The Melting Point Alternation in α,ω-Alkanedicarboxylic Acids
Venkat R. Thalladi; Markus Nüsse; Roland Boese; Journal of the American Chemical Society 122 (2000) 9227–9236; doi:10.1021/ja0011459

data_4116139
_publ_section_title
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 The Melting Point Alternation in \a,\w-Alkanedicarboxylic Acids
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_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9227
_journal_page_last               9236
_journal_paper_doi               10.1021/ja0011459
_journal_volume                  122
_journal_year                    2000
_chemical_compound_source        Fluka
_chemical_formula_moiety         'C2 H2 O4'
_chemical_formula_structural     'C2 H2 O4'
_chemical_formula_sum            'C2 H2 O4'
_chemical_formula_weight         90.04
_chemical_melting_point          462.5
_chemical_name_common            'Oxalic acid'
_chemical_name_systematic
; 
 Ethane-1,2-dioic acid 
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.49280(10)
_cell_length_b                   6.0600(2)
_cell_length_c                   7.8030(3)
_cell_measurement_temperature    130(2)
_cell_volume                     307.020(16)
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      130(2)
_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  0.0242
_diffrn_reflns_av_sigmaI/netI    0.0177
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -3
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -3
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2228
_diffrn_reflns_theta_max         28.33
_diffrn_reflns_theta_min         5.23
_exptl_absorpt_coefficient_mu    0.201
_exptl_crystal_density_diffrn    1.948
_exptl_crystal_F_000             184
_refine_diff_density_max         0.585
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.093
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.193
_refine_ls_goodness_of_fit_obs   1.248
_refine_ls_matrix_type           full
_refine_ls_number_parameters     32
_refine_ls_number_reflns         378
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.193
_refine_ls_restrained_S_obs      1.248
_refine_ls_R_factor_all          0.0455
_refine_ls_R_factor_obs          0.0415
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0705P)^2^+0.0195P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1066
_refine_ls_wR_factor_obs         0.1046
_reflns_number_observed          336
_reflns_number_total             378
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ja0011459_01.cif
_cod_data_source_block           disa23m
_cod_depositor_comments
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The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0705P)^2^+0.0195P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0705P)^2^+0.0195P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        307.02(2)
_cod_database_code               4116139