metal-organic compounds
A second monoclinic polymorph of {bis[5-methyl-3-(trifluoromethyl)pyrazol-1-yl]borato}{tris[5-methyl-3-(trifluoromethyl)pyrazol-1-yl]borato}cobalt(II): a structure containing a B—H⋯Co agostic interaction
aDepartment of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854 USA
*Correspondence e-mail: DZSquared@aol.com
The title compound, [Co(C10H10BF6N4)(C15H13BF9N6)], is a polymorph of the previously reported neutral cobalt(II) complex [Stibrany & Potenza (2010). Acta Cryst. E66, m506–m507], which contains one each of the monoanionic ligands, bis[5-methyl-3-(trifluoromethyl)pyrazol-1-yl]borate (Bp) and tris[5-methyl-3-(trifluoromethyl)pyrazol-1-yl]borate (Tp). A distorted octahedral coordination geometry of the CoII atom results from ligation of an H atom, which is part of an agostic B—H⋯Co interaction [H⋯Co = 2.12 (3) Å], and by five imine N atoms, two from a Bp ligand and three from a Tp ligand. Weak intra- and intermolecular C—F⋯π interactions with F⋯centroid distances ranging from 3.025 (4) to 3.605 (4) Å are observed.
Related literature
For our study of nitrogen-containing heterocyles and their complexes with metal ions, see: Stibrany & Potenza (2006, 2009a,b); Stibrany et al. (1999, 2005, 2006). For a polymorph of the title compound, see: Stibrany & Potenza (2010). For oxidation studies of copper and cobalt complexes utilizing the title ligand, see: Gorun et al. (2000). For agostic interactions, see: Ruman et al. (2001, 2002); Siemer et al. (2001); Ghosh et al. (1998).
Experimental
Crystal data
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Refinement
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Data collection: SMART WNT/2000 (Bruker, 2000); cell SAINT-Plus (Bruker, 2000); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPIII (Burnett & Johnson, 1996) and ORTEP-32 (Farrugia, 1997); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
Supporting information
10.1107/S1600536811021994/rz2601sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811021994/rz2601Isup2.hkl
Both Tp and Bp ligands were prepared as previously reported (Gorun et al., 2000). To a flask containing 10 ml of acetonitrile, 60 mg of Co(Bp)2 (0.088 mmol) was disssolved to give a red-purple solution. Then 44 mg of KTp (0.088 mmol) was added and the mixture was allowed to stir for 10 min. giving little color change. The mixture was filtered to remove any solids and yielded a clear red-purple solution, which was left to evaporate slowly. Upon evaporation, a major dichroic red-orange phase (compound (I)) was separated mechanically and characterized. IR (KBr pellet, cm-1); 2570(Tp, B—H, w), 2492(Bp, B—H, w), 2217(Bp, B—H···Co, w), 1471(s), 1262(s), 1163(s), 1126(s), 1002(s), 800(m), 650(m).
Hydrogen atoms of the methyl groups were located on difference Fiourier maps and were restrained. H atoms of the pyrrole fragments were positioned geometrically using a riding model, with C—H = 0.98 Å for methyl H atoms, 0.95 Å for pyrrole H atoms, and with Uiso(H) = 1.2 Ueq(C). B—H hydrogen atom coordinates and isotropic displacement parameters were refined.
Data collection: SMART WNT/2000 (Bruker, 2000); cell
SAINT-Plus (Bruker, 2000); data reduction: SAINT-Plus (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) and ORTEP-32 (Farrugia, 1997); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The molecular structure of the title compound showing displacement ellipsoids drawn at the 35% probability level. H atoms are shown as spheres of arbitrary radius. |
[Co(C10H10BF6N4)(C15H13BF9N6)] | F(000) = 3320 |
Mr = 829.08 | Dx = 1.631 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 910 reflections |
a = 18.593 (2) Å | θ = 2.2–22.4° |
b = 12.1167 (13) Å | µ = 0.63 mm−1 |
