organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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ISSN: 2056-9890

4-[4-(Methyl­sulfan­yl)phen­yl]-6-phenyl-2,2′-bi­pyridine

aChemistry Department, University of Canterbury, PO Box 4800, Christchurch, New Zealand, and bDipartimento de Chimica, Università degli Studi di Ferrara, Ferrara 44100, Italy
*Correspondence e-mail: matthew.polson@canterbury.ac.nz

(Received 2 November 2007; accepted 5 December 2007; online 18 December 2007)

The structure of the title compound, C23H18N2S, is revealed by X-ray diffraction to be almost planar over all four aromatic rings; the pendant rings are at angles of 10.18, 14.12 and 15.42° relative to the central pyridine ring for the 4-methylsulfanyl, 2-pyridyl and 6-phenyl rings, respectively. The 2,6-aromatic substituents are disordered over two sites in a 0.6:0.4 occupancy ratio.

Related literature

For related literature, see: Fitchett et al. (2005[Fitchett, C. M., Richardson, C. & Steel, P. J. (2005). Org. Biomol. Chem. 3, 498-502.]).

[Scheme 1]

Experimental

Crystal data
  • C23H18N2S

  • Mr = 354.45

  • Monoclinic, P 21 /c

  • a = 19.189 (3) Å

  • b = 5.3617 (8) Å

  • c = 17.084 (3) Å

  • β = 92.262 (9)°

  • V = 1756.3 (5) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 0.19 mm−1

  • T = 93 (2) K

  • 0.45 × 0.17 × 0.04 mm

Data collection
  • Bruker APEXII CCD area-detector diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 2007[Bruker (2007). APEX2 (Version 2.1-4), SAINT (Version 7.34A) and SADABS (Version 2004/1). Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.599, Tmax = 0.992

  • 19871 measured reflections

  • 3118 independent reflections

  • 1442 reflections with I > 2σ(I)

  • Rint = 0.121

Refinement
  • R[F2 > 2σ(F2)] = 0.063

  • wR(F2) = 0.161

  • S = 0.93

  • 3118 reflections

  • 236 parameters

  • H-atom parameters constrained

  • Δρmax = 0.50 e Å−3

  • Δρmin = −0.35 e Å−3

Data collection: APEX2 (Bruker, 2007[Bruker (2007). APEX2 (Version 2.1-4), SAINT (Version 7.34A) and SADABS (Version 2004/1). Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 2007[Bruker (2007). APEX2 (Version 2.1-4), SAINT (Version 7.34A) and SADABS (Version 2004/1). Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1990[Sheldrick, G. M. (1990). Acta Cryst. A46, 467-473.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997[Sheldrick, G. M. (1997). SHELXL97. University of Göttingen, Germany.]); molecular graphics: ORTEP-3 for Windows (Version 1.08; Farrugia, 1997[Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565.]); software used to prepare material for publication: publCIF (Westrip, 2008[Westrip, S. P. (2008). publCIF. In preparation.]).

Supporting information


Comment top

The use of Self Assemblied Monolayers (SAMs) in the fabrication of molecular devices is a rapidly expanding field. To incorporate the useful photophysical properties of iridium complexes into a SAM, ligands must be capable of attaching to a surface. The compound (1), a bipyridine based ligand, includes a protected thiol group for attachment to a gold surface and a phenyl group for cyclometallation. Typically bipyridine ligands crystallize with the pyridine N atoms in a s-trans arrangement (Fitchett et al., 2005). This is attributed to reduction of C—H/H—C interactions. Here, the pyridine ring and the phenyl ring crystallize in identical conformations, leading to disorder. If C—H/H—C interactions were the dominant force for the arrangement of the ring, one would expect the phenyl ring to adopt a different arrangement due to the additional interaction. This implies that the dominant force for the arrangement of the rings is the attractive C—H/N interaction.

Related literature top

For related literature, see: Fitchett et al. (2005).

