Crystal structure of 3-ferrocenyl-1-phenyl-1H-pyrrole, [Fe(η5-C5H4cC4H3NPh)(η5-C5H5)]

Pfaff, U.; Korb, M.; Lang, H.

doi:10.1107/S2056989015024214

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Volume 72| Part 1| January 2016| Pages 92-95

doi:10.1107/S2056989015024214

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Crystal structure of 3-ferrocenyl-1-phenyl-1H-pyrrole, [Fe(η⁵-C₅H₄^cC₄H₃NPh)(η⁵-C₅H₅)]

Ulrike Pfaff,^a Marcus Korb ^a and Heinrich Lang ^a ^*

^aTechnische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Anorganische Chemie, D-09107 Chemnitz, Germany
^*Correspondence e-mail: heinrich.lang@chemie.tu-chemnitz.de

Edited by M. Weil, Vienna University of Technology, Austria (Received 2 December 2015; accepted 16 December 2015; online 1 January 2016)

The molecular structure of the title compound, [Fe(C₅H₅)(C₁₅H₁₂N)], consists of a ferrocene moiety with an N-phenylpyrrole heterocycle bound to one cyclopentadienyl ring. The 1,3-disubstitution of the pyrrole results in an L-shaped arrangement of the molecule with plane intersections of 2.78 (17)° between the pyrrole and the N-bonded phenyl ring and of 8.17 (18)° between the pyrrole and the cyclopentadienyl ring. In the crystal, no remarkable intermolecular interactions are observed

Keywords: crystal structure; ferrocene; pyrrole; Negishi C,C cross-coupling.

CCDC reference: 1442943

1. Chemical context

Ferrocenyl-substituted pyrroles have been investigated in electron-transfer studies (for example, see: Hildebrandt et al., 2011a ,b ; Hildebrandt & Lang, 2011 , 2013 ; Pfaff et al., 2013 , 2015a ; Korb et al., 2014 ; Yu-Qiang et al., 2015 ), demonstrating that pyrroles are well suited to examine intramolecular metal–metal interactions in mixed-valent species, when compared to other heterocycles such as furan, thiophene, phosphole or siloles (Hildebrandt et al., 2013, 2011; Pfaff et al., 2015a,b ; Lehrich et al., 2014 ; Miesel et al., 2013 , 2015 ; Speck et al., 2012a , 2014 , 2015 ). As has been shown in the study of 3,4-diferrocenyl pyrroles [3,4-Fc₂-^cC₄H₂NR; Fc = Fe(η⁵-C₅H₄)(η⁵-C₅H₅); R = Ph, SO₂-4-MeC₆H₄, SiⁱPr₃; Korb et al., 2014; Goetsch et al., 2014 ], the compounds showed a low degree of delocalization between the formal C,C double and C,C single bonds, in contrast to 2,5-substituted pyrroles (Korb et al., 2014). In addition, these compounds exhibit rather weak, broad inter-valence charge-transfer transitions in spectro-electrochemical investigations in the NIR region of the mixed-valent species. Lower redox splittings were also detected for such compounds. These results indicate that in mono-oxidized 3,4-diferrocenyl-substituted pyrroles the intramolecular electron transfer is quite weak. In a continuation of this work, we present herein the synthesis and crystal structure of 3-ferrocenyl-N-phenylpyrrole, (I), [Fe(η⁵-C₅H₄^cC₄H₃NPh)(η⁵-C₅H₅)]. The synthesis of this compound was realized using typical Negishi C,C cross-coupling reaction conditions.

2. Structural commentary

The 1,3-disubstitution of the pyrrole ring in compound (I) results in an L-type shape of the molecule with a bending of 34.882 (2)° of the three catenated ring systems, as calculated by the angle between the centroids of the respective cyclopentadienyl, pyrrole and phenyl rings. The three rings are nearly coplanar, with plane intersections of 8.17 (18)° between the central pyrrole ring with the cyclopentadienyl ring and of 2.78 (17)° between the pyrrole ring and the N-bound phenyl ring (Fig. 1). The ferrocenyl substituent itself exhibits a nearly eclipsed conformation with a torsion angle of −12.2 (2)°. The 3-substitution affects the lengths of the C=C bonds in the pyrrole ring, resulting in a shortening to 1.349 (4) Å of the H3C3=C4H4 bond compared to 1.378 (4) Å for the C2=C1H1 bond. However, the unsymmetrical substitution pattern does not significantly affect the C—N bonds of the pyrrole ring system.

