Crystal packing and melting temperatures of small oxalate esters: the role of C—H···O hydrogen bonding
Joseph, Sumy; Sathishkumar, Ranganathan; Mahapatra, Sudarshan; Desiraju, Gautam R.; Acta Crystallographica Section B 67 (2011) 525–534; doi:10.1107/S0108768111037487

data_2105025
_publ_section_title
;
 Crystal packing and melting temperatures of small oxalate esters: the
 role of C---H&#x00B7;&#x00B7;&#x00B7;O hydrogen bonding
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              525
_journal_page_last               534
_journal_paper_doi               10.1107/S0108768111037487
_journal_volume                  67
_journal_year                    2011
_chemical_formula_moiety         'C4 H6 O4'
_chemical_formula_sum            'C4 H6 O4'
_chemical_formula_weight         118.09
_chemical_name_common            'Dimethyl oxalate'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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
_cell_angle_alpha                90
_cell_angle_beta                 103.37(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   3.873(2)
_cell_length_b                   11.875(4)
_cell_length_c                   6.205(2)
_cell_measurement_reflns_used    515
_cell_measurement_temperature    273
_cell_measurement_theta_max      25.42
_cell_measurement_theta_min      3.43
_cell_volume                     277.6(2)
_computing_cell_refinement       'CrysAlisPro CCD (Oxford Diffraction, 2009)'
_computing_data_collection       'CrysAlisPro CCD (Oxford Diffraction, 2009)'
_computing_data_reduction        'CrysAlisPro RED (Oxford Diffraction, 2009)'
_computing_molecular_graphics
'Ortep-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1993)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97  (Sheldrick, 2008)'
_diffrn_ambient_temperature      273
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Oxford Xcalibur,Eos(Nova) CCD detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0633
_diffrn_reflns_av_sigmaI/netI    0.0355
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            3942
_diffrn_reflns_reduction_process
;
;
_diffrn_reflns_theta_full        25.42
_diffrn_reflns_theta_max         25.42
_diffrn_reflns_theta_min         3.43
_exptl_absorpt_coefficient_mu    0.129
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.412
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             124
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.170
_refine_diff_density_max         0.209
_refine_diff_density_min         -0.175
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     49
_refine_ls_number_reflns         515
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.0924
_refine_ls_R_factor_gt           0.0554
_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^)+(0.0970P)^2^]         where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1423
_refine_ls_wR_factor_ref         0.1606
_reflns_number_gt                319
_reflns_number_total             515
_reflns_threshold_expression     >2\s(i)
_cod_data_source_file            og5050.cif
_cod_data_source_block           DMO273
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        277.7(2)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2105025