Building Strain with Large Macrocycles and Using It To Tune the Thermal Half-Lives of Hydrazone Photochromes.
Li, Quan; Qian, Hai; Shao, Baihao; Hughes, Russell P.; Aprahamian, Ivan; Journal of the American Chemical Society 140 (2018) 11829–11835; doi:10.1021/jacs.8b07612

data_4132957
_publ_section_title
;
 Building Strain with Large Macrocycles and Using It To Tune the Thermal
 Half-Lives of Hydrazone Photochromes.
;
_journal_issue                   37
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11829
_journal_page_last               11835
_journal_paper_doi               10.1021/jacs.8b07612
_journal_volume                  140
_journal_year                    2018
_chemical_formula_moiety         'C18 H16 N2 O4'
_chemical_formula_sum            'C18 H16 N2 O4'
_chemical_formula_weight         324.33
_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             2017-05-19
_audit_creation_method
;
Olex2 1.2-alpha
(compiled 2017.03.28 svn.r3405 for OlexSys, GUI svn.r5337)
;
_cell_angle_alpha                90
_cell_angle_beta                 90.1220(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.5136(8)
_cell_length_b                   10.2478(10)
_cell_length_c                   17.2085(17)
_cell_measurement_reflns_used    4660
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.38
_cell_measurement_theta_min      2.37
_cell_volume                     1501.4(3)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_collection       'COSMO (BRUKER, V1.61, 2009)'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 8.36
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0337
_diffrn_reflns_av_unetI/netI     0.0284
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            11830
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.395
_diffrn_reflns_theta_min         2.313
_diffrn_source                   'sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.6927
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2014/5 (Bruker,2014/5) was used for absorption correction. wR2(int) was 0.0529 before and 0.0484 after correction. The Ratio of minimum to maximum transmission is 0.9295. The \l/2 correction factor is 0.00150.'
_exptl_crystal_colour            yellow
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.435
_exptl_crystal_description       needle
_exptl_crystal_F_000             680
_exptl_crystal_recrystallization_method 'used as received'
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.172
_exptl_crystal_size_min          0.036
_refine_diff_density_max         0.193
_refine_diff_density_min         -0.236
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     221
_refine_ls_number_reflns         2761
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0545
_refine_ls_R_factor_gt           0.0404
_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^)+(0.0622P)^2^+0.1955P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1019
_refine_ls_wR_factor_ref         0.1133
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2149
_reflns_number_total             2761
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b07612_si_004.cif
_cod_data_source_block           ia517c
_cod_database_code               4132957
_shelxl_version_number           2014/6
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
2.a Secondary CH2 refined with riding coordinates:
 C1(H1A,H1B), C2(H2A,H2B), C3(H3A,H3B)
2.b Aromatic/amide H refined with riding coordinates:
 C7(H7), C8(H8), C9(H9), C10(H10), C11(H11), C15(H15), C16(H16), C17(H17),
 C18(H18)
;
_olex2_diffrn_ambient_temperature_device 'Oxford Cryosystems'
_olex2_exptl_crystal_mounting_method
'The crystal was mounted on a nylon loop with paratone oil'
_olex2_submission_original_sample_id 'C3 Lq-286'
_olex2_submission_special_instructions 'No special instructions were received'