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The title compound, [Yb(Dpp)2(thf)2] [Dpp = 2,6-Ph2C6H3 (m-ter­phenyl), C18H13, and thf = tetra­hydro­furan, C4H8O], is the first example of a structurally characterized YbII di­aryl. The Yb atom shows a strongly distorted tetrahedral environment formed by the C atoms of two aryl groups (average Yb—C = 2.520 Å) and the O atoms of two tetra­hydro­furan ligands (average Yb—O = 2.412 Å). In addition, there are two weak η1–π-arene interactions (average Yb...C = 3.138 Å) involving ortho-C atoms of the m-ter­phenyl phenyl groups.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536801018797/ya6073sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536801018797/ya6073Isup2.hkl
Contains datablock I

CCDC reference: 177182

Key indicators

  • Single-crystal X-ray study
  • T = 173 K
  • Mean [sigma](C-C) = 0.006 Å
  • R factor = 0.032
  • wR factor = 0.078
  • Data-to-parameter ratio = 17.2

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry








Computing details top

Data collection: P3 (Siemens, 1989); cell refinement: P3; data reduction: XDISK (Siemens, 1989); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Sheldrick, 1998); software used to prepare material for publication: SHELXTL.

bis(1,1':3',1''-terphenyl-κC2')bis(tetrahydrofuran-κO)ytterbium(II) top
Crystal data top
[Yb(C18H13)2(C4H8O)2]F(000) = 784
Mr = 775.82Dx = 1.487 Mg m3
Triclinic, P1Melting point: >378K (dec) K
a = 9.754 (3) ÅMo Kα radiation, λ = 0.71073 Å
b = 11.9028 (18) ÅCell parameters from 18 reflections
c = 17.093 (3) Åθ = 8.1–12.2°
α = 75.923 (14)°µ = 2.74 mm1
β = 74.367 (18)°T = 173 K
γ = 66.560 (16)°Prism, dark red
V = 1732.5 (6) Å30.30 × 0.20 × 0.15 mm
Z = 2
Data collection top
Rebuilt Syntex P21/Siemens P3 four-circle
diffractometer
7095 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.032
Graphite monochromatorθmax = 27.5°, θmin = 1.9°
Wyckoff scansh = 1212
Absorption correction: ψ scan
(North et al., 1968)
k = 1415
Tmin = 0.494, Tmax = 0.684l = 2122
8446 measured reflections2 standard reflections every 198 reflections
7975 independent reflections intensity decay: none
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.032Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.078Only H-atom displacement parameters refined
S = 1.19 w = 1/[σ2(Fo2) + (0.0409P)2]
where P = (Fo2 + 2Fc2)/3