Experimental top

To a solution of 4-(methylsulfanyl)benzaldehyde (5 g), acetophenone (4.5 g), methanol (300 ml) and ammonia (0.81 g/ml, 50 ml) was added a sodium hydroxide solution (1.5 g in 50 ml water) with stirring. Overnight a precipitate of the condensation product formed. This was filtered, air dried and was used in the next step without further purification. This compound (5 g) was ground in a mortar and pestle with 2-acetylpyridine (2.5 g) and sodium hydroxide (0.83 g) until the mixture became a solid again. Excess ammonium hydroxide was added and the mixture dissolved in glacial acetic acid (50 ml) and was refluxed with stirring for 4 h. On cooling, the solution was poured into water (200 ml) and extracted with dichloromethane (3 x 50 ml). Chromatography on silica gel with dichloromethane/methanol (95:5) yielded the pure product (1). Single crystals suitable for X-ray diffraction formed on slow evaporation from dichloromethane solution. Yield = 2.3 g (25%). Spectroscopic data: 1H NMR (CDCl3): δ 2.54 (3H, s, CH3S), 7.35 (1H, ddd, py5'), 7.37 (2H, d, thio-ph3,5), 7.46 (1H, t, ph4), 7.53 (2H, dd, thio-ph2,6), 7.77 (2H, d, ph3,5), 7.87 (1H, td, py4'), 7.95 (1H, d, py5), 8.20 (2H, d, ph2,6), 8.63 (1H, d, py3), 8.68 (1H, d, py3'), 8.72 (1H, dd, py6'); 13C NMR (CDCl3): δ 15.5, 117.1, 118.1, 121.6, 123.9, 126.5, 127.1, 127.5, 128.7, 129.1, 135.0, 137.1, 139.4, 140.1, 148.8, 149.5, 156.0, 156.2, 157.2.

Refinement top

The 2-pyridine and 6-phenyl rings are disordered in a 60/40 ratio over the two possible positions. The pyridine ring however always adopts a s-trans arrangement to the central pyridine nitrogen, presumably to minimize hydrogen/hydrogen repulsions.

Structure description top

The use of Self Assemblied Monolayers (SAMs) in the fabrication of molecular devices is a rapidly expanding field. To incorporate the useful photophysical properties of iridium complexes into a SAM, ligands must be capable of attaching to a surface. The compound (1), a bipyridine based ligand, includes a protected thiol group for attachment to a gold surface and a phenyl group for cyclometallation. Typically bipyridine ligands crystallize with the pyridine N atoms in a s-trans arrangement (Fitchett et al., 2005). This is attributed to reduction of C—H/H—C interactions. Here, the pyridine ring and the phenyl ring crystallize in identical conformations, leading to disorder. If C—H/H—C interactions were the dominant force for the arrangement of the ring, one would expect the phenyl ring to adopt a different arrangement due to the additional interaction. This implies that the dominant force for the arrangement of the rings is the attractive C—H/N interaction.

For related literature, see: Fitchett et al. (2005).

