Tri­carbonyl­[(6a,7,8,9,10a-[eta])-3,3-di­methyl-3H-benzo­[f]­chromene]chromium

The title compound, [Cr(C₁₅H₁₄O)(CO)₃], is a chromene complexed with tri­carbonyl­chromium and it exhibits photochromic properties. The molecular geometry is compared to that of two similar complexes. The analysis results indicate that complexation has minor effects on the chromene structure.

Computing details

Data collection: CAD-4 Operations Manual (Enraf-Nonius, 1977); cell refinement: CAD-4 Operations Manual; data reduction: DATARED (Pèpe, 1979); program(s) used to solve structure: SHELXS86 (Sheldrick, 1985); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: PLATON (Spek, 1990).

(I)

Crystal data

[Cr(C15H14O)(CO)3]	F(000) = 712
Mr = 346.29	Dx = 1.456 Mg m^−3 Dm = 1.45 (2) Mg m^−3 Dm measured by Flotation in (Benzene/Chloroform)
Monoclinic, P21/n	Mo Kα radiation, λ = 0.71073 Å
a = 12.190 (2) Å	Cell parameters from 25 reflections
b = 9.147 (2) Å	θ = 9–15°
c = 14.612 (3) Å	µ = 0.74 mm^−1
β = 104.20 (2)°	T = 293 K
V = 1579.5 (5) Å^3	Square platelet, red
Z = 4	0.32 × 0.30 × 0.21 mm

Data collection

Nonius CAD-4 diffractometer	4072 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	θmax = 30.2°, θmin = 2.0°
Graphite monochromator	h = −16→16
ω/2θ scans	k = 0→12
Absorption correction: ψ scans (North et al., 1968)	l = 0→20
Tmin = 0.785, Tmax = 0.856	3 standard reflections every 60 min
4663 measured reflections	intensity decay: none
4663 independent reflections

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.036	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.073	Only H-atom coordinates refined
S = 0.98	Calculated w = 1/[σ^2(Fo^2) + (0.040P)^2] where P = (Fo^2 + 2Fc^2)/3
4663 reflections	(Δ/σ)max = 0.002
250 parameters	Δρmax = 0.42 e Å^−3
14 restraints	Δρmin = −0.26 e Å^−3

Special details

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 on F² for ALL reflections except for 0 with very negative F² or flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The observed criterion of F² > σ(F²) is used only for calculating _R_factor_obs 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 (Ų)

