Conformational preference in difluoroacetamide oligomers: probing the potential for foldamers with C-H⋯O hydrogen bonds.
Žabka, Matej; Clayden, Jonathan; Organic & biomolecular chemistry 21 (2023) 5939–5943; doi:10.1039/d3ob00811h

data_7159396
_publ_section_title
;
 Conformational preference in difluoroacetamide oligomers: probing the
 potential for foldamers with C-H&#x22ef;O hydrogen bonds.
;
_journal_issue                   29
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              5939
_journal_page_last               5943
_journal_paper_doi               10.1039/d3ob00811h
_journal_volume                  21
_journal_year                    2023
_chemical_formula_moiety         'C20 H20 F4 N2 O2, 2(C H Cl3)'
_chemical_formula_sum            'C22 H22 Cl6 F4 N2 O2'
_chemical_formula_weight         635.11
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2023-05-17
_audit_creation_method
;
Olex2 1.5
(compiled 2023.03.06 svn.rbb2c1857 for OlexSys, GUI svn.r6748)
;
_audit_update_record
;
2023-05-19 deposited with the CCDC.	2023-06-26 downloaded from the CCDC.
;
_cell_angle_alpha                66.9880(10)
_cell_angle_beta                 86.9530(10)
_cell_angle_gamma                87.6390(10)
_cell_formula_units_Z            1
_cell_length_a                   5.7583(2)
_cell_length_b                   10.0636(4)
_cell_length_c                   12.6561(5)
_cell_measurement_reflns_used    9927
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.916
_cell_measurement_theta_min      3.302
_cell_volume                     673.93(4)
_computing_cell_refinement       'SAINT v8.39.0 (Bruker, 2018)'
_computing_data_collection       'Bruker SC-XRD Suite'
_computing_data_reduction        'SAINT v8.39.0 (Bruker, 2018)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL  (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'Bruker PHOTON III C7'
_diffrn_detector_type            CPAD
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       'Bruker D8 Venture dual source kappa CPAD'
_diffrn_measurement_device_type  'Bruker D8 Venture'
_diffrn_measurement_method       '\f and \w-scan'
_diffrn_radiation_monochromator  'focusing mirrors'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0256
_diffrn_reflns_av_unetI/netI     0.0143
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            38662
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.952
_diffrn_reflns_theta_min         1.750
_diffrn_source                   'microfocus sealed X-ray tube'
_diffrn_source_current           1.4
_diffrn_source_power             0.07
_diffrn_source_type              'Incoatec I\uS microsource'
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.689
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6295
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0986 before and 0.0422 after correction.
The Ratio of minimum to maximum transmission is 0.8443.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.565
_exptl_crystal_description       block
_exptl_crystal_F_000             322
_exptl_crystal_size_max          0.344
_exptl_crystal_size_mid          0.323
_exptl_crystal_size_min          0.268
_refine_diff_density_max         0.505
_refine_diff_density_min         -0.536
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     163
_refine_ls_number_reflns         3236
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0330
_refine_ls_R_factor_gt           0.0300
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0252P)^2^+0.4852P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0676
_refine_ls_wR_factor_ref         0.0693
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3004
_reflns_number_total             3236
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3ob00811h2.cif
_cod_data_source_block           testt1
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_diffrn_radiation_probe' value 'X-ray' was changed to
'x-ray' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 8170 2020-07-09 18:12:32Z antanas 

 Adding full bibliography for 7159396.cif.
;
_cod_database_code               7159396
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.837
_shelx_estimated_absorpt_t_min   0.797
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
2.a Ternary CH refined with riding coordinates:
 C9(H9), C11(H11)
2.b Secondary CH2 refined with riding coordinates:
 C1(H1A,H1B), C10(H10A,H10B)
2.c Aromatic/amide H refined with riding coordinates:
 C3(H3), C4(H4), C5(H5), C6(H6), C7(H7)
;
_shelx_res_checksum              13959
_olex2_submission_special_instructions 'No special instructions were received'