c = 30.720 (3) Å | T = 298 K |
β = 102.721 (2)° | Prism, orange-red |
V = 6751.1 (13) Å3 | 0.28 × 0.24 × 0.12 mm |
Z = 8 |
Bruker SMART CCD area-detector diffractometer | 7431 independent reflections |
Radiation source: fine-focus sealed tube | 5522 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.032 |
ϕ and ω scans | θmax = 27.1°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Blessing, 1995) | h = −23→23 |
Tmin = 0.875, Tmax = 1.00 | k = −15→15 |
32390 measured reflections | l = −38→39 |
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)] = 0.059 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.167 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.0985P)2 + 6.350P] where P = (Fo2 + 2Fc2)/3 |
7431 reflections | (Δ/σ)max = 0.001 |
495 parameters | Δρmax = 0.69 e Å−3 |
0 restraints | Δρmin = −0.32 e Å−3 |
[Co(C10H10BF6N4)(C15H13BF9N6)] | V = 6751.1 (13) Å3 |
Mr = 829.08 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 18.593 (2) Å | µ = 0.63 mm−1 |
b = 12.1167 (13) Å | T = 298 K |
c = 30.720 (3) Å | 0.28 × 0.24 × 0.12 mm |
β = 102.721 (2)° |
Bruker SMART CCD area-detector diffractometer | 7431 independent reflections |
Absorption correction: multi-scan (SADABS; Blessing, 1995) | 5522 reflections with I > 2σ(I) |
Tmin = 0.875, Tmax = 1.00 | Rint = 0.032 |
32390 measured reflections |
R[F2 > 2σ(F2)] = 0.059 | 0 restraints |
wR(F2) = 0.167 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 0.69 e Å−3 |
7431 reflections | Δρmin = −0.32 e Å−3 |
495 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 > 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 | 0.28653 (2) | 0.88792 (3) | 0.876253 (13) | 0.04318 (14) | |
F1 | 0.2096 (2) | 1.0806 (3) | 0.97276 (12) | 0.1186 (11) | |
F2 | 0.16548 (16) | 0.9517 (3) | 1.00620 (9) | 0.1087 (10) | |
F3 | 0.15337 (14) | 0.9479 (3) | 0.93573 (9) | 0.1045 (9) | |
F4 | 0.34590 (19) | 1.0689 (3) | 0.81275 (12) | 0.1270 (12) | |
F5 | 0.4369 (3) | 1.0278 (4) | 0.78800 (13) | 0.178 (2) | |
F6 | 0.4449 (3) | 1.1573 (3) | 0.83096 (17) | 0.1721 (19) | |
F7 | 0.15694 (15) | 0.6605 (3) | 0.85333 (12) | 0.1158 (11) | |
F8 | 0.18416 (17) | 0.4977 (2) | 0.84101 (12) | 0.1135 (10) | |
F9 | 0.1996 (2) | 0.6240 (3) | 0.79751 (10) | 0.1371 (14) | |
F10 | 0.38793 (14) | 0.7600 (3) | 0.81139 (9) | 0.1108 (11) | |
F11 | 0.33643 (17) | 0.6704 (3) | 0.75392 (12) | 0.1122 (10) | |
F12 | 0.38456 (17) | 0.8212 (3) | 0.74664 (13) | 0.1245 (12) | |
F13 | 0.36640 (15) | 1.1157 (2) | 0.93361 (10) | 0.1001 (9) | |
F14 | 0.36229 (18) | 1.2527 (3) | 0.89093 (12) | 0.1275 (12) | |
F15 | 0.3115 (2) | 1.2626 (3) | 0.94472 (13) | 0.1412 (14) | |
N1 | 0.30398 (14) | 0.8830 (2) | 0.94819 (8) | 0.0483 (6) | |
N2 | 0.36749 (14) | 0.8317 (2) | 0.96912 (8) | 0.0500 (6) | |
N3 | 0.40019 (15) | 0.9216 (2) | 0.88139 (9) | 0.0533 (6) | |
N4 | 0.44793 (14) | 0.8664 (2) | 0.91406 (9) | 0.0520 (6) | |
N5 | 0.30701 (14) | 0.7122 (2) | 0.88605 (9) | 0.0488 (6) | |
N6 | 0.37587 (15) | 0.6891 (2) | 0.91109 (8) | 0.0509 (6) | |
N7 | 0.25381 (13) | 0.8603 (2) | 0.80721 (8) | 0.0482 (6) | |
N8 | 0.18320 (13) | 0.8959 (2) | 0.79314 (9) | 0.0502 (6) | |
N9 | 0.24139 (13) | 1.0495 (2) | 0.87252 (8) | 0.0483 (6) | |
N10 | 0.17078 (13) | 1.0446 (2) | 0.84856 (8) | 0.0476 (6) | |
C1 | 0.2001 (2) | 0.9716 (4) | 0.97340 (14) | 0.0728 (10) | |
C2 | 0.2703 (2) | 0.9112 (3) | 0.98080 (11) | 0.0546 (8) | |
C3 | 0.3116 (2) | 0.8782 (3) | 1.02190 (12) | 0.0673 (10) | |
H3 | 0.2997 | 0.8882 | 1.0495 | 0.081* | |
C4 | 0.3728 (2) | 0.8286 (3) | 1.01390 (11) | 0.0605 (8) | |
C5 | 0.4365 (3) | 0.7800 (4) | 1.04622 (13) | 0.0868 (13) | |
H5A | 0.4474 | 0.7084 | 1.0360 | 0.130* | |
H5B | 0.4244 | 0.7733 | 1.0749 | 0.130* | |
H5C | 0.4788 | 0.8271 | 1.0486 | 0.130* | |