	x	y	z	Uiso*/Ueq
Cr	0.725047 (15)	0.27169 (2)	0.421771 (13)	0.03160 (6)
C2	0.63706 (13)	0.2134 (2)	0.50202 (10)	0.0525 (3)
O3	0.58353 (15)	0.1779 (3)	0.55139 (12)	0.0980 (6)
C4	0.61716 (10)	0.20193 (14)	0.32023 (9)	0.0377 (2)
O5	0.55113 (10)	0.16002 (15)	0.25553 (8)	0.0598 (3)
C6	0.65063 (14)	0.44741 (17)	0.40515 (12)	0.0523 (3)
O7	0.60292 (15)	0.55714 (17)	0.39262 (13)	0.0905 (5)
C8	0.85745 (11)	0.22875 (15)	0.34544 (9)	0.0397 (2)
C9	0.87721 (12)	0.36545 (16)	0.38713 (11)	0.0453 (3)
C10	0.88708 (11)	0.38202 (14)	0.48535 (11)	0.0434 (3)
C11	0.87876 (10)	0.26017 (13)	0.54063 (9)	0.0363 (2)
C12	0.86641 (9)	0.11498 (12)	0.50096 (8)	0.03060 (19)
C13	0.85386 (9)	0.10027 (12)	0.40071 (8)	0.0316 (2)
C14	0.83557 (11)	−0.04192 (14)	0.35979 (8)	0.0376 (2)
C15	0.82969 (12)	−0.16109 (14)	0.41282 (9)	0.0392 (2)
C16	0.84096 (10)	−0.14649 (12)	0.51141 (8)	0.0338 (2)
C17	0.86168 (9)	−0.01307 (12)	0.55651 (7)	0.0310 (2)
C18	0.88723 (11)	−0.01345 (14)	0.65950 (8)	0.0372 (2)
C19	0.86368 (12)	−0.13166 (16)	0.70411 (9)	0.0426 (3)
C20	0.80350 (12)	−0.25997 (15)	0.64990 (10)	0.0432 (3)
O21	0.83591 (9)	−0.27235 (10)	0.55959 (7)	0.0422 (2)
C22	0.67646 (16)	−0.2406 (2)	0.62840 (17)	0.0607 (4)
C23	0.8397 (2)	−0.4047 (2)	0.69920 (15)	0.0618 (4)
H8	0.8465 (17)	0.216 (2)	0.2800 (14)	0.053*
H9	0.8797 (15)	0.449 (2)	0.3494 (13)	0.048*
H10	0.8964 (14)	0.4869 (18)	0.5119 (12)	0.041*
H11	0.8836 (15)	0.2632 (19)	0.6048 (12)	0.041*
H14	0.8304 (15)	−0.045 (2)	0.2925 (13)	0.048*
H15	0.8263 (15)	−0.2520 (18)	0.3851 (12)	0.040*
H18	0.9284 (15)	0.069 (2)	0.6932 (13)	0.047*
H19	0.8833 (17)	−0.145 (2)	0.7675 (14)	0.058*
H221	0.656 (2)	−0.228 (3)	0.6854 (17)	0.073*
H222	0.662 (2)	−0.161 (3)	0.5967 (17)	0.073*
H223	0.641 (2)	−0.311 (3)	0.5929 (17)	0.073*
H231	0.9167 (17)	−0.414 (2)	0.7127 (14)	0.056*
H232	0.8216 (17)	−0.393 (2)	0.7576 (14)	0.056*
H233	0.7999 (17)	−0.481 (2)	0.6597 (14)	0.056*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Cr	0.03068 (9)	0.03117 (9)	0.03098 (9)	0.00232 (6)	0.00379 (6)	0.00045 (6)
C2	0.0402 (6)	0.0755 (10)	0.0404 (6)	0.0123 (7)	0.0069 (5)	0.0094 (7)
O3	0.0706 (9)	0.1621 (18)	0.0729 (9)	0.0160 (11)	0.0399 (8)	0.0373 (11)
C4	0.0353 (5)	0.0372 (5)	0.0394 (5)	0.0003 (4)	0.0068 (4)	0.0011 (4)
O5	0.0518 (6)	0.0696 (7)	0.0493 (6)	−0.0103 (5)	−0.0045 (5)	−0.0094 (5)
C6	0.0520 (7)	0.0435 (7)	0.0540 (8)	0.0107 (6)	−0.0011 (6)	−0.0046 (6)
O7	0.0947 (11)	0.0586 (8)	0.1009 (12)	0.0404 (8)	−0.0091 (9)	−0.0062 (8)
C8	0.0372 (5)	0.0437 (6)	0.0393 (6)	0.0009 (5)	0.0117 (4)	0.0060 (5)
C9	0.0425 (6)	0.0400 (6)	0.0531 (7)	−0.0045 (5)	0.0109 (5)	0.0089 (5)
C10	0.0394 (6)	0.0336 (5)	0.0535 (7)	−0.0064 (5)	0.0040 (5)	−0.0022 (5)
C11	0.0345 (5)	0.0345 (5)	0.0348 (5)	−0.0014 (4)	−0.0015 (4)	−0.0053 (4)
C12	0.0275 (4)	0.0311 (5)	0.0307 (4)	0.0006 (4)	0.0024 (3)	−0.0041 (4)
C13	0.0307 (5)	0.0325 (5)	0.0309 (5)	0.0020 (4)	0.0060 (4)	−0.0013 (4)
C14	0.0426 (6)	0.0391 (6)	0.0303 (5)	0.0033 (5)	0.0077 (4)	−0.0059 (4)
C15	0.0470 (6)	0.0331 (5)	0.0362 (5)	0.0011 (5)	0.0075 (5)	−0.0092 (4)
C16	0.0354 (5)	0.0295 (5)	0.0360 (5)	0.0037 (4)	0.0077 (4)	−0.0014 (4)
C17	0.0303 (4)	0.0323 (5)	0.0285 (4)	0.0037 (4)	0.0036 (4)	−0.0021 (4)
C18	0.0397 (5)	0.0391 (6)	0.0304 (5)	0.0034 (4)	0.0036 (4)	−0.0037 (4)
C19	0.0470 (6)	0.0473 (7)	0.0338 (5)	0.0054 (5)	0.0108 (5)	0.0025 (5)
C20	0.0482 (7)	0.0399 (6)	0.0455 (6)	0.0040 (5)	0.0192 (5)	0.0046 (5)
O21	0.0555 (5)	0.0306 (4)	0.0432 (4)	0.0048 (4)	0.0174 (4)	0.0005 (3)
C22	0.0490 (8)	0.0613 (10)	0.0749 (12)	−0.0023 (7)	0.0212 (8)	−0.0048 (9)
C23	0.0846 (13)	0.0469 (8)	0.0621 (10)	0.0109 (8)	0.0337 (9)	0.0153 (7)