Computing details top

Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 1990); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Version 1.08; Farrugia, 1997); software used to prepare material for publication: publCIF (Westrip, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of (1), showing displacement ellipsoids at the 50% probability level.
4-[4-(Methylsulfanyl)phenyl]-6-phenyl-2,2'-bipyridine top
Crystal data top
C23H18N2SF(000) = 744
Mr = 354.45Dx = 1.341 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 1819 reflections
a = 19.189 (3) Åθ = 2.7–25.9°
b = 5.3617 (8) ŵ = 0.19 mm1
c = 17.084 (3) ÅT = 93 K
β = 92.262 (9)°Plate, yellow
V = 1756.3 (5) Å30.45 × 0.17 × 0.04 mm
Z = 4
Data collection top
Bruker APEXII CCD area-detector
diffractometer
3118 independent reflections
Radiation source: sealed tube1442 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.121
φ and ω scansθmax = 25.1°, θmin = 2.4°
Absorption correction: multi-scan
(SADABS; Bruker, 2007)
h = 2222
Tmin = 0.599, Tmax = 0.992k = 66
19871 measured reflectionsl = 2020
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)] = 0.063Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.161H-atom parameters constrained
S = 0.93 w = 1/[σ2(Fo2) + (0.0562P)2 + 0.5007P]
where P = (Fo2 + 2Fc2)/3
3118 reflections(Δ/σ)max < 0.001
236 parametersΔρmax = 0.50 e Å3
0 restraintsΔρmin = 0.35 e Å3
Crystal data top
C23H18N2SV = 1756.3 (5) Å3
Mr = 354.45Z = 4
Monoclinic, P21/cMo Kα radiation
a = 19.189 (3) ŵ = 0.19 mm1
b = 5.3617 (8) ÅT = 93 K
c = 17.084 (3) Å0.45 × 0.17 × 0.04 mm
β = 92.262 (9)°
Data collection top
Bruker APEXII CCD area-detector
diffractometer
3118 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2007)
1442 reflections with I > 2σ(I)
Tmin = 0.599, Tmax = 0.992Rint = 0.121
19871 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0630 restraints
wR(F2) = 0.161H-atom parameters constrained
S = 0.93Δρmax = 0.50 e Å3
3118 reflectionsΔρmin = 0.35 e Å3
236 parameters
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*/UeqOcc. (<1)
C100.7765 (2)0.5910 (7)0.4911 (2)0.0262 (10)
C110.8384 (2)0.6255 (8)0.5330 (3)0.0467 (13)
H110.87880.53330.52040.056*
C120.8411 (2)0.7978 (9)0.5941 (3)0.0575 (15)
H120.88320.82050.62450.069*
C130.7843 (2)0.9318 (8)0.6101 (2)0.0383 (11)
H130.78621.05160.65110.046*
C140.7242 (2)0.8947 (9)0.5672 (3)0.0440 (12)
H140.68390.98830.57920.053*
N150.71985 (18)0.7258 (8)0.5069 (2)0.0428 (10)0.60
C150.71985 (18)0.7258 (8)0.5069 (2)0.0428 (10)0.40
H150.67750.70460.47690.051*0.40
N200.82507 (15)0.2544 (7)0.41731 (17)0.0296 (8)
C200.7730 (2)0.4149 (8)0.4222 (2)0.0278 (10)
C210.7176 (2)0.4300 (8)0.3674 (2)0.0300 (10)
H210.68110.54710.37410.036*
C220.71595 (19)0.2711 (8)0.3022 (2)0.0269 (9)
C230.7708 (2)0.1064 (8)0.2974 (2)0.0322 (11)
H230.77200.00400.25400.039*
C240.8246 (2)0.0983 (8)0.3549 (2)0.0314 (10)
C300.8832 (2)0.0776 (8)0.3508 (2)0.0306 (10)
C310.9434 (2)0.0504 (9)0.3971 (3)0.0453 (13)
H310.94690.08560.43270.054*
C320.9981 (3)0.2125 (10)0.3934 (3)0.0545 (14)
H321.03870.18960.42620.065*
C330.9939 (2)0.4123 (9)0.3407 (3)0.0454 (13)
H331.03140.52610.33610.054*
C340.9338 (2)0.4371 (9)0.2964 (3)0.0441 (12)
H340.92970.57510.26170.053*
N350.87914 (19)0.2752 (8)0.2989 (2)0.0354 (10)0.40
C350.87914 (19)0.2752 (8)0.2989 (2)0.0354 (10)0.60
H350.83890.29790.26550.042*0.60
C400.65707 (19)0.2792 (8)0.2432 (2)0.0283 (10)
C410.6070 (2)0.4625 (8)0.2429 (2)0.0380 (11)
H410.61180.59300.28030.046*
C420.5494 (2)0.4669 (8)0.1906 (2)0.0393 (12)
H420.51630.59810.19280.047*
C430.54081 (19)0.2767 (8)0.1349 (2)0.0302 (10)
C440.5919 (2)0.0955 (9)0.1327 (3)0.0442 (12)
H440.58800.03210.09430.053*
C450.6486 (2)0.0961 (8)0.1857 (3)0.0411 (12)
H450.68270.03180.18260.049*
S400.46881 (5)0.2541 (2)0.06834 (6)0.0347 (3)
C460.4188 (2)0.5257 (8)0.0889 (2)0.0422 (12)
H46A0.40830.52790.14460.063*
H46B0.37520.52320.05710.063*