C6 | 0.4145 (3) | 1.0583 (4) | 0.82312 (17) | 0.0884 (13) | |
C7 | 0.4429 (2) | 0.9846 (3) | 0.86181 (13) | 0.0643 (9) | |
C8 | 0.5164 (2) | 0.9703 (4) | 0.88129 (15) | 0.0771 (11) | |
H8 | 0.5564 | 1.0047 | 0.8734 | 0.093* | |
C9 | 0.51825 (19) | 0.8952 (3) | 0.91462 (14) | 0.0681 (10) | |
C10 | 0.5832 (2) | 0.8483 (6) | 0.94721 (19) | 0.1079 (18) | |
H10A | 0.5791 | 0.8656 | 0.9771 | 0.162* | |
H10B | 0.6278 | 0.8797 | 0.9418 | 0.162* | |
H10C | 0.5842 | 0.7697 | 0.9436 | 0.162* | |
C11 | 0.2065 (2) | 0.6009 (3) | 0.83940 (14) | 0.0686 (10) | |
C12 | 0.2820 (2) | 0.6161 (3) | 0.86740 (11) | 0.0561 (8) | |
C13 | 0.3333 (2) | 0.5337 (3) | 0.87903 (13) | 0.0668 (9) | |
H13 | 0.3286 | 0.4603 | 0.8700 | 0.080* | |
C14 | 0.3926 (2) | 0.5815 (3) | 0.90657 (12) | 0.0630 (9) | |
C15 | 0.4641 (3) | 0.5313 (4) | 0.92941 (17) | 0.0940 (14) | |
H15A | 0.5040 | 0.5758 | 0.9241 | 0.141* | |
H15B | 0.4679 | 0.4583 | 0.9179 | 0.141* | |
H15C | 0.4665 | 0.5273 | 0.9609 | 0.141* | |
C16 | 0.3460 (2) | 0.7703 (4) | 0.77177 (13) | 0.0711 (10) | |
C17 | 0.27437 (18) | 0.8250 (3) | 0.77033 (11) | 0.0553 (8) | |
C18 | 0.2182 (2) | 0.8380 (3) | 0.73323 (12) | 0.0637 (9) | |
H18 | 0.2188 | 0.8197 | 0.7039 | 0.076* | |
C19 | 0.16104 (19) | 0.8835 (3) | 0.74851 (11) | 0.0583 (8) | |
C20 | 0.0860 (2) | 0.9147 (4) | 0.72326 (14) | 0.0837 (13) | |
H20A | 0.0529 | 0.8539 | 0.7232 | 0.126* | |
H20B | 0.0878 | 0.9329 | 0.6931 | 0.126* | |
H20C | 0.0689 | 0.9775 | 0.7372 | 0.126* | |
C21 | 0.3222 (2) | 1.1949 (3) | 0.91380 (15) | 0.0767 (11) | |
C22 | 0.25220 (19) | 1.1548 (3) | 0.88547 (11) | 0.0553 (8) | |
C23 | 0.1893 (2) | 1.2165 (3) | 0.86992 (13) | 0.0632 (9) | |
H23 | 0.1830 | 1.2915 | 0.8742 | 0.076* | |
C24 | 0.13797 (19) | 1.1441 (3) | 0.84681 (11) | 0.0546 (8) | |
C25 | 0.0598 (2) | 1.1627 (4) | 0.82443 (15) | 0.0764 (11) | |
H25A | 0.0505 | 1.1322 | 0.7949 | 0.115* | |
H25B | 0.0498 | 1.2405 | 0.8227 | 0.115* | |
H25C | 0.0284 | 1.1275 | 0.8412 | 0.115* | |
B1 | 0.4190 (2) | 0.7788 (3) | 0.94208 (12) | 0.0532 (8) | |
B2 | 0.1443 (2) | 0.9287 (3) | 0.83098 (13) | 0.0528 (8) | |
H1B | 0.4671 (19) | 0.741 (3) | 0.9652 (12) | 0.060 (9)* | |
H21B | 0.1701 (18) | 0.870 (3) | 0.8601 (12) | 0.055 (9)* | |
H22B | 0.085 (2) | 0.929 (3) | 0.8187 (12) | 0.061 (9)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Co1 | 0.0438 (2) | 0.0430 (2) | 0.0410 (2) | 0.00260 (16) | 0.00549 (15) | 0.00325 (16) |
F1 | 0.143 (3) | 0.0821 (18) | 0.145 (3) | 0.0403 (18) | 0.063 (2) | 0.0102 (18) |
F2 | 0.1070 (19) | 0.156 (3) | 0.0809 (17) | 0.0325 (19) | 0.0585 (15) | 0.0171 (17) |
F3 | 0.0719 (15) | 0.173 (3) | 0.0713 (16) | 0.0321 (17) | 0.0217 (13) | −0.0014 (17) |
F4 | 0.103 (2) | 0.150 (3) | 0.122 (3) | −0.007 (2) | 0.0127 (19) | 0.072 (2) |
F5 | 0.238 (5) | 0.208 (5) | 0.111 (3) | 0.051 (4) | 0.089 (3) | 0.060 (3) |
F6 | 0.196 (4) | 0.096 (2) | 0.207 (5) | −0.045 (3) | 0.007 (3) | 0.055 (3) |
F7 | 0.0792 (17) | 0.095 (2) | 0.161 (3) | −0.0026 (15) | 0.0009 (18) | −0.042 (2) |
F8 | 0.110 (2) | 0.0618 (14) | 0.163 (3) | −0.0306 (14) | 0.018 (2) | −0.0054 (16) |
F9 | 0.129 (3) | 0.192 (4) | 0.0765 (19) | −0.080 (2) | −0.0068 (17) | 0.014 (2) |
F10 | 0.0732 (15) | 0.178 (3) | 0.0759 (16) | 0.0625 (18) | 0.0036 (13) | −0.0179 (17) |
F11 | 0.108 (2) | 0.093 (2) | 0.137 (3) | 0.0313 (16) | 0.0305 (18) | −0.0323 (18) |
F12 | 0.100 (2) | 0.135 (3) | 0.162 (3) | 0.0265 (19) | 0.080 (2) | 0.032 (2) |
F13 | 0.0914 (17) | 0.0696 (15) | 0.113 (2) | −0.0057 (13) | −0.0352 (15) | −0.0066 (13) |
F14 | 0.115 (2) | 0.119 (2) | 0.135 (3) | −0.054 (2) | −0.002 (2) | 0.019 (2) |
F15 | 0.136 (3) | 0.120 (2) | 0.144 (3) | 0.008 (2) | −0.020 (2) | −0.084 (2) |
N1 | 0.0522 (14) | 0.0476 (13) | 0.0450 (13) | 0.0039 (11) | 0.0104 (11) | 0.0029 (11) |