Geometric parameters (Å, º)

Cr—C6	1.8323 (15)	C12—C13	1.4412 (15)
Cr—C4	1.8387 (13)	C13—C14	1.4259 (16)
Cr—C2	1.8510 (16)	C14—C15	1.3494 (19)
Cr—C10	2.2097 (13)	C14—H14	0.970 (18)
Cr—C8	2.2105 (13)	C15—C16	1.4195 (17)
Cr—C9	2.2120 (14)	C15—H15	0.921 (16)
Cr—C11	2.2230 (13)	C16—O21	1.3587 (15)
Cr—C13	2.2926 (11)	C16—C17	1.3804 (15)
Cr—C12	2.3205 (11)	C17—C18	1.4601 (16)
C2—O3	1.133 (2)	C18—C19	1.3298 (19)
C4—O5	1.1468 (17)	C18—H18	0.973 (18)
C6—O7	1.152 (2)	C19—C20	1.503 (2)
C8—C9	1.386 (2)	C19—H19	0.905 (19)
C8—C13	1.4327 (17)	C20—O21	1.4718 (16)
C8—H8	0.940 (19)	C20—C22	1.513 (2)
C9—C10	1.419 (2)	C20—C23	1.520 (2)
C9—H9	0.946 (18)	C22—H221	0.93 (2)
C10—C11	1.3947 (19)	C22—H222	0.85 (2)
C10—H10	1.030 (17)	C22—H223	0.87 (2)
C11—C12	1.4420 (15)	C23—H231	0.91 (2)
C11—H11	0.926 (17)	C23—H232	0.939 (19)
C12—C17	1.4343 (16)	C23—H233	0.96 (2)
C6—Cr—C4	87.97 (6)	Cr—C10—H10	126.0 (10)
C6—Cr—C2	89.52 (8)	C10—C11—C12	121.23 (11)
C4—Cr—C2	90.02 (7)	C10—C11—Cr	71.14 (7)
C6—Cr—C10	91.00 (6)	C12—C11—Cr	75.21 (6)
C4—Cr—C10	152.42 (6)	C10—C11—H11	124.6 (11)
C2—Cr—C10	117.53 (7)	C12—C11—H11	114.2 (11)
C6—Cr—C8	119.21 (7)	Cr—C11—H11	128.5 (11)
C4—Cr—C8	89.85 (6)	C17—C12—C13	119.33 (10)
C2—Cr—C8	151.25 (7)	C17—C12—C11	122.64 (10)
C10—Cr—C8	66.75 (6)	C13—C12—C11	117.98 (10)
C6—Cr—C9	92.59 (7)	C17—C12—Cr	131.19 (8)
C4—Cr—C9	115.08 (6)	C13—C12—Cr	70.74 (6)
C2—Cr—C9	154.86 (7)	C11—C12—Cr	67.86 (6)
C10—Cr—C9	37.43 (6)	C14—C13—C8	122.35 (11)
C8—Cr—C9	36.52 (5)	C14—C13—C12	118.56 (10)
C6—Cr—C11	116.11 (6)	C8—C13—C12	119.08 (11)
C4—Cr—C11	155.92 (5)	C14—C13—Cr	129.66 (8)
C2—Cr—C11	89.99 (6)	C8—C13—Cr	68.36 (7)
C10—Cr—C11	36.68 (5)	C12—C13—Cr	72.85 (6)
C8—Cr—C11	78.81 (5)	C15—C14—C13	121.39 (11)
C9—Cr—C11	66.65 (5)	C15—C14—H14	124.1 (11)
C6—Cr—C13	156.25 (7)	C13—C14—H14	114.5 (11)
C4—Cr—C13	91.85 (5)	C14—C15—C16	120.08 (11)
C2—Cr—C13	114.24 (6)	C14—C15—H15	118.7 (11)
C10—Cr—C13	78.33 (5)	C16—C15—H15	120.9 (11)
