Stabilizing volatile liquid chemicals using co-crystallization.
Aakeröy, Christer B; Wijethunga, Tharanga K.; Benton, Joshua; Desper, John; Chemical communications (Cambridge, England) 51 (2015) 2425–2428; doi:10.1039/c4cc09650a

data_7116255
_publ_section_title
;
 Stabilizing volatile liquid chemicals using co-crystallization.
;
_journal_issue                   12
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              2425
_journal_page_last               2428
_journal_paper_doi               10.1039/c4cc09650a
_journal_volume                  51
_journal_year                    2015
_chemical_formula_moiety         'C8 H12 N2 O2'
_chemical_formula_sum            'C8 H12 N2 O2'
_chemical_formula_weight         168.20
_chemical_name_systematic
'TW-Pyr-bis-N-oxide 2,3,5,6-Me4-pyrazine-1,4-dioxideC8 H12 N2 O2'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2014-12-02 deposited with the CCDC.
2015-01-02 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 98.770(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   3.8328(9)
_cell_length_b                   10.291(3)
_cell_length_c                   10.396(3)
_cell_measurement_reflns_used    2346
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      31.55
_cell_measurement_theta_min      2.80
_cell_volume                     405.26(19)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.967
_diffrn_measured_fraction_theta_max 0.913
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0283
_diffrn_reflns_av_sigmaI/netI    0.0281
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            4747
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         31.61
_diffrn_reflns_theta_min         2.80
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  0.9880
_exptl_absorpt_correction_T_min  0.9590
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.378
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             180
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.364
_refine_diff_density_min         -0.214
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.103
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     57
_refine_ls_number_reflns         1245
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.103
_refine_ls_R_factor_all          0.0578
_refine_ls_R_factor_gt           0.0456
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0700P)^2^+0.0800P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1251
_refine_ls_wR_factor_ref         0.1333
_reflns_number_gt                987
_reflns_number_total             1245
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4cc09650a2.cif
_cod_data_source_block           A2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 2935 2014-11-11 08:27:57Z andrius 

 Adding full bibliography for 7116251--7116256.cif.
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_cod_original_cell_volume        405.26(17)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7116255