N2 | 0.0582 (15) | 0.0491 (14) | 0.0400 (13) | 0.0015 (12) | 0.0047 (11) | 0.0040 (11) |
N3 | 0.0535 (15) | 0.0562 (15) | 0.0500 (14) | −0.0023 (12) | 0.0106 (12) | 0.0088 (12) |
N4 | 0.0429 (13) | 0.0603 (16) | 0.0512 (15) | −0.0009 (11) | 0.0065 (11) | −0.0004 (12) |
N5 | 0.0528 (14) | 0.0433 (13) | 0.0492 (14) | 0.0012 (11) | 0.0088 (11) | 0.0015 (11) |
N6 | 0.0626 (16) | 0.0455 (14) | 0.0437 (13) | 0.0090 (12) | 0.0097 (12) | 0.0072 (11) |
N7 | 0.0433 (13) | 0.0543 (14) | 0.0451 (13) | 0.0074 (11) | 0.0058 (10) | −0.0027 (11) |
N8 | 0.0422 (13) | 0.0571 (15) | 0.0476 (14) | 0.0037 (11) | 0.0022 (10) | −0.0063 (11) |
N9 | 0.0477 (13) | 0.0472 (14) | 0.0454 (13) | 0.0040 (11) | 0.0007 (11) | 0.0004 (11) |
N10 | 0.0440 (13) | 0.0531 (14) | 0.0448 (13) | 0.0069 (11) | 0.0076 (10) | 0.0010 (11) |
C1 | 0.083 (3) | 0.081 (3) | 0.062 (2) | 0.013 (2) | 0.034 (2) | 0.001 (2) |
C2 | 0.068 (2) | 0.0515 (18) | 0.0476 (17) | −0.0029 (15) | 0.0201 (15) | −0.0016 (13) |
C3 | 0.092 (3) | 0.069 (2) | 0.0425 (17) | 0.002 (2) | 0.0194 (17) | −0.0003 (16) |
C4 | 0.077 (2) | 0.058 (2) | 0.0428 (17) | −0.0026 (17) | 0.0049 (16) | −0.0010 (14) |
C5 | 0.102 (3) | 0.105 (3) | 0.0439 (19) | 0.014 (3) | −0.005 (2) | 0.006 (2) |
C6 | 0.095 (3) | 0.085 (3) | 0.095 (3) | −0.012 (3) | 0.041 (3) | 0.022 (3) |
C7 | 0.068 (2) | 0.063 (2) | 0.065 (2) | −0.0081 (17) | 0.0233 (17) | 0.0013 (17) |
C8 | 0.063 (2) | 0.088 (3) | 0.087 (3) | −0.020 (2) | 0.032 (2) | −0.005 (2) |
C9 | 0.0462 (18) | 0.085 (3) | 0.073 (2) | −0.0031 (17) | 0.0143 (16) | −0.015 (2) |
C10 | 0.042 (2) | 0.167 (5) | 0.107 (4) | −0.002 (3) | −0.001 (2) | 0.011 (4) |
C11 | 0.081 (3) | 0.053 (2) | 0.071 (2) | −0.0135 (18) | 0.016 (2) | −0.0053 (17) |
C12 | 0.075 (2) | 0.0457 (17) | 0.0487 (17) | −0.0050 (16) | 0.0167 (16) | −0.0002 (14) |
C13 | 0.093 (3) | 0.0423 (17) | 0.065 (2) | 0.0041 (18) | 0.017 (2) | −0.0015 (16) |
C14 | 0.086 (3) | 0.0514 (18) | 0.0540 (19) | 0.0207 (18) | 0.0209 (18) | 0.0124 (15) |
C15 | 0.109 (3) | 0.079 (3) | 0.091 (3) | 0.045 (3) | 0.015 (3) | 0.013 (2) |
C16 | 0.069 (2) | 0.084 (3) | 0.064 (2) | 0.020 (2) | 0.0221 (19) | −0.001 (2) |
C17 | 0.0560 (18) | 0.060 (2) | 0.0492 (17) | 0.0090 (15) | 0.0106 (14) | −0.0003 (15) |
C18 | 0.068 (2) | 0.075 (2) | 0.0458 (18) | 0.0087 (19) | 0.0090 (16) | −0.0024 (16) |
C19 | 0.0547 (18) | 0.069 (2) | 0.0460 (17) | 0.0036 (16) | −0.0002 (14) | −0.0044 (15) |
C20 | 0.062 (2) | 0.115 (4) | 0.063 (2) | 0.016 (2) | −0.0099 (18) | −0.011 (2) |
C21 | 0.085 (3) | 0.050 (2) | 0.085 (3) | −0.009 (2) | −0.003 (2) | −0.003 (2) |
C22 | 0.067 (2) | 0.0434 (16) | 0.0527 (18) | 0.0017 (15) | 0.0069 (15) | 0.0021 (14) |
C23 | 0.077 (2) | 0.0462 (17) | 0.068 (2) | 0.0150 (17) | 0.0185 (18) | 0.0057 (16) |
C24 | 0.0571 (18) | 0.0566 (18) | 0.0516 (18) | 0.0141 (15) | 0.0153 (14) | 0.0050 (14) |
C25 | 0.060 (2) | 0.084 (3) | 0.087 (3) | 0.023 (2) | 0.020 (2) | 0.017 (2) |
B1 | 0.055 (2) | 0.057 (2) | 0.0445 (18) | 0.0105 (17) | 0.0045 (15) | 0.0072 (16) |
B2 | 0.0422 (18) | 0.060 (2) | 0.056 (2) | −0.0015 (16) | 0.0101 (15) | −0.0080 (17) |
Co1—N7 | 2.100 (3) | C2—C3 | 1.384 (5) |
Co1—H21B | 2.12 (3) | C3—C4 | 1.356 (5) |
Co1—N9 | 2.124 (3) | C3—H3 | 0.9300 |
Co1—N3 | 2.124 (3) | C4—C5 | 1.489 (5) |
Co1—N1 | 2.163 (3) | C5—H5A | 0.9600 |
Co1—N5 | 2.172 (3) | C5—H5B | 0.9600 |
F1—C1 | 1.333 (5) | C5—H5C | 0.9600 |
F2—C1 | 1.331 (4) | C6—C7 | 1.487 (6) |
F3—C1 | 1.316 (5) | C7—C8 | 1.376 (6) |
F4—C6 | 1.252 (6) | C8—C9 | 1.365 (6) |
F5—C6 | 1.293 (6) | C8—H8 | 0.9300 |
F6—C6 | 1.325 (6) | C9—C10 | 1.500 (6) |
F7—C11 | 1.315 (5) | C10—H10A | 0.9600 |
F8—C11 | 1.322 (4) | C10—H10B | 0.9600 |
F9—C11 | 1.295 (5) | C10—H10C | 0.9600 |