C8—Cr—C13	37.05 (4)	O21—C16—C17	121.87 (11)
C9—Cr—C13	66.05 (5)	O21—C16—C15	116.15 (10)
C11—Cr—C13	66.34 (4)	C17—C16—C15	121.90 (11)
C6—Cr—C12	152.99 (6)	C16—C17—C12	118.68 (10)
C4—Cr—C12	118.99 (5)	C16—C17—C18	117.24 (10)
C2—Cr—C12	88.92 (6)	C12—C17—C18	123.86 (10)
C10—Cr—C12	66.08 (5)	C19—C18—C17	119.35 (12)
C8—Cr—C12	66.23 (5)	C19—C18—H18	122.1 (11)
C9—Cr—C12	77.98 (5)	C17—C18—H18	118.2 (11)
C11—Cr—C12	36.93 (4)	C18—C19—C20	120.85 (12)
C13—Cr—C12	36.40 (4)	C18—C19—H19	125.0 (14)
O3—C2—Cr	179.8 (2)	C20—C19—H19	114.2 (14)
O5—C4—Cr	178.42 (13)	O21—C20—C19	109.21 (11)
O7—C6—Cr	178.48 (16)	O21—C20—C22	107.99 (13)
C9—C8—C13	121.23 (12)	C19—C20—C22	111.12 (13)
C9—C8—Cr	71.80 (8)	O21—C20—C23	104.31 (12)
C13—C8—Cr	74.59 (7)	C19—C20—C23	112.52 (14)
C9—C8—H8	121.8 (12)	C22—C20—C23	111.35 (15)
C13—C8—H8	116.9 (12)	C16—O21—C20	117.10 (9)
Cr—C8—H8	126.6 (12)	C20—C22—H221	108.1 (16)
C8—C9—C10	120.23 (12)	C20—C22—H222	105.8 (17)
C8—C9—Cr	71.68 (8)	H221—C22—H222	109 (2)
C10—C9—Cr	71.20 (8)	C20—C22—H223	111.8 (17)
C8—C9—H9	119.8 (11)	H221—C22—H223	115 (2)
C10—C9—H9	119.8 (11)	H222—C22—H223	107 (2)
Cr—C9—H9	126.5 (11)	C20—C23—H231	110.3 (14)
C11—C10—C9	120.02 (12)	C20—C23—H232	102.9 (13)
C11—C10—Cr	72.18 (7)	H231—C23—H232	105.8 (18)
C9—C10—Cr	71.38 (8)	C20—C23—H233	107.6 (13)
C11—C10—H10	122.9 (10)	H231—C23—H233	114.0 (18)
C9—C10—H10	117.1 (10)	H232—C23—H233	115.8 (18)
C6—Cr—C2—O3	−98 (50)	C10—C11—C12—C17	177.72 (11)
C4—Cr—C2—O3	174 (100)	Cr—C11—C12—C17	−125.71 (10)
C10—Cr—C2—O3	−7 (50)	C10—C11—C12—C13	−4.83 (17)
C8—Cr—C2—O3	84 (50)	Cr—C11—C12—C13	51.73 (9)
C9—Cr—C2—O3	−3 (50)	C10—C11—C12—Cr	−56.57 (11)
C11—Cr—C2—O3	18 (50)	C6—Cr—C12—C17	110.08 (16)
C13—Cr—C2—O3	82 (50)	C4—Cr—C12—C17	−66.16 (11)
C12—Cr—C2—O3	55 (50)	C2—Cr—C12—C17	23.27 (11)
C6—Cr—C4—O5	79 (5)	C10—Cr—C12—C17	144.21 (11)
C2—Cr—C4—O5	169 (5)	C8—Cr—C12—C17	−141.85 (11)
C10—Cr—C4—O5	−9 (5)	C9—Cr—C12—C17	−178.33 (11)
C8—Cr—C4—O5	−40 (5)	C11—Cr—C12—C17	114.69 (13)