7975 reflections(Δ/σ)max = 0.001
463 parametersΔρmax = 0.86 e Å3
0 restraintsΔρmin = 0.73 e Å3
Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Yb0.128453 (16)0.213217 (13)0.259122 (9)0.02659 (5)
C10.2732 (4)0.0095 (3)0.3107 (2)0.0256 (6)
C20.3852 (4)0.0141 (3)0.3509 (2)0.0287 (7)
C30.5280 (4)0.1113 (4)0.3482 (2)0.0364 (8)
H3A0.60100.11050.37510.063 (16)*
C40.5617 (4)0.2077 (4)0.3061 (3)0.0412 (9)
H4A0.65840.27250.30360.042 (12)*
C50.4549 (4)0.2097 (3)0.2679 (2)0.0370 (8)
H5A0.47780.27630.23950.056 (14)*
C60.3124 (4)0.1130 (3)0.2710 (2)0.0283 (7)
C70.3522 (4)0.0882 (3)0.3966 (2)0.0287 (7)
C80.2030 (4)0.1491 (3)0.4351 (2)0.0302 (7)
H8A0.12380.12480.43100.018 (8)*
C90.1671 (4)0.2444 (4)0.4792 (2)0.0372 (8)
H9A0.06470.28400.50490.036 (11)*
C100.2815 (5)0.2816 (4)0.4857 (2)0.0408 (9)
H10A0.25770.34720.51520.058 (15)*
C110.4301 (5)0.2220 (4)0.4487 (2)0.0403 (9)
H11A0.50880.24600.45380.036 (11)*
C120.4657 (4)0.1274 (4)0.4043 (2)0.0363 (8)
H12A0.56830.08860.37860.056 (14)*
C130.1976 (4)0.1209 (3)0.2320 (2)0.0316 (7)
C140.2376 (6)0.1708 (4)0.1595 (3)0.0438 (10)
H14A0.34210.20310.13460.039 (12)*
C150.1293 (7)0.1744 (5)0.1233 (3)0.0570 (13)
H15A0.15980.20930.07420.072 (17)*
C160.0233 (7)0.1274 (5)0.1584 (3)0.0625 (14)
H16A0.09830.12860.13320.063 (15)*
C170.0666 (6)0.0779 (5)0.2314 (3)0.0569 (12)
H17A0.17120.04550.25620.054 (14)*
C180.0437 (5)0.0764 (3)0.2675 (3)0.0383 (8)
H18A0.01360.04420.31760.039 (11)*
C190.1080 (4)0.3049 (3)0.1981 (2)0.0260 (6)
C200.2430 (4)0.3638 (3)0.2519 (2)0.0261 (6)
C210.3738 (4)0.4492 (3)0.2240 (2)0.0315 (7)
H21A0.46180.48710.26230.025 (9)*
C220.3758 (4)0.4788 (3)0.1409 (2)0.0355 (8)
H22A0.46480.53710.12200.054 (14)*
C230.2469 (4)0.4230 (3)0.0853 (2)0.0332 (7)
H23A0.24780.44290.02810.066 (16)*
C240.1153 (4)0.3372 (3)0.1132 (2)0.0275 (7)
C250.2444 (4)0.3324 (3)0.3425 (2)0.0260 (6)
C260.1791 (4)0.2095 (3)0.3781 (2)0.0308 (7)
H26A0.13230.14650.34420.064 (16)*
C270.1816 (4)0.1775 (4)0.4622 (2)0.0376 (8)
H27A0.13870.09310.48540.043 (12)*
C280.2460 (4)0.2681 (4)0.5121 (2)0.0403 (9)
H28A0.24670.24640.56940.058 (14)*
C290.3092 (4)0.3898 (4)0.4784 (2)0.0392 (9)
H29A0.35200.45220.51260.049 (13)*
C300.3113 (4)0.4229 (3)0.3944 (2)0.0331 (7)
H30A0.35840.50720.37230.024 (9)*
C310.0220 (4)0.2804 (3)0.0518 (2)0.0286 (7)
C320.0613 (4)0.3466 (3)0.0263 (2)0.0310 (7)
H32A0.00520.42810.04230.026 (10)*