F10—C16 | 1.298 (5) | C11—C12 | 1.487 (5) |
F11—C16 | 1.324 (5) | C12—C13 | 1.373 (5) |
F12—C16 | 1.317 (5) | C13—C14 | 1.363 (6) |
F13—C21 | 1.321 (5) | C13—H13 | 0.9300 |
F14—C21 | 1.331 (5) | C14—C15 | 1.490 (6) |
F15—C21 | 1.303 (5) | C15—H15A | 0.9600 |
N1—C2 | 1.337 (4) | C15—H15B | 0.9600 |
N1—N2 | 1.364 (4) | C15—H15C | 0.9600 |
N2—C4 | 1.358 (4) | C16—C17 | 1.480 (5) |
N2—B1 | 1.538 (5) | C17—C18 | 1.375 (5) |
N3—C7 | 1.337 (4) | C18—C19 | 1.368 (5) |
N3—N4 | 1.360 (4) | C18—H18 | 0.9300 |
N4—C9 | 1.350 (4) | C19—C20 | 1.488 (5) |
N4—B1 | 1.538 (5) | C20—H20A | 0.9600 |
N5—C12 | 1.335 (4) | C20—H20B | 0.9600 |
N5—N6 | 1.370 (4) | C20—H20C | 0.9600 |
N6—C14 | 1.354 (4) | C21—C22 | 1.480 (5) |
N6—B1 | 1.547 (5) | C22—C23 | 1.381 (5) |
N7—C17 | 1.343 (4) | C23—C24 | 1.373 (5) |
N7—N8 | 1.359 (3) | C23—H23 | 0.9300 |
N8—C19 | 1.350 (4) | C24—C25 | 1.483 (5) |
N8—B2 | 1.551 (5) | C25—H25A | 0.9600 |
N9—C22 | 1.338 (4) | C25—H25B | 0.9600 |
N9—N10 | 1.358 (3) | C25—H25C | 0.9600 |
N10—C24 | 1.347 (4) | B1—H1B | 1.11 (3) |
N10—B2 | 1.546 (5) | B2—H21B | 1.16 (3) |
C1—C2 | 1.471 (5) | B2—H22B | 1.08 (4) |
N7—Co1—H21B | 72.2 (9) | C9—C10—H10A | 109.5 |
N7—Co1—N9 | 93.97 (10) | C9—C10—H10B | 109.5 |
H21B—Co1—N9 | 73.4 (9) | H10A—C10—H10B | 109.5 |
N7—Co1—N3 | 99.66 (10) | C9—C10—H10C | 109.5 |
H21B—Co1—N3 | 169.7 (9) | H10A—C10—H10C | 109.5 |
N9—Co1—N3 | 101.63 (10) | H10B—C10—H10C | 109.5 |
N7—Co1—N1 | 166.50 (10) | F9—C11—F7 | 106.3 (4) |
H21B—Co1—N1 | 98.7 (9) | F9—C11—F8 | 106.2 (4) |
N9—Co1—N1 | 92.81 (10) | F7—C11—F8 | 105.0 (4) |
N3—Co1—N1 | 90.37 (10) | F9—C11—C12 | 115.0 (3) |
N7—Co1—N5 | 89.25 (10) | F7—C11—C12 | 112.6 (3) |
H21B—Co1—N5 | 93.9 (9) | F8—C11—C12 | 111.2 (3) |
N9—Co1—N5 | 165.12 (10) | N5—C12—C13 | 111.5 (3) |
N3—Co1—N5 | 92.12 (10) | N5—C12—C11 | 123.5 (3) |
N1—Co1—N5 | 81.32 (10) | C13—C12—C11 | 125.0 (3) |
C2—N1—N2 | 105.2 (3) | C14—C13—C12 | 105.9 (3) |
C2—N1—Co1 | 140.2 (2) | C14—C13—H13 | 127.1 |
N2—N1—Co1 | 114.44 (18) | C12—C13—H13 | 127.1 |
C4—N2—N1 | 110.6 (3) | N6—C14—C13 | 107.4 (3) |
C4—N2—B1 | 128.4 (3) | N6—C14—C15 | 123.2 (4) |
N1—N2—B1 | 120.8 (2) | C13—C14—C15 | 129.4 (4) |
C7—N3—N4 | 104.9 (3) | C14—C15—H15A | 109.5 |
C7—N3—Co1 | 139.2 (2) | C14—C15—H15B | 109.5 |
N4—N3—Co1 | 115.93 (19) | H15A—C15—H15B | 109.5 |
C9—N4—N3 | 110.8 (3) | C14—C15—H15C | 109.5 |
C9—N4—B1 | 129.0 (3) | H15A—C15—H15C | 109.5 |
N3—N4—B1 | 120.0 (2) | H15B—C15—H15C | 109.5 |
C12—N5—N6 | 104.9 (3) | F10—C16—F12 | 107.6 (4) |
C12—N5—Co1 | 139.6 (2) | F10—C16—F11 | 107.4 (4) |
N6—N5—Co1 | 113.09 (19) | F12—C16—F11 | 103.1 (3) |
C14—N6—N5 | 110.3 (3) | F10—C16—C17 | 114.9 (3) |
C14—N6—B1 | 129.7 (3) | F12—C16—C17 | 112.0 (3) |
N5—N6—B1 | 119.7 (2) | F11—C16—C17 | 111.0 (4) |
C17—N7—N8 | 105.5 (2) | N7—C17—C18 | 110.9 (3) |
C17—N7—Co1 | 146.1 (2) | N7—C17—C16 | 122.6 (3) |
N8—N7—Co1 | 108.39 (18) | C18—C17—C16 | 126.2 (3) |
C19—N8—N7 | 110.2 (3) | C19—C18—C17 | 105.5 (3) |
C19—N8—B2 | 134.5 (3) | C19—C18—H18 | 127.2 |
N7—N8—B2 | 114.9 (2) | C17—C18—H18 | 127.2 |
C22—N9—N10 | 105.5 (2) | N8—C19—C18 | 107.9 (3) |
C22—N9—Co1 | 146.2 (2) | N8—C19—C20 | 122.8 (3) |
N10—N9—Co1 | 108.18 (18) | C18—C19—C20 | 129.3 (3) |
C24—N10—N9 | 111.0 (3) | C19—C20—H20A | 109.5 |
C24—N10—B2 | 133.8 (3) | C19—C20—H20B | 109.5 |
N9—N10—B2 | 115.2 (2) | H20A—C20—H20B | 109.5 |
F3—C1—F2 | 106.9 (4) | C19—C20—H20C | 109.5 |
F3—C1—F1 | 105.5 (4) | H20A—C20—H20C | 109.5 |
F2—C1—F1 | 106.2 (3) | H20B—C20—H20C | 109.5 |
F3—C1—C2 | 114.7 (3) | F15—C21—F13 | 107.5 (4) |
F2—C1—C2 | 110.7 (3) | F15—C21—F14 | 104.3 (4) |
F1—C1—C2 | 112.2 (4) | F13—C21—F14 | 105.2 (4) |
N1—C2—C3 | 110.6 (3) | F15—C21—C22 | 112.3 (4) |
N1—C2—C1 | 123.9 (3) | F13—C21—C22 | 114.2 (3) |