C9—Cr—C4—O5	−13 (5)	C13—Cr—C12—C17	−112.57 (12)
C11—Cr—C4—O5	−101 (5)	C6—Cr—C12—C13	−137.34 (15)
C13—Cr—C4—O5	−77 (5)	C4—Cr—C12—C13	46.41 (8)
C12—Cr—C4—O5	−102 (5)	C2—Cr—C12—C13	135.84 (8)
C4—Cr—C6—O7	−26 (7)	C10—Cr—C12—C13	−103.22 (8)
C2—Cr—C6—O7	−116 (7)	C8—Cr—C12—C13	−29.27 (7)
C10—Cr—C6—O7	127 (7)	C9—Cr—C12—C13	−65.76 (7)
C8—Cr—C6—O7	63 (7)	C11—Cr—C12—C13	−132.74 (10)
C9—Cr—C6—O7	89 (7)	C6—Cr—C12—C11	−4.60 (17)
C11—Cr—C6—O7	154 (7)	C4—Cr—C12—C11	179.15 (8)
C13—Cr—C6—O7	64 (7)	C2—Cr—C12—C11	−91.42 (9)
C12—Cr—C6—O7	158 (7)	C10—Cr—C12—C11	29.52 (8)
C6—Cr—C8—C9	48.10 (10)	C8—Cr—C12—C11	103.47 (8)
C4—Cr—C8—C9	135.69 (9)	C9—Cr—C12—C11	66.98 (8)
C2—Cr—C8—C9	−134.53 (13)	C13—Cr—C12—C11	132.74 (10)
C10—Cr—C8—C9	−29.29 (8)	C9—C8—C13—C14	−178.93 (12)
C11—Cr—C8—C9	−65.70 (8)	Cr—C8—C13—C14	124.16 (11)
C13—Cr—C8—C9	−131.05 (11)	C9—C8—C13—C12	2.60 (18)
C12—Cr—C8—C9	−102.26 (9)	Cr—C8—C13—C12	−54.30 (9)
C6—Cr—C8—C13	179.14 (8)	C9—C8—C13—Cr	56.91 (11)
C4—Cr—C8—C13	−93.26 (8)	C17—C12—C13—C14	0.81 (16)
C2—Cr—C8—C13	−3.48 (16)	C11—C12—C13—C14	−176.72 (10)
C10—Cr—C8—C13	101.76 (8)	Cr—C12—C13—C14	−126.34 (10)
C9—Cr—C8—C13	131.05 (11)	C17—C12—C13—C8	179.34 (10)
C11—Cr—C8—C13	65.35 (7)	C11—C12—C13—C8	1.80 (16)
C12—Cr—C8—C13	28.79 (6)	Cr—C12—C13—C8	52.19 (9)
C13—C8—C9—C10	−4.1 (2)	C17—C12—C13—Cr	127.15 (10)
Cr—C8—C9—C10	54.13 (12)	C11—C12—C13—Cr	−50.38 (9)
C13—C8—C9—Cr	−58.23 (11)	C6—Cr—C13—C14	−116.61 (16)
C6—Cr—C9—C8	−139.44 (9)	C4—Cr—C13—C14	−27.45 (11)
C4—Cr—C9—C8	−50.47 (9)	C2—Cr—C13—C14	63.40 (12)
C2—Cr—C9—C8	126.18 (16)	C10—Cr—C13—C14	178.53 (11)
C10—Cr—C9—C8	132.30 (12)	C8—Cr—C13—C14	−114.76 (13)
C11—Cr—C9—C8	103.15 (9)	C9—Cr—C13—C14	−144.17 (12)
C13—Cr—C9—C8	29.81 (7)	C11—Cr—C13—C14	142.01 (12)
C12—Cr—C9—C8	66.12 (8)	C12—Cr—C13—C14	113.21 (13)
C6—Cr—C9—C10	88.26 (9)	C6—Cr—C13—C8	−1.85 (17)
C4—Cr—C9—C10	177.23 (8)	C4—Cr—C13—C8	87.31 (8)
C2—Cr—C9—C10	−6.12 (19)	C2—Cr—C13—C8	178.16 (9)
C8—Cr—C9—C10	−132.30 (12)	C10—Cr—C13—C8	−66.71 (8)
