organic compounds
5,11,17,23-Tetrakis(chloromethyl)-25,26,27,28-tetrapropoxycalix[4]arene
aUniversity of Bremen, Department of Chemistry, Leobener Strasse, NW 2C, D-28359 Bremen, Germany, and bYoungstown State University, One University Plaza, Youngstown, OH 44555-3663, USA
*Correspondence e-mail: vazov@uni-bremen.de
The title calix[4]arene, C44H52Cl4O4, displays the 1,3-alternate conformation with crystallographically imposed twofold symmetry. Four phenolic rings of the calixarene backbone are tilted into the calix cavity, making dihedral angles of 77.42 (2) and 77.71 (2)° with the plane of the four bridging methylene C atoms. Pairs of opposite aromatic rings make dihedral angles of 25.16 (3) and 24.58 (4)° with each other. In the crystal, the calixarene molecules pack with the formation of infinite columns along the b axis. The crystal packing shows a network of C—H⋯Cl contacts, which can be considered as non-classical hydrogen bonds.
Related literature
For calixarene derivatives and their applications, see: Gutsche (2008); Ikeda & Shinkai (1997). For the use of in crystal engineering, see: Dalgrano et al. (2007). For the previous synthesis of the title compound, see: Ikeda & Shinkai (1994a). For its application in the formation of nanotubes, see: Ikeda & Shinkai (1994b). For reviews on weak non-classical hydrogen bonding, see: Desiraju & Steiner (1999); Steiner (2002); Desiraju (2005).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006); software used to prepare material for publication: CRYSTALS, enCIFer (Allen et al., 2004) and publCIF (Westrip, 2010).
Supporting information
10.1107/S160053681100660X/rk2266sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681100660X/rk2266Isup2.hkl
A solution of 25,26,27,28–tetrapropoxycalix[4]arene (0.108 g, 0.169 mmol), paraformaldehyde (0.115 g, 3.83 mmol), glacial acetic acid (1.3 ml), and conc. H3PO4 (1.3 ml) in dioxane (5 ml) was stirred for 2 h at 353 K. After addition of conc. HCl (1.3 ml, 16.1 mmol) the solution was stirred for additional 16 h at 353 K. The mixture was concentrated under vacuum up to ca 3 ml, poured into ice/water (100 ml) and extracted with CH2Cl2 (3×20 ml). The combined organic phases were washed with water and brine, dried (Na2SO4), and evaporated to dryness. The resulting oil was dissolved in a small amount of CH2Cl2 and MeOH was slowly added. The precipitate was filtered off, washed with cold MeOH, dried under vacuum, and purified by
to yield 80 mg (0.102 mmol, 60%) of product as a white crystalline powder.Rf = 0.41 (CH2Cl2/PE, 1:1). Mp: 562–565 K (CHCl3/heptane, decomp.); Lit: 556–558 K (Ikeda & Shinkai, 1994a). 1H NMR (200 MHz, CDCl3): δ 1.02 (t, J = 7.5 Hz, 12 H), 1.78 (tq, J = 7.2, 7.5 Hz, 8 H), 3.55 (s, 8 H), 3.63 (t, J = 7.2 Hz, 8 H), 4.43 (s, 8 H), 7.01 (s, 8 H). 13C NMR (50 MHz, CDCl3): δ 10.6, 23.8, 36.0, 46.7, 73.8, 129.8, 130.5, 133.3, 156.7. HR–MS (EI, 70 eV): m/z 784.25829 (M+, C44H52Cl4O4+, calcd. 784.26197).
X–ray quality crystals were grown by slow evaporation of a chloroform/heptane solution and appeared as large (up to 1–2 mm) transparent blocks.
All non–hydrogen atoms were refined with anisotropic displacement parameters. All H atoms were located in electron difference density maps and initially refined with soft restraints on the bond lengths and angles to regularize their geometry (C—H in the range 0.93Å–0.98Å) and Uiso(H) (in the range 1.2–1.5 times Ueq of the parent atom), after which the positions were refined with riding constraints.
