Symmetry and polar-π effects on the dynamics of enshrouded aryl-alkyne molecular rotors
Karim, Arif R.; Linden, Anthony; Baldridge, Kim K.; Siegel, Jay S.; Chemical Science 1 (2010) 102–; doi:10.1039/c0sc00117a

data_1515860
_publ_section_title
;
 Symmetry and polar-\p effects on the dynamics of enshrouded aryl-alkyne
 molecular rotors
;
_journal_issue                   1
_journal_name_full               'Chemical Science'
_journal_page_first              102
_journal_paper_doi               10.1039/c0sc00117a
_journal_volume                  1
_journal_year                    2010
_chemical_formula_moiety         'C52 H50 O4'
_chemical_formula_sum            'C52 H50 O4'
_chemical_formula_weight         738.96
_space_group_IT_number           7
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      7
_symmetry_space_group_name_Hall  'P -2yc'
_symmetry_space_group_name_H-M   'P 1 c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             06-01-16
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 114.5753(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.9195(3)
_cell_length_b                   26.1804(7)
_cell_length_c                   13.8321(3)
_cell_measurement_reflns_used    7705
_cell_measurement_temperature    160(1)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      2.0
_cell_volume                     4254.73(18)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 2000)'
_computing_data_reduction
'DENZO-SMN and SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  'SHELXL97 and PLATON (Spek, 2005)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      160(1)
_diffrn_detector                 '65 mm CCD camera on \k goniostat'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Nonius KappaCCD area-detector diffractometer'
_diffrn_measurement_method       '\f and \w scans with \k offsets'
_diffrn_radiation_monochromator  'horizontally mounted graphite crystal'
_diffrn_radiation_source         'Nonius FR590 sealed tube generator'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0840
_diffrn_reflns_av_sigmaI/netI    0.0662
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            65817
_diffrn_reflns_theta_full        25.04
_diffrn_reflns_theta_max         25.04
_diffrn_reflns_theta_min         2.33
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.0713
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.154
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1576
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.186
_refine_diff_density_min         -0.189
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details 'Flack (1983)'
_refine_ls_abs_structure_Flack   -0.4(12)
_refine_ls_extinction_coef       0.0215(9)
_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   1.091
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1034
_refine_ls_number_reflns         7532
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.091
_refine_ls_R_factor_all          0.0911
_refine_ls_R_factor_gt           0.0526
_refine_ls_shift/su_max          0.050
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0555P)^2^+0.0332P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0998
_refine_ls_wR_factor_ref         0.1166
_reflns_number_gt                5363
_reflns_number_total             7536
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c0sc00117a.txt
_cod_data_source_block           SG0601
_cod_database_code               1515860