H46C0.44560.67520.07630.063*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C100.032 (2)0.030 (2)0.016 (2)0.001 (2)0.0034 (18)0.005 (2)
C110.048 (3)0.050 (3)0.041 (3)0.015 (2)0.006 (2)0.015 (3)
C120.056 (3)0.071 (4)0.044 (3)0.019 (3)0.024 (2)0.021 (3)
C130.052 (3)0.043 (3)0.019 (3)0.003 (2)0.004 (2)0.007 (2)
C140.046 (3)0.050 (3)0.037 (3)0.014 (2)0.004 (2)0.019 (3)
N150.043 (2)0.058 (3)0.028 (2)0.007 (2)0.0014 (17)0.019 (2)
C150.043 (2)0.058 (3)0.028 (2)0.007 (2)0.0014 (17)0.019 (2)
N200.0384 (19)0.037 (2)0.0137 (18)0.003 (2)0.0057 (14)0.0044 (19)
C200.037 (2)0.034 (3)0.012 (2)0.001 (2)0.0076 (19)0.002 (2)
C210.042 (3)0.029 (3)0.019 (2)0.000 (2)0.002 (2)0.001 (2)
C220.039 (2)0.029 (2)0.013 (2)0.002 (2)0.0067 (17)0.004 (2)
C230.048 (3)0.036 (3)0.013 (2)0.002 (2)0.003 (2)0.001 (2)
C240.043 (3)0.029 (3)0.022 (3)0.002 (2)0.006 (2)0.005 (2)
C300.039 (3)0.037 (3)0.016 (2)0.003 (2)0.0086 (19)0.006 (2)
C310.056 (3)0.056 (3)0.024 (3)0.013 (3)0.001 (2)0.003 (2)
C320.064 (3)0.071 (4)0.029 (3)0.018 (3)0.000 (2)0.007 (3)
C330.056 (3)0.046 (3)0.035 (3)0.012 (3)0.011 (2)0.013 (3)
C340.062 (3)0.040 (3)0.032 (3)0.003 (3)0.018 (3)0.003 (2)
N350.048 (2)0.036 (2)0.023 (2)0.006 (2)0.0093 (18)0.000 (2)
C350.048 (2)0.036 (2)0.023 (2)0.006 (2)0.0093 (18)0.000 (2)
C400.039 (2)0.031 (3)0.016 (2)0.005 (2)0.0059 (17)0.003 (2)
C410.053 (3)0.045 (3)0.016 (3)0.005 (2)0.002 (2)0.010 (2)
C420.055 (3)0.041 (3)0.022 (3)0.012 (2)0.001 (2)0.007 (2)
C430.038 (2)0.029 (3)0.024 (2)0.005 (2)0.0013 (18)0.004 (2)
C440.056 (3)0.040 (3)0.036 (3)0.006 (3)0.008 (2)0.011 (2)
C450.052 (3)0.034 (3)0.037 (3)0.010 (2)0.004 (2)0.009 (2)
S400.0459 (6)0.0359 (6)0.0222 (6)0.0007 (6)0.0005 (4)0.0047 (6)
C460.049 (3)0.053 (3)0.024 (3)0.009 (2)0.003 (2)0.003 (2)
Geometric parameters (Å, º) top
C10—N151.342 (5)C31—C321.367 (6)
C10—C111.374 (5)C31—H310.9500
C10—C201.509 (5)C32—C331.399 (6)
C11—C121.394 (6)C32—H320.9500
C11—H110.9500C33—C341.360 (6)
C12—C131.343 (6)C33—H330.9500
C12—H120.9500C34—N351.364 (5)
C13—C141.357 (5)C34—H340.9500
C13—H130.9500C40—C411.375 (5)
C14—N151.371 (5)C40—C451.393 (5)
C14—H140.9500C41—C421.392 (5)
N20—C201.324 (5)C41—H410.9500
N20—C241.355 (5)C42—C431.401 (6)
C20—C211.391 (5)C42—H420.9500
C21—C221.402 (5)C43—C441.381 (6)
C21—H210.9500C43—S401.758 (4)
C22—C231.378 (5)C44—C451.388 (6)
C22—C401.485 (5)C44—H440.9500
C23—C241.398 (5)C45—H450.9500
C23—H230.9500S40—C461.787 (4)
C24—C301.472 (5)C46—H46A0.9800
C30—C311.380 (6)C46—H46B0.9800
C30—N351.382 (5)C46—H46C0.9800
N15—C10—C11120.9 (4)C30—C31—H31118.9
N15—C10—C20118.8 (4)C31—C32—C33119.5 (5)
C11—C10—C20120.1 (4)C31—C32—H32120.3
C10—C11—C12119.0 (4)C33—C32—H32120.3
C10—C11—H11120.5C34—C33—C32117.3 (5)
C12—C11—H11120.5C34—C33—H33121.3
C13—C12—C11120.1 (4)C32—C33—H33121.3
C13—C12—H12120.0C33—C34—N35123.8 (5)
C11—C12—H12120.0C33—C34—H34118.1
C12—C13—C14119.4 (4)N35—C34—H34118.1
C12—C13—H13120.3C34—N35—C30118.9 (4)
C14—C13—H13120.3C41—C40—C45116.1 (4)
C13—C14—N15121.8 (4)C41—C40—C22122.4 (4)
C13—C14—H14119.1C45—C40—C22121.5 (4)
N15—C14—H14119.1C40—C41—C42123.4 (4)
C10—N15—C14118.8 (4)C40—C41—H41118.3
C20—N20—C24117.9 (3)C42—C41—H41118.3
N20—C20—C21123.7 (4)C41—C42—C43119.5 (4)
N20—C20—C10116.4 (3)C41—C42—H42120.2
C21—C20—C10119.9 (4)C43—C42—H42120.2
C20—C21—C22119.4 (4)C44—C43—C42117.7 (4)
C20—C21—H21120.3C44—C43—S40118.3 (3)
C22—C21—H21120.3C42—C43—S40123.9 (3)
C23—C22—C21116.4 (3)C43—C44—C45121.4 (4)
C23—C22—C40122.7 (4)C43—C44—H44119.3
C21—C22—C40120.9 (4)C45—C44—H44119.3
C22—C23—C24121.5 (4)C44—C45—C40121.8 (4)
C22—C23—H23119.3C44—C45—H45119.1
C24—C23—H23119.3C40—C45—H45119.1
N20—C24—C23121.1 (4)C43—S40—C46103.4 (2)
N20—C24—C30116.8 (4)S40—C46—H46A109.5
C23—C24—C30122.1 (4)S40—C46—H46B109.5
C31—C30—N35118.2 (4)H46A—C46—H46B109.5
C31—C30—C24121.9 (4)S40—C46—H46C109.5
N35—C30—C24119.8 (4)H46A—C46—H46C109.5
C32—C31—C30122.2 (5)H46B—C46—H46C109.5
C32—C31—H31118.9