C330.1955 (5)0.2940 (4)0.0798 (2)0.0356 (8)
H33A0.22120.34070.13140.050 (13)*
C340.2921 (5)0.1746 (4)0.0589 (2)0.0389 (9)
H34A0.38410.13900.09570.047 (13)*
C350.2533 (5)0.1068 (4)0.0167 (2)0.0391 (8)
H35A0.31870.02430.03120.059 (15)*
C360.1198 (4)0.1589 (3)0.0710 (2)0.0335 (8)
H36A0.09450.11100.12210.047 (13)*
O410.3565 (3)0.2210 (2)0.16402 (16)0.0387 (6)
C420.3605 (5)0.3178 (4)0.0936 (2)0.0419 (9)
H42A0.34030.39680.11170.073 (17)*
H42B0.28300.33100.06170.057 (14)*
C430.5180 (6)0.2732 (5)0.0425 (3)0.0542 (12)
H43A0.55550.34260.01850.11 (3)*
H43B0.51930.23370.00260.046 (13)*
C440.6144 (5)0.1793 (5)0.1026 (3)0.0508 (11)
H44A0.70030.11430.07450.076*
H44B0.65500.22010.13020.12 (3)*
C450.5056 (6)0.1273 (5)0.1615 (4)0.083 (2)
H45A0.50850.05300.14390.124*
H45B0.53200.10300.21680.13 (3)*
O510.1239 (3)0.4153 (2)0.26762 (17)0.0343 (6)
C520.0020 (5)0.5312 (4)0.2650 (3)0.0447 (10)
H52A0.09940.51790.27390.075 (18)*
H52B0.01160.58530.21170.048 (13)*
C530.0017 (7)0.5861 (5)0.3337 (4)0.0671 (15)
H53A0.04730.55060.38720.101*
H53B0.05030.67730.32530.067 (16)*
C540.1702 (6)0.5513 (4)0.3300 (3)0.0545 (12)
H54A0.19330.52840.38600.09 (2)*
H54B0.20470.62080.30020.073 (17)*
C550.2461 (5)0.4413 (4)0.2841 (3)0.0430 (9)
H55A0.31280.46120.23200.080 (19)*
H55B0.30850.36870.31790.070 (17)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Yb0.02586 (8)0.01942 (7)0.03254 (8)0.00499 (5)0.01025 (5)0.00076 (5)
C10.0254 (15)0.0193 (14)0.0272 (16)0.0061 (12)0.0047 (12)0.0014 (12)
C20.0221 (15)0.0297 (17)0.0268 (16)0.0060 (13)0.0031 (13)0.0015 (13)
C30.0262 (17)0.0346 (19)0.0363 (19)0.0039 (15)0.0051 (15)0.0027 (15)
C40.0273 (18)0.0300 (19)0.045 (2)0.0043 (15)0.0033 (16)0.0028 (16)
C50.038 (2)0.0231 (16)0.0355 (19)0.0010 (15)0.0008 (16)0.0048 (14)
C60.0306 (17)0.0215 (15)0.0233 (15)0.0053 (13)0.0003 (13)0.0009 (12)
C70.0266 (16)0.0312 (17)0.0254 (16)0.0095 (14)0.0076 (13)0.0024 (13)
C80.0254 (16)0.0389 (19)0.0276 (16)0.0132 (14)0.0053 (13)0.0040 (14)
C90.0339 (19)0.045 (2)0.0333 (19)0.0151 (17)0.0019 (15)0.0112 (16)
C100.041 (2)0.057 (2)0.0322 (19)0.0237 (19)0.0048 (16)0.0123 (18)
C110.038 (2)0.058 (3)0.0327 (19)0.0240 (19)0.0122 (16)0.0042 (17)
C120.0247 (17)0.050 (2)0.0329 (18)0.0136 (16)0.0076 (14)0.0018 (16)
C130.045 (2)0.0180 (15)0.0308 (17)0.0122 (14)0.0069 (15)0.0002 (13)
C140.060 (3)0.034 (2)0.036 (2)0.0180 (19)0.0022 (19)0.0083 (16)