Figure 1
The molecular structure of (I)

, with displacement ellipsoids drawn at the 50% probability level. All H atoms have been omitted for clarity.

3. Supramolecular features

In the crystal packing of (I), the N-phenylpyrrole moieties are directed along [ $[\overline{1}]$ 01] with alternating directions for adjacent rows (Fig. 2). The bent shape caused by the 3-substitution pattern furthermore results in a corrugated arrangement of the molecules along [001] (Fig. 3). Interestingly, no remarkable intra- or intermolecular interactions, e.g. in the form of π–π interactions, are observed. Therefore it appears that the crystal packing is mainly dominated by van der Waals forces.

Figure 2
Packing of the molecules in the crystal structure of (I)

in a view along [010]. All H atoms have been omitted for clarity.

Figure 3
Packing of the molecules in the crystal structure of (I)

resulting in a wave-type arrangement along [001]. All H atoms have been omitted for clarity.

4. Database survey

A CSD database search (Groom & Allen, 2014 ) for 3-ferrocenyl five-membered aromatics gave eleven results with seven of them disubstituted in the 3- and 4-positions including thiophenes, like the super-crowded 3,3′,4,4′,5,5′-hexaferrocenyl-2,2′-bithiophene (Speck et al., 2012b ), 2,3,4,5-tetrakis(ferrocenyl)thiophene (Hildebrandt et al., 2010 ) and also 1,1′-disubstituted ferrocenes bearing a 3-thienyl and a 3,5-bis(trifluoromethyl)phenyl substituent (Poppitz et al., 2014 ). 1,3-Disubstituted thiophenes are also reported (Speck et al., 2012a) due to the easy accessibility of each position. However, the 3- (and 4-) substitution of pyrroles is rather difficult, requiring sterically demanding N-substituents to block the 2- and 5-positions, e.g. N-triisopropylsilyl (Korb et al., 2014; Goetsch et al., 2014) or deactivating p-toluenesulfonyl substituents (Korb et al., 2014). Thus, several multiple ferrocenyl structures are known, including the super-crowded 2,3,4,5-tetraferrocenyl pyrrole bearing either an N-Me (Hildebrandt et al., 2011a) or N-Ph substituent (Hildebrandt et al., 2011b).

However, a single substituted pyrrole bearing just one ferrocenyl substituent in the 3-position has not been reported so far. It should be noted that related structures like 3-ferrocenyl maleimides (Mathur et al., 2012 ) and a 3-ferrocenyl boron-dipyrromethene (Dhokale et al., 2013 ) are reported bearing one ferrocenyl substituent.

Comparing the plane intersections between the ferrocenyl and the pyrrolic ring systems, compound (I) exhibits the most coplanar torsion of 8.17 (18)° followed by 3,4-diferrocenyl-N-tosyl pyrrole (Korb et al., 2014) with 19.855 (6)° or, in the case of maleimides, the 3-bromo-4-ferrocenyl-N-phenyl-derivative with 9.8° (Hildebrandt et al., 2012 ).

The smallest intersection between the phenyl and pyrrole rings are reported with 5.4° for a 3-ferrocenyl-pyrrolo[1,2-a]quinoxaline (Guillon et al., 2011 ), due to the hindered rotation of the N—C_Ph bond. However, comparable derivatives with free rotable N-aromatics exhibit torsions above 35° (Hildebrandt et al., 2012).

5. Synthesis and crystallization

3-Bromo-N-phenylpyrrole was prepared from 2-bromo-N-phenylpyrrole according to the synthetic methodology reported by Choi et al. (1998 ). The synthesis of ferrocenyl pyrrole (I) was realized using typical Negishi C,C cross-coupling reaction conditions by reacting ferrocenyl zinc chloride with 3-bromo-N-phenylpyrrole (Negishi et al., 1977 ).

