Switching from positive to negative thermal expansion in a tetrayne-diol compound
Sethi, Tapaswini; Das, Dinabandhu; CrystEngComm 26 (2024) 5133–5137; doi:10.1039/D4CE00703D

data_7249267
_publ_section_title
;
 Switching from positive to negative thermal expansion in a tetrayne-diol
 compound
;
_journal_issue                   37
_journal_name_full               CrystEngComm
_journal_page_first              5133
_journal_page_last               5137
_journal_paper_doi               10.1039/D4CE00703D
_journal_volume                  26
_journal_year                    2024
_chemical_formula_moiety         'C18 H18 O2'
_chemical_formula_sum            'C18 H18 O2'
_chemical_formula_weight         266.32
_chemical_name_systematic
1,1?-(octa-1,3,5,7-tetrayne-1,8-diyl)dicyclopentanol
_space_group_crystal_system      orthorhombic
_space_group_IT_number           41
_space_group_name_Hall           'A 2 -2ab'
_space_group_name_H-M_alt        'A e a 2'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2019/3
_audit_update_record
;
2024-07-03 deposited with the CCDC.	2024-09-02 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   19.6354(11)
_cell_length_b                   18.9619(10)
_cell_length_c                   8.3324(4)
_cell_measurement_reflns_used    9979
_cell_measurement_temperature    250(2)
_cell_measurement_theta_max      25.77
_cell_measurement_theta_min      2.39
_cell_volume                     3102.4(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX3'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Xseed-2020 (Barbour, 2020)'
_computing_structure_refinement  'SHELXL-2019/2 (Sheldrick, 2019)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      250(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker APEX-III Photon-II detector'
_diffrn_measurement_method       'phi and omega scan'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0455
_diffrn_reflns_av_unetI/netI     0.0254
_diffrn_reflns_Laue_measured_fraction_full 0.993
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            33380
_diffrn_reflns_point_group_measured_fraction_full 0.973
_diffrn_reflns_point_group_measured_fraction_max 0.952
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         28.340
_diffrn_reflns_theta_min         2.865
_diffrn_source                   microfocus
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6796
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.140
_exptl_crystal_density_meas      ?
_exptl_crystal_description       Plate
_exptl_crystal_F_000             1136
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: mixture of ethyl acetate and chloroform'
_exptl_crystal_size_max          0.318
_exptl_crystal_size_mid          0.154
_exptl_crystal_size_min          0.140
_refine_diff_density_max         0.307
_refine_diff_density_min         -0.201
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details
;
 Flack x determined using 1215 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.8(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     189
_refine_ls_number_reflns         3695
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0593
_refine_ls_R_factor_gt           0.0469
_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^)+(0.0695P)^2^+1.3965P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1240
_refine_ls_wR_factor_ref         0.1359
_reflns_Friedel_coverage         0.792
_reflns_Friedel_fraction_full    0.949
_reflns_Friedel_fraction_max     0.904
_reflns_number_gt                3139
_reflns_number_total             3695
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d4ce00703d2.cif
_cod_data_source_block           250K
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_crystal_density_meas' value 'not measured' was
changed to '?' -- the value is perceived as not measured.

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

 Adding full bibliography for 7249264--7249269.cif.
;
_cod_original_sg_symbol_Hall     'A 2 -2ac'
_cod_original_sg_symbol_H-M      'A b a 2'
_cod_database_code               7249267
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_min   0.977
_shelx_estimated_absorpt_t_max   0.990
_shelx_res_checksum              56552
_shelx_hkl_checksum              1897