X-ray Diffraction Analysis of Nonequilibrium States in Crystals: Observation of an Unstable Conformer in Flash-Cooled Crystals
Jun Harada; Keiichiro Ogawa; Journal of the American Chemical Society 126 (2004) 3539–3544; doi:10.1021/ja038203l

data_4112346
_publ_section_title
;
 X-ray Diffraction Analysis of Nonequilibrium States in Crystals:
 Observation of an Unstable Conformer in Flash-Cooled Crystals
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3539
_journal_page_last               3544
_journal_paper_doi               10.1021/ja038203l
_journal_volume                  126
_journal_year                    2004
_chemical_formula_sum            'C12 H10 N2'
_chemical_formula_weight         182.22
_chemical_melting_point          341
_chemical_name_common            azobenzene
_chemical_name_systematic
; 
(E)-1,2-diphenyldiazene 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yab'
_symmetry_space_group_name_H-M   'P 1 21/a 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   geom
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 112.4580(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.1387(6)
_cell_length_b                   5.7622(3)
_cell_length_c                   15.1592(8)
_cell_measurement_reflns_used    6604
_cell_measurement_temperature    250
_cell_measurement_theta_max      27.4
_cell_measurement_theta_min      2.7
_cell_volume                     979.90(9)
_computing_cell_refinement       'SAINT (Bruker, 1998)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1997)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      250
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD diffractometer'
_diffrn_measurement_method       \w_scan
_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  0.0121
_diffrn_reflns_av_sigmaI/netI    0.0085
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            12167
_diffrn_reflns_theta_full        27.51
_diffrn_reflns_theta_max         27.51
_diffrn_reflns_theta_min         2.91
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  0.987943
_exptl_absorpt_correction_T_min  0.863761
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.235
_exptl_crystal_description       block
_exptl_crystal_F_000             384
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.250
_refine_diff_density_min         -0.191
_refine_diff_density_rms         0.032
_refine_ls_extinction_coef       0.125(8)
_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    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     146
_refine_ls_number_reflns         2251
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.101
_refine_ls_R_factor_all          0.0446
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0540P)^2^+0.2034P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1104
_refine_ls_wR_factor_ref         0.1145
_reflns_number_gt                1945
_reflns_number_total             2251
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja038203lsi20030829_041420.cif
_cod_data_source_block           azo250k
_cod_database_code               4112346