Synthesis of (I): Ferrocene (0.35 g, 1.88 mmol) and 0.125 eq of KO^tBu (0.03 g, 0.23 mmol) were dissolved in 20 ml of tetrahydrofuran and the respective solution was cooled to 193 K. Afterwards, 2 eq of ^tbutyllithium (2.4 ml, 3.76 mmol, 1.6 M in ⁿpentane) were added dropwise via a syringe and the reaction solution was stirred for 1 h. Then, 1 eq of [ZnCl₂·2thf] (0.53 g, 1.88 mmol) was added in a single portion. The reaction mixture was stirred for additional 30 min at 273 K. Afterwards, 0.25 mol-% of [Pd(CH₂C(CH₃)₂P(^tC₄H₉)₂)(μ-Cl)]₂ (3.2 mg, 0.47 mmol) and 3-bromo-N-phenylpyrrole (0.27 g, 1.24 mmol) were added in a single portion and stirring was continued overnight at 333–343 K. After evaporation of all volatiles, the crude product was worked-up by column chromatography (silica, column size: 1.5 x 10 cm) using an n-hexane/diethyl ether mixture (ratio 10:1; v/v) as the eluent. The first fraction contained ferrocene, while thereafter compound (I) was eluted as an orange phase. Single crystals of (I), suitable for single crystal diffraction analysis, were obtained by slow evaporation of a saturated dichloromethane/methanol (ratio 1:1 v/v) solution containing (I) at ambient temperature. Yield: 0.16 g (0.48 mmol, 39% based on 3-bromo-N-phenylpyrrole). IR data [KBr, cm⁻¹] ν: 749 (s, δ _o.o.p.=C—H), 1512 (s, ν_C=C), 1599 (m, ν_C=C), 3055, 3084 (w, ν_=C—H). ¹H NMR (CDCl₃, p.p.m.) δ: 4.08 (s, 5 H, C₅H₅), 4.21 (pt, ³⁺⁴J_H,H = 1.90 Hz, 2 H, C₅H₄), 4.48 (pt, ³⁺⁴J_H,H = 1.90 Hz, 2 H, C₅H₄), 6.44 (dd, ³J_H4,H5 = 2.9 Hz, ⁴J_H4,H2 = 1.7 Hz, 1 H, H-4), 7.05 (dd, ³J_H5,H4 = 2.8 Hz, ⁴J_H5,H2 = 2.3 Hz, 1 H, H-5), 7.12 (dd, ⁴J_H2,H5 = 2.3 Hz, ⁴J_H2,H4 = 1.7 Hz, 1 H, H-2), 7.22–7.25 (m, 1 H, C₆H₅/p-H), 7.40–7.45 (m, 4 H, C₆H₅). ¹³C{¹H} NMR (CDCl₃, p.p.m.) δ: 66.19 (C₅H₄), 67.86 (C₅H₄), 69.60 (C₅H₅), 81.82 (C_i-C₅H₄), 109.97 (C-4), 115.32 (C-2), 119.58 (C-5), 120.10 (C₆H₅), 124.07 (C_i-C-3), 125.50 (C₆H₅), 129.70 (C₆H₅), 140.70 (C_i-C₆H₅). HR–ESI–MS (m/z): calculated for C₂₀H₁₇NFe: 327.0705, found: 327.0715 (M)⁺. Analysis calculated for C₂₀H₁₇NFe (327.20 g/mol) (%): C, 73.41; H, 5.24; N, 4.28; found: C, 72.99; H, 5.31; N, 4.10. Mp.: 401 K. CV (mV): E°′ = −123, ΔE_p = 74 (potentials vs FcH/FcH⁺).

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 1. C-bonded aromatic hydrogen atoms were placed in calculated positions and constrained to ride on their parent atoms with U_iso(H) = 1.2U_eq(C) and a C—H distance of 0.93 Å.

