The impact of solid solution composition on kinetics and mechanism of [2 + 2] photodimerization of cinnamic acid derivatives
Pandolfi, Lorenzo; Giunchi, Andrea; Salzillo, Tommaso; Brillante, Aldo; Della Valle, Raffaele G.; Venuti, Elisabetta; Grepioni, Fabrizia; D'Agostino, Simone; CrystEngComm 23 (2021) 1352–1359; doi:10.1039/D0CE01718C

data_7241984
_publ_section_title
;
 The impact of solid solution composition on kinetics and mechanism of [2
 + 2] photodimerization of cinnamic acid derivatives
;
_journal_issue                   6
_journal_name_full               CrystEngComm
_journal_page_first              1352
_journal_page_last               1359
_journal_paper_doi               10.1039/D0CE01718C
_journal_volume                  23
_journal_year                    2021
_chemical_formula_moiety         'Br Cl, C18 H20 N2 O4'
_chemical_formula_sum            'C18 H20 Br Cl N2 O4'
_chemical_formula_weight         443.72
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2020-05-05
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2020-10-16 deposited with the CCDC.	2020-12-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 91.628(7)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.9100(4)
_cell_length_b                   8.6120(10)
_cell_length_c                   18.0253(16)
_cell_measurement_reflns_used    966
_cell_measurement_temperature    300
_cell_measurement_theta_max      25.7160
_cell_measurement_theta_min      4.0540
_cell_volume                     917.06(15)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      300
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.829
_diffrn_measurement_device_type  'Xcalibur, Sapphire3'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0295
_diffrn_reflns_av_unetI/netI     0.0620
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.829
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            4168
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.829
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         29.464
_diffrn_reflns_theta_min         3.449
_exptl_absorpt_coefficient_mu    2.414
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.52121
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.40.69a (Rigaku Oxford Diffraction, 2020)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear light yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.607
_exptl_crystal_description       block
_exptl_crystal_F_000             452
_exptl_crystal_preparation
'neutralization reaction mixing and partial irradiation'
_exptl_crystal_recrystallization_method 'slow evaporation'
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.355
_refine_diff_density_min         -0.313
_refine_diff_density_rms         0.065
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.153
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         2116
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.153
_refine_ls_R_factor_all          0.1183
_refine_ls_R_factor_gt           0.0692
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0391P)^2^+0.4542P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1168
_refine_ls_wR_factor_ref         0.1339
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1390
_reflns_number_total             2116
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ce01718c2.cif
_cod_data_source_block           '[12H2]BrCl'
_cod_depositor_comments
'Adding full bibliography for 7241976--7241984.cif.'
_cod_database_code               7241984
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.931
_shelx_estimated_absorpt_t_min   0.830
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All N(H,H,H) groups
 At 1.5 times of:
  All O(H) groups
2. Others
 Fixed Sof: Cl1(0.5) Br1(0.5)
3.a Ternary CH refined with riding coordinates:
 C8(H8), C7(H7)
3.b Aromatic/amide H refined with riding coordinates:
 C2(H2A), C3(H3), C5(H5), C6(H6)
3.c Idealised Me refined as rotating group:
 N1(H1A,H1B,H1C)
3.d Idealised tetrahedral OH refined as rotating group:
 O2(H2)
;
_shelx_res_checksum              1091
_olex2_exptl_crystal_mounting_method 'fomblin oil'
_olex2_submission_special_instructions 'No special instructions were received'