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006); software used to prepare material for publication: CRYSTALS (Betteridge et al., 2003), enCIFer (Allen et al., 2004) and publCIF (Westrip, 2010).C44H52Cl4O4 | F(000) = 1664 |
Mr = 786.66 | Dx = 1.251 Mg m−3 |
Monoclinic, C2/c | Melting point = 562–565 K |
Hall symbol: -C 2yc | Mo Kα radiation, λ = 0.71073 Å |
a = 23.104 (3) Å | Cell parameters from 6719 reflections |
b = 11.5871 (15) Å | θ = 2.6–31.2° |
c = 17.618 (2) Å | µ = 0.32 mm−1 |
β = 117.655 (2)° | T = 100 K |
V = 4177.7 (9) Å3 | Plate, colourless |
Z = 4 | 0.49 × 0.31 × 0.15 mm |
Bruker Kappa APEXII CCD diffractometer | 6176 independent reflections |
Radiation source: fine–focus sealed tube | 5280 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.019 |
ω scans | θmax = 31.3°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −32→21 |
Tmin = 0.658, Tmax = 0.746 | k = −16→16 |
15796 measured reflections | l = −25→24 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.045 | H-atom parameters constrained |
wR(F2) = 0.119 | Method: Modified Sheldrick w = 1/[σ2(F2) + (0.06P)2 + 6.5P], where P = (max(Fo2,0) + 2Fc2)/3 |
S = 0.97 | (Δ/σ)max = 0.001 |
6176 reflections | Δρmax = 0.84 e Å−3 |
235 parameters | Δρmin = −1.05 e Å−3 |
0 restraints |
C44H52Cl4O4 | V = 4177.7 (9) Å3 |
Mr = 786.66 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 23.104 (3) Å | µ = 0.32 mm−1 |
b = 11.5871 (15) Å | T = 100 K |
c = 17.618 (2) Å | 0.49 × 0.31 × 0.15 mm |
β = 117.655 (2)° |
Bruker Kappa APEXII CCD diffractometer | 6176 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 5280 reflections with I > 2σ(I) |
Tmin = 0.658, Tmax = 0.746 | Rint = 0.019 |
15796 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.119 | H-atom parameters constrained |
S = 0.97 | Δρmax = 0.84 e Å−3 |
6176 reflections | Δρmin = −1.05 e Å−3 |
235 parameters |
x | y | z | Uiso*/Ueq | ||
C1 | 0.50019 (6) | 0.26912 (11) | 0.95475 (8) | 0.0164 | |
C2 | 0.54654 (6) | 0.20061 (11) | 0.93269 (8) | 0.0149 | |
C3 | 0.53732 (6) | 0.08279 (11) | 0.91462 (8) | 0.0167 | |
C4 | 0.57355 (6) | 0.02376 (11) | 0.88215 (8) | 0.0170 | |
C5 | 0.61874 (6) | 0.08366 (11) | 0.86547 (8) | 0.0168 | |
C6 | 0.62966 (6) | 0.20102 (11) | 0.88333 (8) | 0.0148 | |
C7 | 0.67218 (6) | 0.27004 (11) | 0.85493 (8) | 0.0163 | |
C8 | 0.62887 (6) | 0.33794 (11) | 0.77464 (8) | 0.0143 | |
C9 | 0.61781 (6) | 0.45548 (11) | 0.77855 (8) | 0.0160 | |
C10 | 0.57288 (6) | 0.51528 (11) | 0.70662 (8) | 0.0164 | |
C11 | 0.53667 (6) | 0.45584 (11) | 0.63009 (8) | 0.0159 | |
C12 | 0.54589 (6) | 0.33795 (11) | 0.62379 (8) | 0.0144 | |
C13 | 0.59403 (6) | 0.28149 (10) | 0.69587 (8) | 0.0137 | |
C14 | 0.59478 (6) | 0.25714 (10) | 0.91977 (8) | 0.0145 | |
C15 | 0.55982 (8) | −0.10064 (12) | 0.85763 (10) | 0.0239 | |
C16 | 0.56055 (8) | 0.64034 (12) | 0.71362 (10) | 0.0231 | |
O17 | 0.60538 (4) | 0.37378 (8) | 0.93772 (6) | 0.0152 | |
C18 | 0.65446 (7) | 0.39656 (12) | 1.02414 (8) | 0.0203 | |
