Four Polymorphs of Methyl Paraben: Structural Relationships and Relative Energy Differences.
Gelbrich, Thomas; Braun, Doris E.; Ellern, Arkady; Griesser, Ulrich J.; Crystal growth & design 13 (2013) 1206–1217; doi:10.1021/cg301639r

data_4507506
_publ_section_title
;
 Four Polymorphs of Methyl Paraben: Structural Relationships and Relative
 Energy Differences.
;
_journal_issue                   3
_journal_name_full               'Crystal growth &amp; design'
_journal_page_first              1206
_journal_page_last               1217
_journal_paper_doi               10.1021/cg301639r
_journal_volume                  13
_journal_year                    2013
_chemical_formula_moiety         'C8 H8 O3'
_chemical_formula_sum            'C8 H8 O3'
_chemical_formula_weight         152.14
_chemical_melting_point          385
_chemical_name_common            'methyl paraben'
_chemical_name_systematic
; 
methyl 4-hydroxybenzoate
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 96.526(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.9845(6)
_cell_length_b                   8.3384(6)
_cell_length_c                   14.4209(12)
_cell_measurement_reflns_used    774
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      29.1549
_cell_measurement_theta_min      3.4196
_cell_volume                     714.96(11)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.55 (release 05-01-2010 CrysAlis171 .NET)
(compiled Jan  5 2010,16:28:46)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.55 (release 05-01-2010 CrysAlis171 .NET)
(compiled Jan  5 2010,16:28:46)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.55 (release 05-01-2010 CrysAlis171 .NET)
(compiled Jan  5 2010,16:28:46)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 10.3575
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Xcalibur, Ruby, Gemini ultra'
_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  0.0421
_diffrn_reflns_av_sigmaI/netI    0.0493
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            2914
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         3.43
_exptl_absorpt_coefficient_mu    0.109
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.85372
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.413
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             320
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.210
_refine_diff_density_min         -0.206
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.982
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     112
_refine_ls_number_reflns         1331
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.982
_refine_ls_R_factor_all          0.0786
_refine_ls_R_factor_gt           0.0489
_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^)+(0.0535P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1052
_refine_ls_wR_factor_ref         0.1187
_reflns_number_gt                906
_reflns_number_total             1331
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg301639r_si_001.cif
_cod_data_source_block           I-112
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4507506