Unusual physical behaviour and polymorphic phase transitions in crystalline bicyclic anhydrides
Jezowski, Sebastian R.; Monaco, Stephen; Yennawar, Hemant P.; Wonderling, Nichole M.; Mathers, Robert T.; Schatschneider, Bohdan; CrystEngComm 19 (2017) 276–; doi:10.1039/C6CE02036D

data_7227191
_publ_section_title
;
 Unusual physical behaviour and polymorphic phase transitions in
 crystalline bicyclic anhydrides
;
_journal_issue                   2
_journal_name_full               CrystEngComm
_journal_page_first              276
_journal_paper_doi               10.1039/C6CE02036D
_journal_volume                  19
_journal_year                    2017
_chemical_formula_moiety         'C14 H20 O3'
_chemical_formula_sum            'C14 H20 O3'
_chemical_formula_weight         236.30
_chemical_melting_point          363
_chemical_name_systematic
5-methyl-8-(propan-2-yl)-3a,4,7,7a-tetrahydro-4,7-ethano-2-benzofuran-1,3-dione
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2016-08-16 deposited with the CCDC.
2016-11-28 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.9562(18)
_cell_length_b                   8.559(2)
_cell_length_c                   21.752(6)
_cell_measurement_reflns_used    2369
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      23.977
_cell_measurement_theta_min      2.554
_cell_volume                     1295.1(6)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 8.34
_diffrn_measured_fraction_theta_full 0.944
_diffrn_measured_fraction_theta_max 0.944
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0331
_diffrn_reflns_av_sigmaI/netI    0.0453
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            7213
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.87
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.9876
_exptl_absorpt_correction_T_min  0.9843
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.212
_exptl_crystal_description       cubical
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.134
_refine_diff_density_min         -0.182
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -4.0(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.012
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     157
_refine_ls_number_reflns         2952
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.012
_refine_ls_R_factor_all          0.0688
_refine_ls_R_factor_gt           0.0496
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.003
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0745P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1315
_refine_ls_wR_factor_ref         0.1413
_reflns_number_gt                2074
_reflns_number_total             2952
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ce02036d2.cif
_cod_data_source_block           rtm2s
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 

 Adding full bibliography for 7227190--7227193.cif.
;
_cod_original_cell_volume        1295.0(6)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7227191