The formation of peroxide degradation products of photochromic triphenylimidazolyl radical-dimers.
Edkins, Robert M.; Probert, Michael R.; Fucke, Katharina; Robertson, Craig M.; Howard, Judith A. K.; Beeby, Andrew; Physical chemistry chemical physics : PCCP 15 (2013) 7848–7853; doi:10.1039/c3cp50757b

data_7211289
_publ_section_title
;
 The formation of peroxide degradation products of photochromic
 triphenylimidazolyl radical-dimers.
;
_journal_issue                   20
_journal_name_full               'Physical chemistry chemical physics : PCCP'
_journal_page_first              7848
_journal_page_last               7853
_journal_paper_doi               10.1039/c3cp50757b
_journal_volume                  15
_journal_year                    2013
_chemical_formula_moiety         'C25 H24 N2'
_chemical_formula_sum            'C25 H24 N2'
_chemical_formula_weight         352.46
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_date             2012-03-26
_audit_creation_method
;
Olex2 1.2-alpha
(compiled 2012.03.09 svn.r2242, GUI svn.r4116)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 100.178(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   9.692(2)
_cell_length_b                   19.705(5)
_cell_length_c                   21.494(5)
_cell_measurement_reflns_used    5965
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      24.80
_cell_measurement_theta_min      2.34
_cell_volume                     4040.3(16)
_computing_cell_refinement       'Bruker APEX2'
_computing_data_collection       'Bruker SAINT'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement
;
SHELXL, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_computing_structure_solution
;
olex2.solve (L.J. Bourhis, O.V. Dolomanov, R.J. Gildea, J.A.K. Howard,
H. Puschmann, in preparation, 2011)
;
_diffrn_ambient_temperature      120.15
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.68890
_diffrn_reflns_av_R_equivalents  0.0859
_diffrn_reflns_av_unetI/netI     0.0801
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            31649
_diffrn_reflns_theta_full        24.21
_diffrn_reflns_theta_max         24.21
_diffrn_reflns_theta_min         1.37
_diffrn_source                   'I19 at Diamond'
_diffrn_source_current           90.0
_diffrn_source_power             4.5
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.068
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.8280
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.159
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1504
_exptl_crystal_size_max          0.03
_exptl_crystal_size_mid          0.01
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.232
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.001
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     501
_refine_ls_number_reflns         6990
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.001
_refine_ls_R_factor_all          0.0971
_refine_ls_R_factor_gt           0.0559
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0647P)^2^+1.4200P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1293
_refine_ls_wR_factor_ref         0.1471
_reflns_number_gt                4663
_reflns_number_total             6990
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3cp50757b.txt
_cod_data_source_block           2tbu
_cod_database_code               7211289