Nearly Isostructural Polymorphs of Ethynylbenzene: Resolution of \τbCH...π(arene) and Cooperative \τbCH...π(C\τbC) Interactions by Pressure Freezing
Kamil Dziubek; Marcin Podsiadło; Andrzej Katrusiak; Journal of the American Chemical Society 129 (2007) 12620–12621; doi:10.1021/ja074885r

data_4110049
_publ_contact_author_fax         +48(61)8658008
_publ_contact_author_phone       +48(61)8291443
_publ_section_title
;
 Nearly Isostructural Polymorphs of Ethynylbenzene: Resolution of
 \\tbCH...\p(arene) and Cooperative \\tbCH...\p(C\\tbC) Interactions by
 Pressure Freezing
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12620
_journal_page_last               12621
_journal_paper_doi               10.1021/ja074885r
_journal_volume                  129
_journal_year                    2007
_chemical_formula_moiety         'C8 H6'
_chemical_formula_sum            'C8 H6'
_chemical_formula_weight         102.13
_chemical_melting_point          228
_chemical_name_common            'phenylacetylene, polymorph alpha at 225 K'
_chemical_name_systematic
; 
Ethynylbenzene, polymorph alpha at 225 K
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                76.81(3)
_cell_angle_beta                 81.68(3)
_cell_angle_gamma                80.32(3)
_cell_formula_units_Z            5
_cell_length_a                   5.8630(12)
_cell_length_b                   9.1863(18)
_cell_length_c                   15.474(3)
_cell_measurement_reflns_used    460
_cell_measurement_temperature    225(2)
_cell_measurement_theta_max      29.29
_cell_measurement_theta_min      2.41
_cell_volume                     795.0(3)
_computing_cell_refinement       'CrysAlis (Oxford Diffraction, 2004)'
_computing_data_collection       'CrysAlis (Oxford Diffraction, 2004)'
_computing_data_reduction        'CrysAlis (Oxford Diffraction, 2004)'
_computing_molecular_graphics    'XP (Siemens, 1990)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.698
_diffrn_measured_fraction_theta_max 0.698
_diffrn_measurement_device_type  'Kuma KM-4-CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1599
_diffrn_reflns_av_sigmaI/netI    0.3351
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            4147
_diffrn_reflns_theta_full        29.29
_diffrn_reflns_theta_max         29.29
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    0.060
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.067
_exptl_crystal_description       cylinder
_exptl_crystal_F_000             270
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.190
_refine_diff_density_min         -0.259
_refine_diff_density_rms         0.057
_refine_ls_extinction_coef       0.063(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.784
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     109
_refine_ls_number_reflns         3020
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.784
_refine_ls_R_factor_all          0.3585
_refine_ls_R_factor_gt           0.0800
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1159P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1772
_refine_ls_wR_factor_ref         0.3331
_reflns_number_gt                487
_reflns_number_total             3020
_reflns_threshold_expression     >4sigma(I)
_cod_data_source_file            ja074885rsi20070703_084913.cif
_cod_data_source_block           1pha_nis
_cod_database_code               4110049