Proton Grease: An Acid Accelerated Molecular Rotor
Brent E. Dial; Perry J. Pellechia; Mark D. Smith; Ken D. Shimizu; Journal of the American Chemical Society 134 (2012) 3675–3678; doi:10.1021/ja2120184

data_4117565
_publ_section_title
;
 Proton Grease: An Acid Accelerated Molecular Rotor
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3675
_journal_page_last               3678
_journal_paper_doi               10.1021/ja2120184
_journal_volume                  134
_journal_year                    2012
_chemical_formula_moiety         'C13 H11 N2 O2, C13 H10 N2 O2, H2 O, Cl'
_chemical_formula_sum            'C26 H23 Cl N4 O5'
_chemical_formula_weight         506.93
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.3527(8)
_cell_length_b                   7.6789(4)
_cell_length_c                   16.5549(8)
_cell_measurement_reflns_used    5108
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      24.498
_cell_measurement_theta_min      2.460
_cell_volume                     2333.06(19)
_computing_cell_refinement       'SAINT-Plus Version 6.45 (Bruker, 2001)'
_computing_data_collection       'SMART Version 5.625 (Bruker, 2001)'
_computing_data_reduction        'SAINT-Plus Version 6.45 (Bruker, 2001)'
_computing_molecular_graphics    various
_computing_publication_material  'SHELXTL Version 6.14 (Bruker, 2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART APEX CCD diffractometer'
_diffrn_measurement_method       'omega scans'
_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  0.0622
_diffrn_reflns_av_sigmaI/netI    0.0416
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            28587
_diffrn_reflns_theta_full        26.41
_diffrn_reflns_theta_max         26.41
_diffrn_reflns_theta_min         2.22
_exptl_absorpt_coefficient_mu    0.211
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8926
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS Version 2.05 (Bruker, 2001)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.443
_exptl_crystal_description       plate
_exptl_crystal_F_000             1056
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.308
_refine_diff_density_min         -0.178
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.37(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     338
_refine_ls_number_reflns         4779
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0527
_refine_ls_R_factor_gt           0.0424
_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^)+(0.0517P)^2^+0.0367P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0912
_refine_ls_wR_factor_ref         0.0962
_reflns_number_gt                4140
_reflns_number_total             4779
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja2120184_si_003.cif
_cod_data_source_block           bd75ass
_cod_database_code               4117565