Table 1
Experimental details

Crystal data
Chemical formula	[Fe(C₅H₅)(C₁₅H₁₂N)]
M_r	327.19
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	110
a, b, c (Å)	10.9173 (8), 5.8011 (6), 23.085 (2)
β (°)	93.160 (7)
V (Å³)	1459.8 (2)
Z	4
Radiation type	Mo Kα
μ (mm⁻¹)	1.03
Crystal size (mm)	0.2 × 0.1 × 0.1

Data collection
Diffractometer	Oxford Gemini S
Absorption correction	Multi-scan (CrysAlis RED; Oxford Diffraction, 2006 $[Oxford Diffraction (2006). CrysAlis CCD and CrysAlis RED. Oxford Diffraction, Abingdon, England.]$ )
T_min, T_max	0.192, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	6054, 2858, 2198
R_int	0.047
(sin θ/λ)_max (Å⁻¹)	0.617

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.045, 0.110, 1.02
No. of reflections	2858
No. of parameters	199
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.50, −0.75
Computer programs: CrysAlis CCD and CrysAlis RED (Oxford Diffraction, 2006 $[Oxford Diffraction (2006). CrysAlis CCD and CrysAlis RED. Oxford Diffraction, Abingdon, England.]$ ), SHELXS97 and SHELXTL (Sheldrick, 2008 ), SHELXL2014 (Sheldrick, 2015 ), ORTEP-3 for Windows and WinGX (Farrugia, 2012 ) and publCIF (Westrip, 2010 ).

Supporting information

CCDC reference: 1442943

Crystal structure: contains datablock I. DOI: 10.1107/S2056989015024214/wm5252sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S2056989015024214/wm5252Isup2.hkl

checkCIF report

Computing details top

Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell refinement: CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED (Oxford Diffraction, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and SHELXTL (Sheldrick, 2008); software used to prepare material for publication: WinGX (Farrugia, 2012) and publCIF (Westrip, 2010).

3-Ferrocenyl-1-phenyl-1H-pyrrole top

Crystal data top

[Fe(C₅H₅)(C₁₅H₁₂N)]	F(000) = 680
M_r = 327.19	D_x = 1.489 Mg m⁻³
Monoclinic, P2₁/n	Mo Kα radiation, λ = 0.71073 Å
a = 10.9173 (8) Å	Cell parameters from 1838 reflections
b = 5.8011 (6) Å	θ = 4.0–28.3°
c = 23.085 (2) Å	µ = 1.03 mm⁻¹
β = 93.160 (7)°	T = 110 K
V = 1459.8 (2) Å³	Plate, orange
Z = 4	0.2 × 0.1 × 0.1 mm

Data collection top

Oxford Gemini S diffractometer	2198 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.047
Graphite monochromator	θ_max = 26.0°, θ_min = 3.2°
/w scans	h = −13→10
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2006)	k = −6→7
T_min = 0.192, T_max = 1.000	l = −28→25
6054 measured reflections	2 standard reflections every 50 reflections
2858 independent reflections	intensity decay: none

Refinement top

Refinement on F²	0 restraints
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.045	H-atom parameters constrained
wR(F²) = 0.110	w = 1/[σ²(F_o²) + (0.0503P)²] where P = (F_o² + 2F_c²)/3
S = 1.02	(Δ/σ)_max = 0.001
2858 reflections	Δρ_max = 0.50 e Å⁻³
199 parameters	Δρ_min = −0.75 e Å⁻³