C3—C2—C1 | 125.4 (3) | F14—C21—C22 | 112.6 (4) |
C4—C3—C2 | 106.4 (3) | N9—C22—C23 | 110.6 (3) |
C4—C3—H3 | 126.8 | N9—C22—C21 | 122.9 (3) |
C2—C3—H3 | 126.8 | C23—C22—C21 | 126.4 (3) |
C3—C4—N2 | 107.1 (3) | C24—C23—C22 | 105.8 (3) |
C3—C4—C5 | 129.1 (3) | C24—C23—H23 | 127.1 |
N2—C4—C5 | 123.8 (3) | C22—C23—H23 | 127.1 |
C4—C5—H5A | 109.5 | N10—C24—C23 | 107.1 (3) |
C4—C5—H5B | 109.5 | N10—C24—C25 | 123.0 (3) |
H5A—C5—H5B | 109.5 | C23—C24—C25 | 129.9 (3) |
C4—C5—H5C | 109.5 | C24—C25—H25A | 109.5 |
H5A—C5—H5C | 109.5 | C24—C25—H25B | 109.5 |
H5B—C5—H5C | 109.5 | H25A—C25—H25B | 109.5 |
F4—C6—F5 | 108.3 (5) | C24—C25—H25C | 109.5 |
F4—C6—F6 | 108.8 (5) | H25A—C25—H25C | 109.5 |
F5—C6—F6 | 102.0 (4) | H25B—C25—H25C | 109.5 |
F4—C6—C7 | 115.3 (4) | N4—B1—N2 | 110.5 (3) |
F5—C6—C7 | 111.9 (5) | N4—B1—N6 | 109.8 (3) |
F6—C6—C7 | 109.6 (5) | N2—B1—N6 | 109.0 (3) |
N3—C7—C8 | 111.4 (3) | N4—B1—H1B | 108.1 (18) |
N3—C7—C6 | 124.1 (4) | N2—B1—H1B | 109.6 (18) |
C8—C7—C6 | 124.5 (4) | N6—B1—H1B | 109.8 (18) |
C9—C8—C7 | 105.6 (3) | N10—B2—N8 | 109.2 (3) |
C9—C8—H8 | 127.2 | N10—B2—H21B | 104.2 (17) |
C7—C8—H8 | 127.2 | N8—B2—H21B | 103.6 (17) |
N4—C9—C8 | 107.4 (3) | N10—B2—H22B | 110.1 (19) |
N4—C9—C10 | 123.0 (4) | N8—B2—H22B | 110.1 (19) |
C8—C9—C10 | 129.6 (4) | H21B—B2—H22B | 119 (3) |
N7—Co1—N1—C2 | −78.5 (5) | N4—N3—C7—C8 | 0.1 (4) |
H21B—Co1—N1—C2 | −32.0 (10) | Co1—N3—C7—C8 | 179.3 (3) |
N9—Co1—N1—C2 | 41.6 (3) | N4—N3—C7—C6 | 178.6 (4) |
N3—Co1—N1—C2 | 143.3 (3) | Co1—N3—C7—C6 | −2.2 (7) |
N5—Co1—N1—C2 | −124.6 (3) | F4—C6—C7—N3 | 8.4 (7) |
N7—Co1—N1—N2 | 97.9 (4) | F5—C6—C7—N3 | −116.0 (5) |
H21B—Co1—N1—N2 | 144.4 (9) | F6—C6—C7—N3 | 131.6 (5) |
N9—Co1—N1—N2 | −142.0 (2) | F4—C6—C7—C8 | −173.3 (5) |
N3—Co1—N1—N2 | −40.3 (2) | F5—C6—C7—C8 | 62.3 (7) |
N5—Co1—N1—N2 | 51.8 (2) | F6—C6—C7—C8 | −50.1 (6) |
C2—N1—N2—C4 | −0.2 (3) | N3—C7—C8—C9 | −0.4 (5) |
Co1—N1—N2—C4 | −177.8 (2) | C6—C7—C8—C9 | −178.8 (4) |
C2—N1—N2—B1 | 175.2 (3) | N3—N4—C9—C8 | −0.5 (4) |
Co1—N1—N2—B1 | −2.4 (3) | B1—N4—C9—C8 | 175.0 (3) |
N7—Co1—N3—C7 | 49.1 (4) | N3—N4—C9—C10 | 179.7 (4) |
H21B—Co1—N3—C7 | 13 (5) | B1—N4—C9—C10 | −4.8 (6) |
N9—Co1—N3—C7 | −47.0 (4) | C7—C8—C9—N4 | 0.5 (5) |
N1—Co1—N3—C7 | −140.0 (4) | C7—C8—C9—C10 | −179.7 (5) |
N5—Co1—N3—C7 | 138.7 (4) | N6—N5—C12—C13 | −1.3 (4) |
N7—Co1—N3—N4 | −131.7 (2) | Co1—N5—C12—C13 | 158.4 (3) |
H21B—Co1—N3—N4 | −168 (5) | N6—N5—C12—C11 | 176.0 (3) |
N9—Co1—N3—N4 | 132.1 (2) | Co1—N5—C12—C11 | −24.4 (5) |
N1—Co1—N3—N4 | 39.2 (2) | F9—C11—C12—N5 | 86.5 (5) |
N5—Co1—N3—N4 | −42.1 (2) | F7—C11—C12—N5 | −35.4 (5) |
C7—N3—N4—C9 | 0.3 (4) | F8—C11—C12—N5 | −152.9 (3) |
Co1—N3—N4—C9 | −179.2 (2) | F9—C11—C12—C13 | −96.6 (5) |
C7—N3—N4—B1 | −175.7 (3) | F7—C11—C12—C13 | 141.5 (4) |
Co1—N3—N4—B1 | 4.8 (4) | F8—C11—C12—C13 | 24.0 (5) |
N7—Co1—N5—C12 | −30.5 (3) | N5—C12—C13—C14 | 0.5 (4) |
H21B—Co1—N5—C12 | 41.5 (10) | C11—C12—C13—C14 | −176.7 (3) |
N9—Co1—N5—C12 | 72.2 (5) | N5—N6—C14—C13 | −1.3 (4) |
N3—Co1—N5—C12 | −130.2 (3) | B1—N6—C14—C13 | 172.8 (3) |
N1—Co1—N5—C12 | 139.8 (3) | N5—N6—C14—C15 | 179.5 (4) |
N7—Co1—N5—N6 | 128.0 (2) | B1—N6—C14—C15 | −6.4 (6) |
H21B—Co1—N5—N6 | −159.9 (9) | C12—C13—C14—N6 | 0.5 (4) |
N9—Co1—N5—N6 | −129.3 (4) | C12—C13—C14—C15 | 179.6 (4) |
N3—Co1—N5—N6 | 28.4 (2) | N8—N7—C17—C18 | 0.3 (4) |
N1—Co1—N5—N6 | −61.7 (2) | Co1—N7—C17—C18 | −176.5 (3) |
C12—N5—N6—C14 | 1.6 (3) | N8—N7—C17—C16 | −174.5 (3) |
Co1—N5—N6—C14 | −164.2 (2) | Co1—N7—C17—C16 | 8.7 (7) |
C12—N5—N6—B1 | −173.2 (3) | F10—C16—C17—N7 | −0.7 (6) |
Co1—N5—N6—B1 | 21.0 (3) | F12—C16—C17—N7 | −123.9 (4) |
H21B—Co1—N7—C17 | −156.8 (10) | F11—C16—C17—N7 | 121.4 (4) |
N9—Co1—N7—C17 | 132.1 (4) | F10—C16—C17—C18 | −174.6 (4) |
N3—Co1—N7—C17 | 29.6 (4) | F12—C16—C17—C18 | 62.2 (6) |