Experimental details

Crystal data
Chemical formulaC23H18N2S
Mr354.45
Crystal system, space groupMonoclinic, P21/c
Temperature (K)93
a, b, c (Å)19.189 (3), 5.3617 (8), 17.084 (3)
β (°) 92.262 (9)
V3)1756.3 (5)
Z4
Radiation typeMo Kα
µ (mm1)0.19
Crystal size (mm)0.45 × 0.17 × 0.04
Data collection
DiffractometerBruker APEXII CCD area-detector
Absorption correctionMulti-scan
(SADABS; Bruker, 2007)
Tmin, Tmax0.599, 0.992
No. of measured, independent and
observed [I > 2σ(I)] reflections
19871, 3118, 1442
Rint0.121
(sin θ/λ)max1)0.596
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.063, 0.161, 0.93
No. of reflections3118
No. of parameters236
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.50, 0.35

Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 1990), SHELXL97 (Sheldrick, 1997), ORTEP-3 for Windows (Version 1.08; Farrugia, 1997), publCIF (Westrip, 2008).

 

Acknowledgements

We thank the Foundation of Research Science and Technology for funding. FS also thanks the EC for funding (grant G5RD-CT-2002-00776, MWFM) and PJS also thanks the Royal Society of New Zealand for the award of a James Cook Research Fellowship.

References

First citationBruker (2007). APEX2 (Version 2.1-4), SAINT (Version 7.34A) and SADABS (Version 2004/1). Bruker AXS Inc., Madison, Wisconsin, USA.  Google Scholar
First citationFarrugia, L. J. (1997). J. Appl. Cryst. 30, 565.  CrossRef IUCr Journals Google Scholar
First citationFitchett, C. M., Richardson, C. & Steel, P. J. (2005). Org. Biomol. Chem. 3, 498–502.  Web of Science CSD CrossRef PubMed CAS Google Scholar
First citationSheldrick, G. M. (1990). Acta Cryst. A46, 467–473.  CrossRef CAS Web of Science IUCr Journals Google Scholar
First citationSheldrick, G. M. (1997). SHELXL97. University of Göttingen, Germany.  Google Scholar
First citationWestrip, S. P. (2008). publCIF. In preparation.  Google Scholar

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