C19 | 0.66500 (8) | 0.52464 (13) | 1.03584 (10) | 0.0267 | |
C20 | 0.71259 (8) | 0.55535 (15) | 1.12794 (11) | 0.0327 | |
O21 | 0.60378 (5) | 0.16480 (8) | 0.69063 (6) | 0.0160 | |
C22 | 0.65246 (7) | 0.13892 (11) | 0.66358 (9) | 0.0186 | |
C23 | 0.64766 (7) | 0.01154 (13) | 0.64361 (10) | 0.0246 | |
C24 | 0.69974 (8) | −0.02954 (15) | 0.61997 (11) | 0.0314 | |
Cl25 | 0.61811 (3) | −0.19788 (3) | 0.93509 (3) | 0.0381 | |
Cl26 | 0.62004 (3) | 0.73262 (3) | 0.70485 (3) | 0.0407 | |
H11 | 0.5243 | 0.3212 | 1.0025 | 0.0157* | |
H12 | 0.4747 | 0.2162 | 0.9728 | 0.0143* | |
H31 | 0.5042 | 0.0438 | 0.9235 | 0.0150* | |
H51 | 0.6414 | 0.0427 | 0.8393 | 0.0158* | |
H72 | 0.7020 | 0.3210 | 0.9014 | 0.0138* | |
H71 | 0.6988 | 0.2163 | 0.8411 | 0.0144* | |
H91 | 0.6406 | 0.4933 | 0.8305 | 0.0136* | |
H111 | 0.5048 | 0.4966 | 0.5830 | 0.0128* | |
H151 | 0.5183 | −0.1218 | 0.8522 | 0.0232* | |
H152 | 0.5596 | −0.1137 | 0.8038 | 0.0233* | |
H162 | 0.5642 | 0.6536 | 0.7693 | 0.0219* | |
H161 | 0.5193 | 0.6646 | 0.6685 | 0.0223* | |
H181 | 0.6947 | 0.3556 | 1.0335 | 0.0207* | |
H182 | 0.6413 | 0.3680 | 1.0656 | 0.0205* | |
H192 | 0.6830 | 0.5531 | 0.9985 | 0.0289* | |
H191 | 0.6222 | 0.5628 | 1.0206 | 0.0279* | |
H201 | 0.7230 | 0.6366 | 1.1318 | 0.0433* | |
H203 | 0.7532 | 0.5123 | 1.1473 | 0.0441* | |
H202 | 0.6935 | 0.5370 | 1.1652 | 0.0450* | |
H221 | 0.6956 | 0.1595 | 0.7082 | 0.0178* | |
H222 | 0.6420 | 0.1815 | 0.6115 | 0.0173* | |
H231 | 0.6530 | −0.0287 | 0.6945 | 0.0258* | |
H232 | 0.6051 | −0.0045 | 0.5971 | 0.0253* | |
H242 | 0.6953 | −0.1109 | 0.6068 | 0.0429* | |
H241 | 0.7421 | −0.0116 | 0.6648 | 0.0429* | |
H243 | 0.6957 | 0.0125 | 0.5702 | 0.0441* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0182 (6) | 0.0177 (5) | 0.0144 (5) | 0.0010 (4) | 0.0086 (5) | 0.0009 (4) |
C2 | 0.0162 (6) | 0.0154 (5) | 0.0129 (5) | 0.0013 (4) | 0.0066 (5) | 0.0018 (4) |
C3 | 0.0173 (6) | 0.0153 (5) | 0.0169 (6) | −0.0003 (4) | 0.0076 (5) | 0.0026 (4) |
C4 | 0.0192 (6) | 0.0138 (5) | 0.0165 (5) | 0.0009 (4) | 0.0070 (5) | 0.0011 (4) |
C5 | 0.0185 (6) | 0.0150 (5) | 0.0169 (6) | 0.0029 (4) | 0.0084 (5) | 0.0017 (4) |
C6 | 0.0135 (5) | 0.0160 (5) | 0.0134 (5) | 0.0012 (4) | 0.0051 (4) | 0.0027 (4) |
C7 | 0.0144 (5) | 0.0181 (5) | 0.0160 (5) | 0.0007 (4) | 0.0066 (5) | 0.0021 (4) |
C8 | 0.0133 (5) | 0.0147 (5) | 0.0167 (5) | −0.0002 (4) | 0.0085 (5) | 0.0012 (4) |
C9 | 0.0172 (6) | 0.0152 (5) | 0.0170 (6) | −0.0020 (4) | 0.0092 (5) | −0.0009 (4) |
C10 | 0.0194 (6) | 0.0130 (5) | 0.0200 (6) | −0.0006 (4) | 0.0119 (5) | 0.0006 (4) |
C11 | 0.0166 (6) | 0.0147 (5) | 0.0172 (6) | 0.0008 (4) | 0.0086 (5) | 0.0026 (4) |
C12 | 0.0160 (6) | 0.0151 (5) | 0.0147 (5) | −0.0010 (4) | 0.0092 (5) | 0.0003 (4) |
C13 | 0.0148 (5) | 0.0125 (5) | 0.0167 (5) | −0.0002 (4) | 0.0098 (5) | 0.0008 (4) |
C14 | 0.0155 (6) | 0.0131 (5) | 0.0128 (5) | 0.0004 (4) | 0.0047 (4) | 0.0012 (4) |
C15 | 0.0292 (7) | 0.0166 (6) | 0.0248 (7) | −0.0011 (5) | 0.0117 (6) | −0.0009 (5) |