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 > 2sigma(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
C1	0.5499 (3)	0.1196 (5)	0.24155 (12)	0.0173 (6)
H1	0.5176	0.2615	0.2298	0.021*
C2	0.5435 (3)	0.0236 (5)	0.29591 (12)	0.0165 (6)
C3	0.6066 (3)	−0.1911 (5)	0.29421 (13)	0.0201 (7)
H3	0.6183	−0.2940	0.3249	0.024*
C4	0.6466 (3)	−0.2195 (5)	0.24043 (12)	0.0195 (7)
H4	0.6901	−0.3461	0.2278	0.023*
C5	0.4917 (3)	0.1248 (5)	0.34651 (13)	0.0165 (6)
C6	0.4859 (3)	0.0136 (5)	0.40182 (12)	0.0186 (7)
H6	0.5099	−0.1371	0.4103	0.022*
C7	0.4375 (3)	0.1710 (5)	0.44135 (13)	0.0217 (7)
H7	0.4251	0.1424	0.4802	0.026*
C8	0.4112 (3)	0.3799 (5)	0.41138 (13)	0.0203 (7)
H8	0.3783	0.5122	0.4272	0.024*
C9	0.4436 (3)	0.3527 (5)	0.35336 (13)	0.0195 (7)
H9	0.4352	0.4640	0.3244	0.023*
C10	0.2029 (3)	−0.0235 (6)	0.30801 (14)	0.0249 (7)
H10	0.2257	−0.0582	0.2708	0.030*
C11	0.2121 (3)	−0.1733 (5)	0.35651 (15)	0.0281 (8)
H11	0.2417	−0.3236	0.3566	0.034*
C12	0.1686 (3)	−0.0549 (6)	0.40452 (15)	0.0302 (8)
H12	0.1649	−0.1128	0.4419	0.036*
C13	0.1314 (3)	0.1681 (5)	0.38567 (14)	0.0258 (8)
H13	0.0985	0.2822	0.4085	0.031*
C14	0.1533 (3)	0.1862 (5)	0.32592 (13)	0.0241 (7)
H14	0.1375	0.3148	0.3026	0.029*
C15	0.6417 (3)	0.0084 (5)	0.14879 (13)	0.0183 (7)
C16	0.6046 (3)	0.2088 (5)	0.12047 (13)	0.0259 (7)
H16	0.5595	0.3184	0.1396	0.031*
C17	0.6347 (3)	0.2466 (6)	0.06357 (14)	0.0332 (8)
H17	0.6088	0.3811	0.0447	0.040*
C18	0.7025 (3)	0.0869 (6)	0.03478 (15)	0.0315 (8)
H18	0.7229	0.1129	−0.0033	0.038*
C19	0.7393 (3)	−0.1117 (6)	0.06342 (14)	0.0308 (8)
H19	0.7850	−0.2204	0.0443	0.037*
C20	0.7101 (3)	−0.1529 (5)	0.11972 (13)	0.0254 (8)
H20	0.7359	−0.2881	0.1383	0.030*
N1	0.6125 (2)	−0.0310 (4)	0.20734 (10)	0.0172 (5)
Fe1	0.31350 (4)	0.11585 (7)	0.37338 (2)	0.01626 (16)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0098 (15)	0.0181 (14)	0.0240 (17)	0.0015 (13)	0.0006 (12)	−0.0006 (12)
C2	0.0070 (14)	0.0192 (15)	0.0232 (16)	−0.0028 (12)	−0.0017 (12)	0.0033 (12)
C3	0.0102 (15)	0.0227 (15)	0.0271 (17)	−0.0025 (13)	−0.0020 (13)	0.0043 (13)
C4	0.0098 (15)	0.0177 (14)	0.0306 (17)	0.0029 (13)	−0.0015 (13)	0.0014 (13)
C5	0.0051 (14)	0.0218 (15)	0.0227 (16)	−0.0020 (12)	0.0006 (12)	0.0030 (13)
C6	0.0096 (15)	0.0242 (16)	0.0216 (16)	−0.0006 (13)	−0.0035 (12)	0.0042 (13)
C7	0.0140 (16)	0.0309 (17)	0.0196 (16)	−0.0016 (14)	−0.0042 (13)	−0.0010 (13)
C8	0.0142 (16)	0.0216 (15)	0.0246 (16)	−0.0006 (13)	−0.0026 (13)	−0.0019 (13)
C9	0.0098 (15)	0.0222 (16)	0.0267 (17)	−0.0023 (13)	0.0016 (13)	0.0042 (13)
C10	0.0094 (16)	0.0397 (19)	0.0251 (17)	−0.0013 (15)	−0.0034 (13)	−0.0053 (15)
C11	0.0120 (16)	0.0218 (16)	0.050 (2)	−0.0024 (14)	−0.0049 (16)	−0.0019 (15)
C12	0.0154 (17)	0.045 (2)	0.0299 (19)	−0.0096 (16)	−0.0031 (14)	0.0086 (16)
C13	0.0083 (15)	0.0350 (19)	0.0342 (19)	−0.0024 (14)	0.0040 (14)	−0.0093 (15)
C14	0.0115 (16)	0.0283 (16)	0.0319 (18)	−0.0019 (14)	−0.0049 (14)	0.0060 (14)
C15	0.0052 (14)	0.0260 (16)	0.0236 (16)	−0.0037 (13)	−0.0008 (12)	−0.0020 (13)
C16	0.0182 (17)	0.0286 (17)	0.0312 (18)	0.0062 (15)	0.0040 (14)	0.0016 (15)
C17	0.027 (2)	0.041 (2)	0.0320 (19)	0.0071 (17)	0.0014 (16)	0.0096 (17)
C18	0.0201 (18)	0.049 (2)	0.0258 (18)	0.0030 (17)	0.0049 (15)	0.0022 (16)
C19	0.0221 (18)	0.040 (2)	0.0308 (19)	0.0060 (17)	0.0055 (15)	−0.0011 (16)
C20	0.0193 (18)	0.0292 (18)	0.0274 (18)	0.0049 (14)	0.0001 (14)	0.0019 (14)
N1	0.0068 (12)	0.0208 (12)	0.0237 (14)	0.0003 (11)	−0.0009 (10)	0.0003 (11)
Fe1	0.0085 (2)	0.0199 (2)	0.0202 (3)	−0.00065 (19)	−0.00110 (17)	0.00174 (18)

