The crystal structures of four dimethoxybenzaldehyde isomers
Brugman, Sander J. T.; Engwerda, Anthonius H. J.; Kalkman, Emma; de Ronde, Erik; Tinnemans, Paul; Vlieg, Elias; Acta Crystallographica Section E 75 (2019) 38–42; doi:10.1107/S2056989018017152

data_2242778
_publ_section_title
;
 The crystal structures of four dimethoxybenzaldehyde isomers
;
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              38
_journal_page_last               42
_journal_paper_doi               10.1107/S2056989018017152
_journal_volume                  75
_journal_year                    2019
_chemical_formula_iupac          'C9 H10 O3'
_chemical_formula_moiety         'C9 H10 O3'
_chemical_formula_sum            'C9 H10 O3'
_chemical_formula_weight         166.17
_chemical_melting_point          321
_chemical_name_systematic        2,5-Dimethoxybenzaldehyde
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2016/6
_cell_angle_alpha                90
_cell_angle_beta                 91.808(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   3.8780(3)
_cell_length_b                   11.5513(7)
_cell_length_c                   17.8153(12)
_cell_measurement_reflns_used    9955
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      36.2
_cell_measurement_theta_min      2.3
_cell_volume                     797.66(10)
_computing_cell_refinement
;
PEAKREF (Schreurs, 2013)
;
_computing_data_collection
;
APEX3 (Bruker, 2012)
;
_computing_data_reduction
;
SAINT (Bruker, 2012)
;
_computing_molecular_graphics
;
PLATON (Spek, 2009), <i>ShelXLe</i> (H\"ubschle <i>et al.</i>,
2011)
;
_computing_structure_refinement
;
<i>SHELXL2016/6</i> (Sheldrick, 2015b)
;
_computing_structure_solution
;
<i>SHELXT2014/4</i> (Sheldrick, 2015a)
;
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 10.4
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device       'Bruker D8 Quest APEX3'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0242
_diffrn_reflns_av_unetI/netI     0.0139
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            30235
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         36.351
_diffrn_reflns_theta_min         2.102
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  0.7471
_exptl_absorpt_correction_T_min  0.7048
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Krause et al., 2015)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.384
_exptl_crystal_description       needle
_exptl_crystal_F_000             352
_exptl_crystal_size_max          0.743
_exptl_crystal_size_mid          0.376
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.535
_refine_diff_density_min         -0.219
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     111
_refine_ls_number_reflns         3873
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0483
_refine_ls_R_factor_gt           0.0390
_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^)+(0.0691P)^2^+0.1755P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1130
_refine_ls_wR_factor_ref         0.1237
_reflns_number_gt                3276
_reflns_number_total             3873
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            zp2031sup1.cif
_cod_data_source_block           2,5DMBz
_cod_database_code               2242778
_cod_database_fobs_code          2242778
_shelx_estimated_absorpt_t_min   0.927
_shelx_estimated_absorpt_t_max   0.987
_shelx_hkl_checksum              9214
_shelx_res_checksum              92648