C16 | 0.0308 (7) | 0.0146 (6) | 0.0267 (7) | 0.0017 (5) | 0.0156 (6) | 0.0007 (5) |
O17 | 0.0169 (4) | 0.0129 (4) | 0.0131 (4) | −0.0005 (3) | 0.0046 (3) | 0.0000 (3) |
C18 | 0.0218 (6) | 0.0190 (6) | 0.0142 (6) | 0.0007 (5) | 0.0035 (5) | −0.0003 (4) |
C19 | 0.0296 (8) | 0.0202 (6) | 0.0237 (7) | −0.0023 (5) | 0.0068 (6) | −0.0047 (5) |
C20 | 0.0261 (8) | 0.0328 (8) | 0.0306 (8) | −0.0005 (6) | 0.0059 (6) | −0.0149 (6) |
O21 | 0.0188 (4) | 0.0126 (4) | 0.0208 (4) | 0.0013 (3) | 0.0127 (4) | −0.0002 (3) |
C22 | 0.0197 (6) | 0.0185 (6) | 0.0220 (6) | 0.0025 (5) | 0.0134 (5) | −0.0003 (5) |
C23 | 0.0223 (7) | 0.0215 (6) | 0.0300 (7) | 0.0024 (5) | 0.0122 (6) | −0.0073 (5) |
C24 | 0.0253 (7) | 0.0352 (8) | 0.0327 (8) | 0.0104 (6) | 0.0126 (6) | −0.0073 (6) |
Cl25 | 0.0615 (3) | 0.01859 (16) | 0.02742 (19) | 0.01114 (16) | 0.01501 (19) | 0.00475 (13) |
Cl26 | 0.0690 (3) | 0.02000 (17) | 0.0518 (3) | −0.01600 (18) | 0.0438 (3) | −0.00762 (16) |
C1—C12i | 1.5220 (17) | C14—O17 | 1.3837 (15) |
C1—C2 | 1.5214 (18) | C15—Cl25 | 1.7998 (15) |
C1—H11 | 0.973 | C15—H151 | 0.950 |
C1—H12 | 0.998 | C15—H152 | 0.958 |
C2—C3 | 1.3956 (17) | C16—Cl26 | 1.8037 (15) |
C2—C14 | 1.3994 (17) | C16—H162 | 0.958 |
C3—C4 | 1.3927 (18) | C16—H161 | 0.957 |
C3—H31 | 0.962 | O17—C18 | 1.4392 (15) |
C4—C5 | 1.3940 (18) | C18—C19 | 1.503 (2) |
C4—C15 | 1.4959 (19) | C18—H181 | 0.988 |
C5—C6 | 1.3922 (17) | C18—H182 | 0.970 |
C5—H51 | 0.967 | C19—C20 | 1.521 (2) |
C6—C7 | 1.5203 (18) | C19—H192 | 0.984 |
C6—C14 | 1.4018 (18) | C19—H191 | 1.000 |
C7—C8 | 1.5190 (17) | C20—H201 | 0.967 |
C7—H72 | 0.985 | C20—H203 | 0.974 |
C7—H71 | 0.982 | C20—H202 | 0.969 |
C8—C9 | 1.3933 (17) | O21—C22 | 1.4420 (16) |
C8—C13 | 1.4016 (17) | C22—C23 | 1.5094 (19) |
C9—C10 | 1.3938 (18) | C22—H221 | 0.971 |
C9—H91 | 0.927 | C22—H222 | 0.969 |
C10—C11 | 1.3946 (18) | C23—C24 | 1.521 (2) |
C10—C16 | 1.4929 (18) | C23—H231 | 0.966 |
C11—C12 | 1.3950 (17) | C23—H232 | 0.961 |
C11—H111 | 0.941 | C24—H242 | 0.965 |
C12—C13 | 1.4024 (17) | C24—H241 | 0.952 |
C13—O21 | 1.3810 (14) | C24—H243 | 0.968 |
C12i—C1—C2 | 108.63 (10) | C4—C15—H151 | 110.3 |
C12i—C1—H11 | 109.8 | Cl25—C15—H151 | 106.3 |
C2—C1—H11 | 110.8 | C4—C15—H152 | 109.9 |
C12i—C1—H12 | 110.2 | Cl25—C15—H152 | 108.1 |
C2—C1—H12 | 110.4 | H151—C15—H152 | 108.5 |
H11—C1—H12 | 107.0 | C10—C16—Cl26 | 112.72 (10) |
C1—C2—C3 | 121.19 (11) | C10—C16—H162 | 108.1 |
C1—C2—C14 | 120.36 (11) | Cl26—C16—H162 | 106.6 |
C3—C2—C14 | 118.00 (12) | C10—C16—H161 | 111.8 |
C2—C3—C4 | 121.13 (12) | Cl26—C16—H161 | 105.1 |
C2—C3—H31 | 118.1 | H162—C16—H161 | 112.5 |
C4—C3—H31 | 120.7 | C14—O17—C18 | 112.95 (9) |
C3—C4—C5 | 119.59 (12) | O17—C18—C19 | 108.92 (11) |
C3—C4—C15 | 120.30 (12) | O17—C18—H181 | 107.9 |
C5—C4—C15 | 119.87 (12) | C19—C18—H181 | 111.8 |
C4—C5—C6 | 120.90 (12) | O17—C18—H182 | 111.4 |
C4—C5—H51 | 118.7 | C19—C18—H182 | 108.7 |
C6—C5—H51 | 120.3 | H181—C18—H182 | 108.1 |