C150.087 (4)0.051 (3)0.047 (3)0.037 (3)0.013 (3)0.011 (2)
C160.081 (4)0.059 (3)0.075 (3)0.040 (3)0.033 (3)0.011 (3)
C170.049 (3)0.053 (3)0.081 (4)0.024 (2)0.015 (2)0.019 (3)
C180.042 (2)0.0294 (18)0.047 (2)0.0171 (16)0.0033 (17)0.0106 (16)
C190.0261 (15)0.0231 (15)0.0293 (17)0.0094 (13)0.0061 (13)0.0028 (12)
C200.0261 (15)0.0230 (15)0.0302 (16)0.0111 (13)0.0067 (13)0.0003 (12)
C210.0252 (16)0.0264 (16)0.0393 (19)0.0082 (13)0.0062 (14)0.0006 (14)
C220.0290 (17)0.0325 (18)0.045 (2)0.0094 (15)0.0155 (16)0.0007 (15)
C230.0384 (19)0.0326 (18)0.0356 (19)0.0183 (15)0.0155 (15)0.0010 (14)
C240.0315 (17)0.0245 (16)0.0310 (17)0.0150 (14)0.0074 (14)0.0019 (13)
C250.0221 (15)0.0266 (16)0.0284 (16)0.0112 (13)0.0023 (12)0.0011 (13)
C260.0229 (16)0.0281 (17)0.0368 (18)0.0090 (13)0.0011 (14)0.0018 (14)
C270.0246 (17)0.038 (2)0.039 (2)0.0099 (15)0.0025 (15)0.0076 (16)
C280.0327 (19)0.062 (3)0.0275 (18)0.0231 (18)0.0060 (15)0.0015 (17)
C290.0342 (19)0.052 (2)0.0343 (19)0.0190 (18)0.0006 (16)0.0136 (17)
C300.0312 (17)0.0333 (18)0.0335 (18)0.0131 (15)0.0015 (14)0.0055 (15)
C310.0364 (18)0.0298 (17)0.0259 (16)0.0155 (14)0.0087 (14)0.0059 (13)
C320.043 (2)0.0315 (17)0.0266 (16)0.0205 (16)0.0099 (14)0.0028 (13)
C330.051 (2)0.043 (2)0.0242 (16)0.0289 (18)0.0046 (15)0.0060 (15)
C340.046 (2)0.042 (2)0.0350 (19)0.0215 (18)0.0023 (17)0.0179 (16)
C350.045 (2)0.0306 (18)0.041 (2)0.0140 (16)0.0011 (17)0.0122 (16)
C360.044 (2)0.0291 (17)0.0302 (17)0.0175 (16)0.0043 (15)0.0047 (14)
O410.0408 (15)0.0339 (14)0.0305 (13)0.0096 (12)0.0012 (11)0.0017 (11)
C420.059 (3)0.036 (2)0.0296 (19)0.0196 (19)0.0104 (18)0.0030 (15)
C430.058 (3)0.079 (3)0.034 (2)0.041 (3)0.006 (2)0.003 (2)
C440.048 (2)0.051 (3)0.044 (2)0.018 (2)0.0001 (19)0.001 (2)
C450.050 (3)0.053 (3)0.084 (4)0.005 (2)0.021 (3)0.019 (3)
O510.0283 (12)0.0276 (12)0.0485 (15)0.0060 (10)0.0102 (11)0.0120 (11)
C520.0315 (19)0.0280 (18)0.074 (3)0.0061 (15)0.0156 (19)0.0075 (19)
C530.072 (4)0.049 (3)0.076 (4)0.017 (3)0.005 (3)0.030 (3)
C540.078 (3)0.045 (2)0.055 (3)0.025 (2)0.029 (3)0.010 (2)
C550.037 (2)0.047 (2)0.053 (2)0.0157 (18)0.0166 (19)0.0128 (19)
Geometric parameters (Å, º) top
Yb—C12.521 (3)C24—C311.489 (5)
Yb—C192.518 (3)C25—C261.397 (5)
Yb—O412.396 (3)C25—C301.402 (5)
Yb—O512.427 (2)C26—C271.392 (5)
Yb—C83.127 (3)C26—H26A0.9500
Yb—C263.148 (3)C27—C281.380 (6)
C1—C21.417 (5)C27—H27A0.9500
C1—C61.420 (5)C28—C291.372 (6)
