Hydrogen-bonding patterns in a series of multi-component molecular solids formed by 2,3,5,6-tetramethylpyrazine with selected carboxylic acids
Wang, Lei; Xue, Ruiyu; Li, Yuanxin; Zhao, Yiran; Liu, Faqian; Huang, Keke; CrystEngComm 16 (2014) 7074–; doi:10.1039/C4CE00749B

data_7217373
_publ_section_title
;
 Hydrogen-bonding patterns in a series of multi-component molecular solids
 formed by 2,3,5,6-tetramethylpyrazine with selected carboxylic acids
;
_journal_issue                   30
_journal_name_full               CrystEngComm
_journal_page_first              7074
_journal_paper_doi               10.1039/C4CE00749B
_journal_volume                  16
_journal_year                    2014
_chemical_formula_moiety         'C16 H18 N2 O4'
_chemical_formula_sum            'C16 H18 N2 O4'
_chemical_formula_weight         302.32
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
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_symmetry_space_group_name_Hall  '-P 1'
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_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                99.769(4)
_cell_angle_beta                 103.689(4)
_cell_angle_gamma                108.465(3)
_cell_formula_units_Z            2
_cell_length_a                   7.5343(14)
_cell_length_b                   8.9454(17)
_cell_length_c                   12.885(3)
_cell_measurement_temperature    293(2)
_cell_volume                     771.6(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 'ACTA 50'
_diffrn_measured_fraction_theta_max 0.921
_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  0.0486
_diffrn_reflns_av_sigmaI/netI    0.0793
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            4994
_diffrn_reflns_theta_full        'ACTA 50'
_diffrn_reflns_theta_max         28.36
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.0001
_exptl_absorpt_correction_T_min  0.0001
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.301
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             320
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.347
_refine_diff_density_min         -0.545
_refine_diff_density_rms         0.104
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         3537
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0967
_refine_ls_R_factor_gt           0.0873
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1743P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2292
_refine_ls_wR_factor_ref         0.2474
_reflns_number_gt                2786
_reflns_number_total             3537
_reflns_threshold_expression     >2sigma(I)
_cod_duplicate_entry             7215858
_cod_data_source_file            c4ce00749b2.cif
_cod_data_source_block           compound6
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7217373