Light-Driven Molecular Motors: Stepwise Thermal Helix Inversion during Unidirectional Rotation of Sterically Overcrowded Biphenanthrylidenes
Matthijs K. J. ter Wiel; Richard A. van Delden; Auke Meetsma; Ben L. Feringa; Journal of the American Chemical Society 127 (2005) 14208–14222; doi:10.1021/ja052201e

data_4111985
_publ_contact_author_address
;
     Crystal Structure Center,
     Inorganic Solid State Chemistry Laboratory
     Chemical Physics,
     Materials Science Center,
     Groningen University,
     Nijenborgh 4,
     NL-9747 AG Groningen,
     The Netherlands.
;
_publ_contact_author_email       A.Meetsma@rug.nl
_publ_contact_author_fax         '+31 50 3634441'
_publ_contact_author_name
;
   Drs. A. Meetsma
;
_publ_contact_author_phone       '+31 50 3634368'
_publ_section_title
;
 Light-Driven Molecular Motors: Stepwise Thermal Helix Inversion during
 Unidirectional Rotation of Sterically Overcrowded Biphenanthrylidenes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14208
_journal_page_last               14222
_journal_paper_doi               10.1021/ja052201e
_journal_volume                  127
_journal_year                    2005
_chemical_compound_source        'see text'
_chemical_formula_moiety         'C36 H40'
_chemical_formula_sum            'C36 H40'
_chemical_formula_weight         472.68
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           13
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ya'
_symmetry_space_group_name_H-M   'P 1 2/a 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     heavy
_atom_sites_solution_secondary   direct
_audit_creation_date             '2001-07-09  15:35:34'
_audit_creation_method           'PLATON <TABLE ACC> option'
_cell_angle_alpha                90
_cell_angle_beta                 113.698(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   18.161(2)
_cell_length_b                   7.3428(7)
_cell_length_c                   22.132(2)
_cell_measurement_reflns_used    3477
_cell_measurement_temperature    110
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      2.47
_cell_volume                     2702.5(5)
_computing_cell_refinement       'SAINT, Bruker Version 6.02A, 2000'
_computing_data_collection       'SMART, Bruker Version 5.168, 2000'
_computing_data_reduction        'XPREP, Bruker Version 5.1/NT, 2000'
_computing_molecular_graphics
;
 PLUTO (Meetsma, 2001) 
 PLATON (Spek, 1994)
;
_computing_publication_material
;
 PLATON (Spek, 1990)
 SHELXL (Sheldrick, 1997)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution
;
 SHELXS-97 (Sheldrick, 1997)
 SHELXTL (Sheldrick, 2000)
;
_diffrn_ambient_temperature      110(2)
_diffrn_detector_area_resol_mean '4096x4096 / 62x62 (binned 512)'
_diffrn_measured_fraction_theta_full 0.916
_diffrn_measured_fraction_theta_max 0.916
_diffrn_measurement_device_type
;
  Bruker Smart Apex 
;
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_detector
;
  CCD area-detector
;
_diffrn_radiation_monochromator  'parallel mounted graphite'
_diffrn_radiation_source         'fine focus sealed Siemens Mo tube '
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0397
_diffrn_reflns_av_sigmaI/netI    0.0536
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            12322
_diffrn_reflns_reduction_process
;
 Intensity data were corrected for Lorentz and polarization
  effects, decay and absorption and reduced to F~o~^2^
  using SAINT (Bruker, 2000) and SADABS (Sheldrick, 2001)
;
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.47
_exptl_absorpt_coefficient_mu    0.065
_exptl_absorpt_correction_T_max  0.9974
_exptl_absorpt_correction_T_min  0.9745
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS, Sheldrick, Bruker, 2000))'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.162
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1024
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.224
_refine_diff_density_min         -0.219
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     489
_refine_ls_number_reflns         4755
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.040
_refine_ls_R_factor_all          0.0865
_refine_ls_R_factor_gt           0.0507
_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^)+(0.0545P)^2^+0.6741P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1119
_refine_ls_wR_factor_ref         0.1278
_reflns_number_gt                3136
_reflns_number_total             4755
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja052201esi20050722_120723.cif
_cod_data_source_block           c36h40
_cod_original_sg_symbol_H-M      'P 2/a'
_cod_database_code               4111985