C2—C31.411 (5)C28—H28A0.9500
C2—C71.487 (5)C29—C301.397 (5)
C3—C41.383 (6)C29—H29A0.9500
C3—H3A0.9500C30—H30A0.9500
C4—C51.381 (6)C31—C361.396 (5)
C4—H4A0.9500C31—C321.415 (5)
C5—C61.406 (5)C32—C331.387 (5)
C5—H5A0.9500C32—H32A0.9500
C6—C131.491 (5)C33—C341.381 (6)
C7—C81.398 (5)C33—H33A0.9500
C7—C121.407 (5)C34—C351.391 (6)
C8—C91.392 (5)C34—H34A0.9500
C8—H8A0.9500C35—C361.389 (5)
C9—C101.391 (5)C35—H35A0.9500
C9—H9A0.9500C36—H36A0.9500
C10—C111.382 (6)O41—C451.435 (6)
C10—H10A0.9500O41—C421.454 (4)
C11—C121.388 (6)C42—C431.503 (6)
C11—H11A0.9500C42—H42A0.9900
C12—H12A0.9500C42—H42B0.9900
C13—C181.391 (5)C43—C441.521 (7)
C13—C141.397 (5)C43—H43A0.9900
C14—C151.379 (7)C43—H43B0.9900
C14—H14A0.9500C44—C451.473 (7)
C15—C161.382 (8)C44—H44A0.9900
C15—H15A0.9500C44—H44B0.9900
C16—C171.400 (7)C45—H45A0.9900
C16—H16A0.9500C45—H45B0.9900
C17—C181.384 (6)O51—C521.438 (4)
C17—H17A0.9500O51—C551.453 (4)
C18—H18A0.9500C52—C531.491 (7)
C19—C201.413 (5)C52—H52A0.9900
C19—C241.422 (5)C52—H52B0.9900
C20—C211.396 (5)C53—C541.514 (8)
C20—C251.500 (5)C53—H53A0.9900
C21—C221.381 (5)C53—H53B0.9900
C21—H21A0.9500C54—C551.514 (6)
C22—C231.387 (5)C54—H54A0.9900
C22—H22A0.9500C54—H54B0.9900
C23—C241.402 (5)C55—H55A0.9900
C23—H23A0.9500C55—H55B0.9900
C1—Yb—C19129.79 (11)C26—C25—C30117.7 (3)
O41—Yb—O5178.34 (9)C26—C25—C20120.1 (3)
C1—Yb—O4188.62 (10)C30—C25—C20122.2 (3)
C1—Yb—O51136.61 (10)C27—C26—C25121.2 (3)
C19—Yb—O41114.73 (10)C27—C26—Yb118.4 (2)
C19—Yb—O5192.82 (10)C25—C26—Yb86.7 (2)
Yb—C1—C2109.2 (2)C27—C26—H26A119.4
Yb—C1—C6126.3 (2)C25—C26—H26A119.4
C2—C1—C6115.0 (3)Yb—C26—H26A64.8
Yb—C19—C20114.8 (2)C28—C27—C26120.2 (4)
Yb—C19—C24127.0 (2)C28—C27—H27A119.9
C20—C19—C24115.2 (3)C26—C27—H27A119.9
O41—Yb—C8106.56 (9)C29—C28—C27119.7 (4)
O51—Yb—C882.39 (9)C29—C28—H28A120.2
C19—Yb—C8136.52 (10)C27—C28—H28A120.2
C1—Yb—C861.85 (10)C28—C29—C30120.8 (4)
O41—Yb—C26177.54 (9)C28—C29—H29A119.6
O51—Yb—C26101.35 (9)C30—C29—H29A119.6
C19—Yb—C2662.82 (10)C29—C30—C25120.3 (4)
C1—Yb—C2693.23 (10)C29—C30—H30A119.8
C8—Yb—C2675.77 (9)C25—C30—H30A119.8
C3—C2—C1122.4 (3)C36—C31—C32117.4 (3)
C3—C2—C7118.7 (3)C36—C31—C24120.3 (3)
C1—C2—C7118.9 (3)C32—C31—C24122.3 (3)
C4—C3—C2119.9 (4)C33—C32—C31120.9 (3)
C4—C3—H3A120.0C33—C32—H32A119.6
C2—C3—H3A120.0C31—C32—H32A119.6
C5—C4—C3120.0 (3)C34—C33—C32120.7 (3)
C5—C4—H4A120.0C34—C33—H33A119.7
C3—C4—H4A120.0C32—C33—H33A119.7