Geometric parameters (Å, º) top

C1—C2	1.378 (4)	C10—Fe1	2.047 (3)
C1—N1	1.384 (3)	C10—H10	0.9300
C1—H1	0.9300	C11—C12	1.409 (5)
C2—C3	1.425 (4)	C11—Fe1	2.036 (3)
C2—C5	1.449 (4)	C11—H11	0.9300
C3—C4	1.349 (4)	C12—C13	1.417 (4)
C3—H3	0.9300	C12—Fe1	2.032 (3)
C4—N1	1.373 (4)	C12—H12	0.9300
C4—H4	0.9300	C13—C14	1.417 (4)
C5—C9	1.435 (4)	C13—Fe1	2.046 (3)
C5—C6	1.435 (4)	C13—H13	0.9300
C5—Fe1	2.075 (3)	C14—Fe1	2.053 (3)
C6—C7	1.414 (4)	C14—H14	0.9300
C6—Fe1	2.046 (3)	C15—C16	1.384 (4)
C6—H6	0.9300	C15—C20	1.392 (4)
C7—C8	1.417 (4)	C15—N1	1.424 (4)
C7—Fe1	2.040 (3)	C16—C17	1.389 (4)
C7—H7	0.9300	C16—H16	0.9300
C8—C9	1.413 (4)	C17—C18	1.379 (4)
C8—Fe1	2.038 (3)	C17—H17	0.9300
C8—H8	0.9300	C18—C19	1.378 (4)
C9—Fe1	2.047 (3)	C18—H18	0.9300
C9—H9	0.9300	C19—C20	1.376 (4)
C10—C14	1.403 (4)	C19—H19	0.9300
C10—C11	1.417 (4)	C20—H20	0.9300