N1—Co1—N7—C17 | −107.9 (5) | F11—C16—C17—C18 | −52.5 (5) |
N5—Co1—N7—C17 | −62.4 (4) | N7—C17—C18—C19 | 0.1 (4) |
H21B—Co1—N7—N8 | 26.5 (10) | C16—C17—C18—C19 | 174.6 (4) |
N9—Co1—N7—N8 | −44.6 (2) | N7—N8—C19—C18 | 0.6 (4) |
N3—Co1—N7—N8 | −147.1 (2) | B2—N8—C19—C18 | −171.6 (4) |
N1—Co1—N7—N8 | 75.4 (5) | N7—N8—C19—C20 | 179.7 (4) |
N5—Co1—N7—N8 | 120.8 (2) | B2—N8—C19—C20 | 7.5 (6) |
C17—N7—N8—C19 | −0.5 (4) | C17—C18—C19—N8 | −0.4 (4) |
Co1—N7—N8—C19 | 177.6 (2) | C17—C18—C19—C20 | −179.5 (4) |
C17—N7—N8—B2 | 173.4 (3) | N10—N9—C22—C23 | −0.1 (4) |
Co1—N7—N8—B2 | −8.5 (3) | Co1—N9—C22—C23 | −175.9 (3) |
N7—Co1—N9—C22 | −134.0 (4) | N10—N9—C22—C21 | 178.1 (3) |
H21B—Co1—N9—C22 | 155.9 (10) | Co1—N9—C22—C21 | 2.3 (6) |
N3—Co1—N9—C22 | −33.3 (4) | F15—C21—C22—N9 | −137.6 (4) |
N1—Co1—N9—C22 | 57.6 (4) | F13—C21—C22—N9 | −14.9 (6) |
N5—Co1—N9—C22 | 123.8 (5) | F14—C21—C22—N9 | 105.1 (4) |
N7—Co1—N9—N10 | 50.21 (19) | F15—C21—C22—C23 | 40.3 (6) |
H21B—Co1—N9—N10 | −19.8 (10) | F13—C21—C22—C23 | 163.0 (4) |
N3—Co1—N9—N10 | 150.93 (18) | F14—C21—C22—C23 | −77.1 (5) |
N1—Co1—N9—N10 | −118.11 (19) | N9—C22—C23—C24 | 0.6 (4) |
N5—Co1—N9—N10 | −51.9 (5) | C21—C22—C23—C24 | −177.5 (4) |
C22—N9—N10—C24 | −0.5 (3) | N9—N10—C24—C23 | 0.8 (4) |
Co1—N9—N10—C24 | 177.1 (2) | B2—N10—C24—C23 | 178.0 (3) |
C22—N9—N10—B2 | −178.2 (3) | N9—N10—C24—C25 | −177.5 (3) |
Co1—N9—N10—B2 | −0.6 (3) | B2—N10—C24—C25 | −0.3 (6) |
N2—N1—C2—C3 | −0.1 (4) | C22—C23—C24—N10 | −0.8 (4) |
Co1—N1—C2—C3 | 176.5 (3) | C22—C23—C24—C25 | 177.3 (4) |
N2—N1—C2—C1 | 178.3 (3) | C9—N4—B1—N2 | 121.5 (4) |
Co1—N1—C2—C1 | −5.1 (6) | N3—N4—B1—N2 | −63.3 (4) |
F3—C1—C2—N1 | 34.6 (5) | C9—N4—B1—N6 | −118.2 (4) |
F2—C1—C2—N1 | 155.7 (4) | N3—N4—B1—N6 | 57.0 (4) |
F1—C1—C2—N1 | −85.9 (5) | C4—N2—B1—N4 | −124.1 (3) |
F3—C1—C2—C3 | −147.2 (4) | N1—N2—B1—N4 | 61.4 (4) |
F2—C1—C2—C3 | −26.2 (6) | C4—N2—B1—N6 | 115.1 (3) |
F1—C1—C2—C3 | 92.3 (5) | N1—N2—B1—N6 | −59.4 (4) |
N1—C2—C3—C4 | 0.3 (4) | C14—N6—B1—N4 | 112.3 (4) |
C1—C2—C3—C4 | −178.1 (4) | N5—N6—B1—N4 | −74.1 (3) |
C2—C3—C4—N2 | −0.4 (4) | C14—N6—B1—N2 | −126.5 (3) |
C2—C3—C4—C5 | 178.7 (4) | N5—N6—B1—N2 | 47.1 (4) |
N1—N2—C4—C3 | 0.3 (4) | C24—N10—B2—N8 | 111.9 (4) |
B1—N2—C4—C3 | −174.6 (3) | N9—N10—B2—N8 | −71.0 (3) |
N1—N2—C4—C5 | −178.7 (4) | C19—N8—B2—N10 | −109.7 (4) |
B1—N2—C4—C5 | 6.3 (6) | N7—N8—B2—N10 | 78.3 (3) |
Experimental details
Crystal data | |
Chemical formula | [Co(C10H10BF6N4)(C15H13BF9N6)] |
Mr | 829.08 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 298 |
a, b, c (Å) | 18.593 (2), 12.1167 (13), 30.720 (3) |
β (°) | 102.721 (2) |
V (Å3) | 6751.1 (13) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.63 |
Crystal size (mm) | 0.28 × 0.24 × 0.12 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Blessing, 1995) |
Tmin, Tmax | 0.875, 1.00 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 32390, 7431, 5522 |
Rint | 0.032 |
(sin θ/λ)max (Å−1) | 0.641 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.059, 0.167, 1.00 |
No. of reflections | 7431 |
No. of parameters | 495 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.69, −0.32 |
Computer programs: SMART WNT/2000 (Bruker, 2000), SAINT-Plus (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEPIII (Burnett & Johnson, 1996) and ORTEP-32 (Farrugia, 1997), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
Co1—N7 | 2.100 (3) | Co1—N3 | 2.124 (3) |
Co1—H21B | 2.12 (3) | Co1—N1 | 2.163 (3) |
Co1—N9 | 2.124 (3) | Co1—N5 | 2.172 (3) |
Cg1, Cg2, Cg3 and Cg4 are the centroids of the N3/N4/C9/C8/C7, N5/N6/C14/C13/C12, N7/N8/C19/C18/C17 and N9/N10/C24/C23/C22 rings, respectively. |
C—F···Cg | C—F | F···Cg | C···Cg | C—F···Cg |