C4—C5—C6120.0 (4)C33—C34—C35119.2 (4)
C4—C5—H5A120.0C33—C34—H34A120.4
C6—C5—H5A120.0C35—C34—H34A120.4
C5—C6—C1122.6 (3)C36—C35—C34120.5 (4)
C5—C6—C13118.5 (3)C36—C35—H35A119.7
C1—C6—C13119.0 (3)C34—C35—H35A119.7
C8—C7—C12117.0 (3)C35—C36—C31121.2 (3)
C8—C7—C2119.9 (3)C35—C36—H36A119.4
C12—C7—C2123.0 (3)C31—C36—H36A119.4
C9—C8—C7121.9 (3)C45—O41—C42109.2 (3)
C9—C8—Yb119.4 (3)C45—O41—Yb126.5 (3)
C7—C8—Yb85.0 (2)C42—O41—Yb124.0 (2)
C9—C8—H8A119.0O41—C42—C43105.9 (3)
C7—C8—H8A119.0O41—C42—H42A110.6
Yb—C8—H8A65.4C43—C42—H42A110.6
C10—C9—C8119.9 (4)O41—C42—H42B110.6
C10—C9—H9A120.1C43—C42—H42B110.6
C8—C9—H9A120.1H42A—C42—H42B108.7
C11—C10—C9119.2 (4)C42—C43—C44104.4 (3)
C11—C10—H10A120.4C42—C43—H43A110.9
C9—C10—H10A120.4C44—C43—H43A110.9
C10—C11—C12120.9 (4)C42—C43—H43B110.9
C10—C11—H11A119.6C44—C43—H43B110.9
C12—C11—H11A119.6H43A—C43—H43B108.9
C11—C12—C7121.1 (3)C45—C44—C43102.9 (4)
C11—C12—H12A119.5C45—C44—H44A111.2
C7—C12—H12A119.5C43—C44—H44A111.2
C18—C13—C14117.5 (4)C45—C44—H44B111.2
C18—C13—C6119.9 (3)C43—C44—H44B111.2
C14—C13—C6122.6 (4)H44A—C44—H44B109.1
C15—C14—C13121.7 (4)O41—C45—C44107.7 (4)
C15—C14—H14A119.1O41—C45—H45A110.2
C13—C14—H14A119.1C44—C45—H45A110.2
C14—C15—C16120.0 (4)O41—C45—H45B110.2
C14—C15—H15A120.0C44—C45—H45B110.2
C16—C15—H15A120.0H45A—C45—H45B108.5
C15—C16—C17119.4 (5)C52—O51—C55105.6 (3)
C15—C16—H16A120.3C52—O51—Yb127.9 (2)
C17—C16—H16A120.3C55—O51—Yb126.3 (2)
C18—C17—C16119.7 (5)O51—C52—C53103.6 (4)
C18—C17—H17A120.1O51—C52—H52A111.0
C16—C17—H17A120.1C53—C52—H52A111.0
C17—C18—C13121.5 (4)O51—C52—H52B111.0
C17—C18—H18A119.2C53—C52—H52B111.0
C13—C18—H18A119.2H52A—C52—H52B109.0
C20—C19—C24115.2 (3)C52—C53—C54103.5 (4)
C20—C19—Yb114.8 (2)C52—C53—H53A111.1
C24—C19—Yb127.0 (2)C54—C53—H53A111.1
C21—C20—C19122.7 (3)C52—C53—H53B111.1
C21—C20—C25119.2 (3)C54—C53—H53B111.1
C19—C20—C25118.1 (3)H53A—C53—H53B109.0
C22—C21—C20120.3 (3)C53—C54—C55104.4 (4)
C22—C21—H21A119.8C53—C54—H54A110.9
C20—C21—H21A119.8C55—C54—H54A110.9
C21—C22—C23119.5 (3)C53—C54—H54B110.9
C21—C22—H22A120.3C55—C54—H54B110.9
C23—C22—H22A120.3H54A—C54—H54B108.9
C22—C23—C24120.3 (3)O51—C55—C54106.3 (3)
C22—C23—H23A119.8O51—C55—H55A110.5
C24—C23—H23A119.8C54—C55—H55A110.5
C23—C24—C19121.9 (3)O51—C55—H55B110.5
C23—C24—C31119.0 (3)C54—C55—H55B110.5
C19—C24—C31119.0 (3)H55A—C55—H55B108.7
 

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