C5—C6—C7 | 121.09 (12) | C18—C19—C20 | 111.62 (13) |
C5—C6—C14 | 118.31 (12) | C18—C19—H192 | 109.3 |
C7—C6—C14 | 120.23 (11) | C20—C19—H192 | 108.3 |
C6—C7—C8 | 109.38 (10) | C18—C19—H191 | 108.8 |
C6—C7—H72 | 110.6 | C20—C19—H191 | 108.6 |
C8—C7—H72 | 111.6 | H192—C19—H191 | 110.1 |
C6—C7—H71 | 108.8 | C19—C20—H201 | 109.7 |
C8—C7—H71 | 108.4 | C19—C20—H203 | 110.9 |
H72—C7—H71 | 108.0 | H201—C20—H203 | 107.8 |
C7—C8—C9 | 121.12 (11) | C19—C20—H202 | 109.9 |
C7—C8—C13 | 120.51 (11) | H201—C20—H202 | 110.0 |
C9—C8—C13 | 118.09 (11) | H203—C20—H202 | 108.5 |
C8—C9—C10 | 121.15 (12) | C13—O21—C22 | 113.71 (10) |
C8—C9—H91 | 118.5 | O21—C22—C23 | 107.23 (11) |
C10—C9—H91 | 120.3 | O21—C22—H221 | 110.3 |
C9—C10—C11 | 119.54 (11) | C23—C22—H221 | 111.5 |
C9—C10—C16 | 119.84 (12) | O21—C22—H222 | 108.5 |
C11—C10—C16 | 120.49 (12) | C23—C22—H222 | 108.5 |
C10—C11—C12 | 121.02 (12) | H221—C22—H222 | 110.7 |
C10—C11—H111 | 118.6 | C22—C23—C24 | 112.83 (13) |
C12—C11—H111 | 120.4 | C22—C23—H231 | 106.9 |
C1i—C12—C11 | 121.15 (11) | C24—C23—H231 | 109.0 |
C1i—C12—C13 | 120.33 (11) | C22—C23—H232 | 108.9 |
C11—C12—C13 | 118.09 (11) | C24—C23—H232 | 109.3 |
C12—C13—C8 | 121.91 (11) | H231—C23—H232 | 109.8 |
C12—C13—O21 | 118.79 (11) | C23—C24—H242 | 111.2 |
C8—C13—O21 | 119.11 (11) | C23—C24—H241 | 110.1 |
C6—C14—C2 | 121.86 (11) | H242—C24—H241 | 111.5 |
C6—C14—O17 | 118.64 (11) | C23—C24—H243 | 109.5 |
C2—C14—O17 | 119.34 (11) | H242—C24—H243 | 108.6 |
C4—C15—Cl25 | 113.61 (10) | H241—C24—H243 | 105.7 |
Symmetry code: (i) −x+1, y, −z+3/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C22—H222···Cl25ii | 0.97 | 2.90 | 3.786 (1) | 153 |
C23—H231···Cl26iii | 0.97 | 2.90 | 3.557 (2) | 127 |
Symmetry codes: (ii) x, −y, z−1/2; (iii) x, y−1, z. |
Experimental details
Crystal data | |
Chemical formula | C44H52Cl4O4 |
Mr | 786.66 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 100 |
a, b, c (Å) | 23.104 (3), 11.5871 (15), 17.618 (2) |
β (°) | 117.655 (2) |
V (Å3) | 4177.7 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.32 |
Crystal size (mm) | 0.49 × 0.31 × 0.15 |
Data collection | |
Diffractometer | Bruker Kappa APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.658, 0.746 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15796, 6176, 5280 |
Rint | 0.019 |
(sin θ/λ)max (Å−1) | 0.731 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.045, 0.119, 0.97 |
No. of reflections | 6176 |
No. of parameters | 235 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.84, −1.05 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SIR97 (Altomare et al., 1999), ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006), CRYSTALS (Betteridge et al., 2003), enCIFer (Allen et al., 2004) and publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
C22—H222···Cl25i | 0.97 | 2.90 | 3.786 (1) | 153 |
C23—H231···Cl26ii | 0.97 | 2.90 | 3.557 (2) | 127 |
Symmetry codes: (i) x, −y, z−1/2; (ii) x, y−1, z. |
Acknowledgements