C2—C1—N1	108.4 (2)	C10—C14—H14	125.9
C2—C1—H1	125.8	C13—C14—H14	125.9
N1—C1—H1	125.8	Fe1—C14—H14	126.4
C1—C2—C3	106.2 (2)	C16—C15—C20	119.2 (3)
C1—C2—C5	127.7 (3)	C16—C15—N1	120.6 (3)
C3—C2—C5	125.9 (3)	C20—C15—N1	120.2 (3)
C4—C3—C2	108.3 (3)	C15—C16—C17	120.1 (3)
C4—C3—H3	125.9	C15—C16—H16	120.0
C2—C3—H3	125.9	C17—C16—H16	120.0
C3—C4—N1	108.9 (3)	C18—C17—C16	120.7 (3)
C3—C4—H4	125.6	C18—C17—H17	119.6
N1—C4—H4	125.6	C16—C17—H17	119.6
C9—C5—C6	106.4 (3)	C19—C18—C17	118.7 (3)
C9—C5—C2	128.5 (3)	C19—C18—H18	120.6
C6—C5—C2	125.0 (3)	C17—C18—H18	120.6
C9—C5—Fe1	68.60 (16)	C20—C19—C18	121.4 (3)
C6—C5—Fe1	68.56 (16)	C20—C19—H19	119.3
C2—C5—Fe1	130.1 (2)	C18—C19—H19	119.3
C7—C6—C5	108.7 (3)	C19—C20—C15	119.8 (3)
C7—C6—Fe1	69.53 (17)	C19—C20—H20	120.1
C5—C6—Fe1	70.70 (16)	C15—C20—H20	120.1
C7—C6—H6	125.7	C4—N1—C1	108.2 (2)
C5—C6—H6	125.7	C4—N1—C15	126.0 (2)
Fe1—C6—H6	125.7	C1—N1—C15	125.7 (2)
C6—C7—C8	108.1 (3)	C12—Fe1—C11	40.53 (13)
C6—C7—Fe1	69.99 (17)	C12—Fe1—C8	127.87 (13)
C8—C7—Fe1	69.56 (17)	C11—Fe1—C8	165.53 (13)
C6—C7—H7	126.0	C12—Fe1—C7	107.52 (13)
C8—C7—H7	126.0	C11—Fe1—C7	127.38 (13)
Fe1—C7—H7	126.1	C8—Fe1—C7	40.67 (12)
C9—C8—C7	108.2 (3)	C12—Fe1—C13	40.66 (13)
C9—C8—Fe1	70.14 (16)	C11—Fe1—C13	68.05 (13)
C7—C8—Fe1	69.77 (17)	C8—Fe1—C13	108.58 (12)
C9—C8—H8	125.9	C7—Fe1—C13	118.60 (13)
C7—C8—H8	125.9	C12—Fe1—C6	117.74 (13)
Fe1—C8—H8	125.8	C11—Fe1—C6	107.65 (12)
C8—C9—C5	108.6 (3)	C8—Fe1—C6	68.25 (12)
C8—C9—Fe1	69.40 (17)	C7—Fe1—C6	40.48 (11)
C5—C9—Fe1	70.67 (16)	C13—Fe1—C6	151.85 (13)
C8—C9—H9	125.7	C12—Fe1—C10	68.21 (13)
C5—C9—H9	125.7	C11—Fe1—C10	40.61 (13)
Fe1—C9—H9	125.8	C8—Fe1—C10	152.65 (13)
C14—C10—C11	108.1 (3)	C7—Fe1—C10	165.59 (12)
C14—C10—Fe1	70.23 (18)	C13—Fe1—C10	67.81 (13)
C11—C10—Fe1	69.28 (18)	C6—Fe1—C10	128.09 (12)
C14—C10—H10	125.9	C12—Fe1—C9	166.10 (13)
C11—C10—H10	125.9	C11—Fe1—C9	152.46 (13)
Fe1—C10—H10	126.1	C8—Fe1—C9	40.47 (11)
C12—C11—C10	108.1 (3)	C7—Fe1—C9	68.23 (12)
C12—C11—Fe1	69.58 (18)	C13—Fe1—C9	128.57 (12)
C10—C11—Fe1	70.12 (17)	C6—Fe1—C9	68.27 (12)
C12—C11—H11	126.0	C10—Fe1—C9	119.17 (13)
C10—C11—H11	126.0	C12—Fe1—C14	68.19 (13)
Fe1—C11—H11	125.9	C11—Fe1—C14	67.88 (13)
C11—C12—C13	107.9 (3)	C8—Fe1—C14	119.39 (12)
C11—C12—Fe1	69.89 (19)	C7—Fe1—C14	152.72 (13)
C13—C12—Fe1	70.22 (18)	C13—Fe1—C14	40.43 (12)
C11—C12—H12	126.1	C6—Fe1—C14	165.97 (12)
C13—C12—H12	126.1	C10—Fe1—C14	40.03 (12)
Fe1—C12—H12	125.4	C9—Fe1—C14	109.11 (12)
C14—C13—C12	107.8 (3)	C12—Fe1—C5	151.56 (12)
C14—C13—Fe1	70.06 (18)	C11—Fe1—C5	118.19 (12)
C12—C13—Fe1	69.12 (18)	C8—Fe1—C5	68.44 (12)
C14—C13—H13	126.1	C7—Fe1—C5	68.45 (12)
C12—C13—H13	126.1	C13—Fe1—C5	166.39 (12)
Fe1—C13—H13	126.3	C6—Fe1—C5	40.74 (11)
C10—C14—C13	108.1 (3)	C10—Fe1—C5	108.33 (12)
C10—C14—Fe1	69.73 (18)	C9—Fe1—C5	40.73 (11)
C13—C14—Fe1	69.51 (18)	C14—Fe1—C5	128.38 (12)