C1—F1···Cg4 | 1.333 (5) | 3.319 (4) | 3.798 (5) | 100.7 (3) |
C1—F2···Cg2i | 1.331 (4) | 3.341 (3) | 4.565 (4) | 152.6 (2) |
C1—F3···Cg4 | 1.316 (5) | 3.273 (3) | 3.798 (5) | 103.3 (3) |
C11—F9···Cg3 | 1.295 (5) | 3.025 (4) | 3.826 (4) | 119.1 (3) |
C16—F10···Cg1 | 1.298 (5) | 3.252 (4) | 4.279 (4) | 135.8 (3) |
C16—F10···Cg2 | 1.298 (5) | 3.208 (3) | 4.061 (4) | 122.8 (2) |
C16—F11···Cg4ii | 1.324 (5) | 3.605 (4) | 4.467 (4) | 123.0 (3) |
C21—F13···Cg1 | 1.321 (5) | 3.373 (3) | 4.346 (5) | 130.3 (3) |
Symmetry codes: (i) 1/2-x, 3/2-y, -z; (ii) 1/2-x, 1/2+y, 1/2-z. |
Acknowledgements
Any acknowledgements?
References
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Our long-term interest in the synthesis and applications of nitrogen-containing heterocyles, such as expanded-ring imidazoles, and their complexes with metal ions (Stibrany & Potenza, 2009a) led us to prepare the title compound (I). With pyrazole, a variety of metal complexes has been prepared, predominantly with copper (Stibrany & Potenza, 2006), including the Cu(II) complex of an unusual (dimethylamino)methane bridged bis(pyrazole) ligand formed via a DMF aminalization (Stibrany et al., 1999) and a novel binuclear µ-oxalato(1-benzylpyrazole)2(CF3SO3)2copper(II) compound resulting from the fixation of carbon dioxide (Stibrany et al., 2005). A tris(pyrazolyl)arene ligand which forms geometrically constrained metal complexes has also been prepared (Stibrany et al., 2006), as has a sterically strained trigonal-bipyramidal Cu(II) complex containing a 1-benzylpyrazole ligand (Stibrany & Potenza, 2009b). Copper and cobalt complexes utlizing the title ligand were prepared for oxidation studies (Gorun et al., 2000).
Compound (I) (Fig. 1) contains a central Co(II) ion linked to a Tp and a Bp ligand. Ligation is effected by three imine N atoms of the Tp ligand, two imine N atoms of the Bp ligand, and an H atom which participates in a two-electron, three-center B—H···Co bond. The result is a distorted octahedral coordination geometry. Compound (I) is a polymorph of a previously reported structure of the same compound (II) (Stibrany & Potenza, 2010). The present polymorph was the result of a ligand displacement reaction in which a Tp ligand was added to a preformed Co(Bp)2 complex to form (I).
A number of cobalt(II) complexes containing mixed bis (Bp)- and tris pyrazolylborates (Tp) and C—H···Co agostic interactions have been reported, with H···Co distances ranging from 2.03 Å (Ruman et al., 2002), 2.035 Å (Ruman et al., 2001) to 2.334 Å (Siemer et al., 2001). The H···Co distance in (I), 2.12 (3) Å, lies between these two extremes. Infrared spectral results also support the existence of an agostic 2-electron, 3-center bond in (I). B—H stretching vibrations for BH2 groups in which one of the H atoms is involved in a 2-electron, 3-center bond with a metal ion typically lie in the range 2100–2500 cm-1, with the lower value corresponding to the agostic interaction (Ghosh et al., 1998). In (I), IR bands at 2570 and 2492 cm-1 are assigned as free B—H stretching vibrations, while the band at 2217 cm-1 is assigned to the bound B—H group.
The coordination geometries of both polymorphs are similar: in both, the largest deviations from octahedral symmetry are found with the H—Co—N angles associated with the bound hydrogen atom. The polymorphs differ fundamentally in the behavior of the trifluoromethyl groups. In the first polymorph, the molecules formed layers linked by intermolecular C—H···F hydrogen bonds in such a way as to form chains along the a cell direction. In contrast, the current polymorph exhibits no such hydrogen bonds; rather PLATON (Spek, 2009) reveals six intramolecular and two intermolecular C—F···Cg interactions (Table 2).