We are grateful to Dr C. M. L. Vande Velde (Karel de Grote University College, Antwerp, Belgium) and Dr D. Watkin (University of Oxford) for helpful discussions. MHD is grateful to BFK NaWi, University of Bremen, for financial support. The X-ray diffractometer was funded by NSF grant 0087210, Ohio Board of Regents grant CAP-491 and Youngstown State University.
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Calixarenes, a family of macrocyclic compounds, have shown to be superb molecular scaffolds for the construction of macromolecular and supramolecular architectures (Gutsche, 2008; Ikeda & Shinkai, 1997). Calix[4]arenes can adopt several conformations, of which the cone conformation is the most commonly employed one. Due to their bowl shape and ease of preparation, they are employed widely in supramolecular chemistry and crystal engineering (Dalgrano et al., 2007) for preparation of species and materials suitable for molecular encapsulation. The 1,3–alternate conformation of calix[4]arenes is much less commonly used. The title compound and its derivatives were previously synthesized (Ikeda & Shinkai, 1994a) to study binding of metal cations in solution, as well as for preparation of calixarene–based nanotubes (Ikeda & Shinkai, 1994b).
The molecule of the title compound is shown in Fig. 1. The calix[4]arene bowl adopts the 1,3–alternate conformation around a twofold symmetry axis; for that reason, the IUPAC numbering scheme for calix[4]arenes could not be applied. All bond lengths and angles may be considered normal. Four phenolic rings are pitched into the calix cavity, as defined by the angles, which the aromatic rings make with the plane of the four bridging methylenes (C1–C7–C1i–C7i): 77.42 (2)° (ring C2–6, C14) and 77.71 (2)° (ring C8–13), respectively (symmetry code: (i) -x+1, y, -z+3/2). Two pairs of opposite aromatic rings show interplanar angles of 25.16 (3)° (ring C2–6, C14) and 24.58 (4)° (ring C8–13), respectively. Four propyl chains point outside the cavity and adopt an anti conformation for all their bonds. Four chlorine atoms are also pointing outside from the calix cavity.
Several non–classical intermolecular weak hydrogen bonds are present in the structure (Desiraju & Steiner, 1999; Steiner, 2002; Desiraju, 2005). Details of the packing interactions are given in Table 1. Molecules pack into infinite columns along the b axis. Two short C23–H231···Cl26iii (symmetry code: (iii) x, y-1, z) contacts (2.90Å), parallel to the b axis, link molecules with each other (Fig. 2). Along the c axis, the molecules are interconnected side–to–side through pairs of C22–H222···Cl25ii (symmetry code: (ii) x, -y, z - 1/2) interactions (2.90Å, Fig. 3). In both cases, hydrogen atoms of the C22–24 propyl chains serve as H–bond donors. When viewed along the b axis, calixarene backbones form infinite channels with a shortest distance of 8.8090 (13)Å between the two neighboring channel centers (Fig. 2).