N1—C1—C2—C3	0.9 (3)	Fe1—C10—C11—C12	59.5 (2)
N1—C1—C2—C5	176.7 (3)	C14—C10—C11—Fe1	−59.7 (2)
C1—C2—C3—C4	−0.8 (3)	C10—C11—C12—C13	0.4 (4)
C5—C2—C3—C4	−176.7 (3)	Fe1—C11—C12—C13	60.2 (2)
C2—C3—C4—N1	0.4 (3)	C10—C11—C12—Fe1	−59.8 (2)
C1—C2—C5—C9	−5.1 (5)	C11—C12—C13—C14	−0.4 (4)
C3—C2—C5—C9	169.9 (3)	Fe1—C12—C13—C14	59.6 (2)
C1—C2—C5—C6	178.8 (3)	C11—C12—C13—Fe1	−60.0 (2)
C3—C2—C5—C6	−6.2 (5)	C11—C10—C14—C13	0.0 (3)
C1—C2—C5—Fe1	88.4 (4)	Fe1—C10—C14—C13	−59.1 (2)
C3—C2—C5—Fe1	−96.6 (3)	C11—C10—C14—Fe1	59.1 (2)
C9—C5—C6—C7	−1.0 (3)	C12—C13—C14—C10	0.3 (3)
C2—C5—C6—C7	175.9 (3)	Fe1—C13—C14—C10	59.3 (2)
Fe1—C5—C6—C7	−59.4 (2)	C12—C13—C14—Fe1	−59.0 (2)
C9—C5—C6—Fe1	58.4 (2)	C20—C15—C16—C17	0.6 (5)
C2—C5—C6—Fe1	−124.8 (3)	N1—C15—C16—C17	179.3 (3)
C5—C6—C7—C8	0.7 (3)	C15—C16—C17—C18	−0.6 (5)
Fe1—C6—C7—C8	−59.4 (2)	C16—C17—C18—C19	0.4 (5)
C5—C6—C7—Fe1	60.1 (2)	C17—C18—C19—C20	−0.1 (5)
C6—C7—C8—C9	−0.2 (3)	C18—C19—C20—C15	0.0 (5)
Fe1—C7—C8—C9	−59.8 (2)	C16—C15—C20—C19	−0.3 (5)
C6—C7—C8—Fe1	59.6 (2)	N1—C15—C20—C19	−179.0 (3)
C7—C8—C9—C5	−0.4 (3)	C3—C4—N1—C1	0.2 (3)
Fe1—C8—C9—C5	−60.0 (2)	C3—C4—N1—C15	177.4 (3)
C7—C8—C9—Fe1	59.6 (2)	C2—C1—N1—C4	−0.7 (3)
C6—C5—C9—C8	0.8 (3)	C2—C1—N1—C15	−177.9 (3)
C2—C5—C9—C8	−175.8 (3)	C16—C15—N1—C4	−178.3 (3)
Fe1—C5—C9—C8	59.2 (2)	C20—C15—N1—C4	0.5 (4)
C6—C5—C9—Fe1	−58.38 (19)	C16—C15—N1—C1	−1.6 (4)
C2—C5—C9—Fe1	125.0 (3)	C20—C15—N1—C1	177.2 (3)
C14—C10—C11—C12	−0.3 (4)

Acknowledgements

MK thanks the Fonds der Chemischen Industrie for a PhD Chemiefonds fellowship.

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