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_7241976
_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         'C9 H10 N O2, Br0.25 Cl0.75'
_chemical_formula_sum            'C9 H10 Br0.25 Cl0.75 N O2'
_chemical_formula_weight         210.74
_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   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2020-10-19
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2020-10-19 deposited with the CCDC.	2020-12-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 92.189(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.6333(2)
_cell_length_b                   8.5840(4)
_cell_length_c                   19.6694(9)
_cell_measurement_reflns_used    1348
_cell_measurement_temperature    300
_cell_measurement_theta_max      27.3110
_cell_measurement_theta_min      4.0880
_cell_volume                     950.44(7)
_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_detector_type            Sapphire3
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.857
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0253
_diffrn_reflns_av_unetI/netI     0.0449
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.857
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            4072
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.857
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         29.115
_diffrn_reflns_theta_min         3.619
_exptl_absorpt_coefficient_mu    1.348
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.93700
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.46 (Rigaku Oxford Diffraction, 2015)
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    1.473
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             434
_exptl_crystal_preparation       'slow evaporation'
_exptl_crystal_size_max          0.07
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.362
_refine_diff_density_min         -0.318
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.068
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         2191
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0783
_refine_ls_R_factor_gt           0.0524
_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^)+(0.0608P)^2^+0.2719P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1245
_refine_ls_wR_factor_ref         0.1396
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1595
_reflns_number_total             2191
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ce01718c2.cif
_cod_data_source_block           '[1H]Br025Cl075'
_cod_depositor_comments
'Adding full bibliography for 7241976--7241984.cif.'
_cod_database_code               7241976
_shelx_shelxl_version_number     2016/6
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
2. Restrained distances
 O2-H2A
 1 with sigma of 0.02
3. Others
 Fixed Sof: Br1(0.25) Cl1(0.75)
 Fixed X: Br1(0.891281) Cl1(0.8906)
 Fixed Y: Br1(0.70089) Cl1(0.69933)
 Fixed Z: Br1(0.22323) Cl1(0.237049)
4.a Aromatic/amide H refined with riding coordinates:
 C2(H2), C6(H6), C3(H3), C5(H5), C7(H7), C8(H8)
;
_shelx_res_checksum              42661
_olex2_exptl_crystal_mounting_method 'fomblin oil'
_olex2_submission_special_instructions 'No special instructions were received'