Anhydrates and/or hydrates in nitrate, sulphate and phosphate salts of 4-aminopyridine, (4-AP) and 3,4-diaminopyridine (3,4-DAP): the role of the water molecules in the hydrates
Hursthouse, Michael B.; Montis, Riccardo; Niitsoo, Liisa; Sarson, Jonathan; Threlfall, Terence L.; Asiri, Abdullah Mohamed; Khan, Salman Ahmad; Obaid, Abdullah Yousef; Al-Harbi, Laila Mohammad; CrystEngComm 16 (2014) 2205–; doi:10.1039/c3ce42471e

data_7213920
_publ_section_title
;
 Anhydrates and/or hydrates in nitrate, sulphate and phosphate salts of
 4-aminopyridine, (4-AP) and 3,4-diaminopyridine (3,4-DAP): the role of
 the water molecules in the hydrates
;
_journal_issue                   11
_journal_name_full               CrystEngComm
_journal_page_first              2205
_journal_paper_doi               10.1039/c3ce42471e
_journal_volume                  16
_journal_year                    2014
_chemical_formula_moiety         'C5 H7 N2, H O4 S'
_chemical_formula_sum            'C5 H8 N2 O4 S'
_chemical_formula_weight         192.19
_chemical_name_common            4-aminopyridinium_hydrogenosulfate
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 102.988(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.9507(4)
_cell_length_b                   6.4615(2)
_cell_length_c                   11.2614(3)
_cell_measurement_reflns_used    7281
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.91
_cell_volume                     776.45(4)
_computing_cell_refinement
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_data_collection       'COLLECT (Hooft, R.W.W., 1998)'
_computing_data_reduction
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type
'Bruker-Nonius Roper CCD camera on \k-goniostat'
_diffrn_measurement_method       '\f & \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker-Nonius FR591 rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0298
_diffrn_reflns_av_sigmaI/netI    0.0239
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            10095
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.95
_exptl_absorpt_coefficient_mu    0.393
_exptl_absorpt_correction_T_max  0.9730
_exptl_absorpt_correction_T_min  0.8127
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2007/2 (Sheldrick, G.M., 2007)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.644
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.313
_refine_diff_density_min         -0.574
_refine_diff_density_rms         0.064
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         1776
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.065
_refine_ls_R_factor_all          0.0409
_refine_ls_R_factor_gt           0.0330
_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^)+(0.0556P)^2^+0.2811P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0944
_refine_ls_wR_factor_ref         0.1000
_reflns_number_gt                1489
_reflns_number_total             1776
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c3ce42471e.txt
_cod_data_source_block           4-aminopyridinium_sulfate
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7213920