C11—Cr—C9—C10	−29.15 (8)	C9—Cr—C13—C8	−29.41 (8)
C13—Cr—C9—C10	−102.49 (9)	C11—Cr—C13—C8	−103.23 (8)
C12—Cr—C9—C10	−66.18 (8)	C12—Cr—C13—C8	−132.03 (10)
C8—C9—C10—C11	1.1 (2)	C6—Cr—C13—C12	130.18 (14)
Cr—C9—C10—C11	55.41 (11)	C4—Cr—C13—C12	−140.66 (7)
C8—C9—C10—Cr	−54.36 (12)	C2—Cr—C13—C12	−49.80 (9)
C6—Cr—C10—C11	135.52 (9)	C10—Cr—C13—C12	65.32 (7)
C4—Cr—C10—C11	−136.94 (11)	C8—Cr—C13—C12	132.03 (10)
C2—Cr—C10—C11	45.55 (11)	C9—Cr—C13—C12	102.62 (8)
C8—Cr—C10—C11	−102.90 (9)	C11—Cr—C13—C12	28.80 (6)
C9—Cr—C10—C11	−131.52 (12)	C8—C13—C14—C15	−178.33 (12)
C13—Cr—C10—C11	−65.87 (8)	C12—C13—C14—C15	0.14 (18)
C12—Cr—C10—C11	−29.71 (7)	Cr—C13—C14—C15	−90.73 (14)
C6—Cr—C10—C9	−92.95 (10)	C13—C14—C15—C16	0.5 (2)
C4—Cr—C10—C9	−5.42 (16)	C14—C15—C16—O21	−178.91 (12)
C2—Cr—C10—C9	177.07 (9)	C14—C15—C16—C17	−2.13 (19)
C8—Cr—C10—C9	28.63 (8)	O21—C16—C17—C12	179.65 (10)
C11—Cr—C10—C9	131.52 (12)	C15—C16—C17—C12	3.05 (17)
C13—Cr—C10—C9	65.66 (8)	O21—C16—C17—C18	4.84 (17)
C12—Cr—C10—C9	101.81 (9)	C15—C16—C17—C18	−171.75 (11)
C9—C10—C11—C12	3.47 (19)	C13—C12—C17—C16	−2.37 (16)
Cr—C10—C11—C12	58.50 (10)	C11—C12—C17—C16	175.04 (11)
C9—C10—C11—Cr	−55.03 (12)	Cr—C12—C17—C16	87.00 (13)
C6—Cr—C11—C10	−51.27 (11)	C13—C12—C17—C18	172.07 (10)
C4—Cr—C11—C10	129.24 (13)	C11—C12—C17—C18	−10.52 (17)
C2—Cr—C11—C10	−140.73 (10)	Cr—C12—C17—C18	−98.56 (12)
C8—Cr—C11—C10	65.92 (9)	C16—C17—C18—C19	−15.90 (17)
C9—Cr—C11—C10	29.71 (8)	C12—C17—C18—C19	169.58 (12)
C13—Cr—C11—C10	102.64 (9)	C17—C18—C19—C20	−4.56 (19)
C12—Cr—C11—C10	131.05 (12)	C18—C19—C20—O21	32.53 (17)
C6—Cr—C11—C12	177.67 (9)	C18—C19—C20—C22	−86.50 (17)
C4—Cr—C11—C12	−1.81 (16)	C18—C19—C20—C23	147.86 (14)
C2—Cr—C11—C12	88.22 (9)	C17—C16—O21—C20	26.14 (17)
C10—Cr—C11—C12	−131.05 (12)	C15—C16—O21—C20	−157.08 (12)
C8—Cr—C11—C12	−65.13 (7)	C19—C20—O21—C16	−42.78 (15)
C9—Cr—C11—C12	−101.35 (8)	C22—C20—O21—C16	78.18 (15)
C13—Cr—C11—C12	−28.42 (6)	C23—C20—O21—C16	−163.28 (14)