cl2A | 0.88 | 2.86 | 3.373 (2) | 118 |
N4A—H4A···Cl1Bii | 0.88 | 2.61 | 3.416 (2) | 152 |
N4A—H4A···Cl1A | 0.88 | 2.79 | 3.309 (2) | 119 |
N2B—H2B···Cl2Aiii | 0.88 | 2.70 | 3.456 (2) | 145 |
N2B—H2B···Cl2B | 0.88 | 2.76 | 3.286 (2) | 119 |
N4B—H4B···Cl1Aiv | 0.88 | 2.57 | 3.363 (2) | 150 |
N4B—H4B···Cl1B | 0.88 | 2.86 | 3.365 (2) | 118 |
Symmetry codes: (i) x+1/2, −y+1/2, −z+1; (ii) −x+1, y−1/2, −z+1/2; (iii) x−1/2, −y+1/2, −z+1; (iv) −x+1, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | [CoCl2(C6H10N2)2] |
Mr | 350.15 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 90 |
a, b, c (Å) | 14.8880 (1), 17.3980 (1), 24.9220 (2) |
V (Å3) | 6455.33 (8) |
Z | 16 |
Radiation type | Mo Kα |
µ (mm−1) | 1.39 |
Crystal size (mm) | 0.30 × 0.28 × 0.19 |
Data collection | |
Diffractometer | Nonius KappaCCD diffractometer |
Absorption correction | Multi-scan (SCALEPACK; Otwinowski & Minor, 1997) |
Tmin, Tmax | 0.590, 0.746 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 111609, 7404, 5822 |
Rint | 0.064 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.111, 1.15 |
No. of reflections | 7404 |
No. of parameters | 355 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.80, −0.60 |
Computer programs: COLLECT (Nonius, 1998), SCALEPACK (Otwinowski & Minor, 1997), DENZO-SMN (Otwinowski & Minor, 1997), SHELXS97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008) and local procedures.
D—H···A | D—H | H···A | D···A | D—H···A |
N2A—H2A···Cl2Bi | 0.88 | 2.55 | 3.290 (2) | 142.1 |
N2A—H2A···Cl2A | 0.88 | 2.86 | 3.373 (2) | 118.4 |
N4A—H4A···Cl1Bii | 0.88 | 2.61 | 3.416 (2) | 152.4 |
N4A—H4A···Cl1A | 0.88 | 2.79 | 3.309 (2) | 119.0 |
N2B—H2B···Cl2Aiii | 0.88 | 2.70 | 3.456 (2) | 144.9 |
N2B—H2B···Cl2B | 0.88 | 2.76 | 3.286 (2) | 119.3 |
N4B—H4B···Cl1Aiv | 0.88 | 2.57 | 3.363 (2) | 150.0 |
N4B—H4B···Cl1B | 0.88 | 2.86 | 3.365 (2) | 117.9 |
Symmetry codes: (i) x+1/2, −y+1/2, −z+1; (ii) −x+1, y−1/2, −z+1/2; (iii) x−1/2, −y+1/2, −z+1; (iv) −x+1, y+1/2, −z+1/2. |
Acknowledgements
GL gratefully acknowledges the Department of Chemistry and Physics, College of Science and Technology, Southern Arkansas University, for the financial support.
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.
Pyrazole complexes with transition metals are very important because of their similarities to regular constituents of proteins. They can also be potentially useful for catalysis (Li et al. 2009) and magnetism studies (Oki et al. 1995). To obtain a tetrahedral complex geometry it is often necessary to engineer the pyrazole ligand with different connectivity (Sheu et al. 1996). Here we report that the introduction of one more methyl group in the pyrazole ring at 4 position, in addition to 3 and 5 position, results in the efficient formation of a tetrahedral geometry.
The synthesis and characterization of the cobalt co-ordination compound containing the 3,4,5-trimethylpyrazole ligand is described. The compound has the formula CoII(C6H10N2)2Cl2 and been characterized by several spectroscopic methods and analytical techniques. 3,4,5-Trimethylpyrazole acts as a monodentate ligand and the anions are also bonded directly with the metal center. The cobalt atom has a CoN2Cl2 chromophore in a distorted tetrahedral geometry. Co–N distances are 2.004 (2) and 2.012 (2)Å for the pyrazole N atoms. Co–Cl distances are 2.2536 (7) and 2.2617 (7) Å. The amine hydrogen in the pyrazole ring participates in weak N—H—Cl hydrogen bonds to form chains that propagate roughly parallel to the c axis direction.