Alternative solid-state forms of a potent antimalarial aminopyridine: X-ray crystallographic, thermal and solubility aspects
Cruickshank, Dyanne L.; Younis, Yassir; Njuguna, Nicholas M.; Ongarora, Dennis S. B.; Chibale, Kelly; Caira, Mino R.; CrystEngComm 16 (2014) 5781–; doi:10.1039/c3ce41798k

data_7216541
_publ_section_title
;
 Alternative solid-state forms of a potent antimalarial aminopyridine:
 X-ray crystallographic, thermal and solubility aspects
;
_journal_issue                   26
_journal_name_full               CrystEngComm
_journal_page_first              5781
_journal_paper_doi               10.1039/c3ce41798k
_journal_volume                  16
_journal_year                    2014
_chemical_formula_moiety         'C18 H18 N3 O3 S, 0.5(C2 O4), 4(H2 O)'
_chemical_formula_sum            'C19 H26 N3 O9 S'
_chemical_formula_weight         472.49
_chemical_melting_point          482
_chemical_name_common            '007 oxalic acid hydrate salt'
_chemical_name_systematic
; 
 3-6(-Methoxypyridin-3-yl)-5-(4-methylsulfonylphenyl)-
pyridine-2-amine.ethanedioate tetrahydrate 
;
_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                 106.774(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.581(2)
_cell_length_b                   5.1754(7)
_cell_length_c                   23.326(3)
_cell_measurement_reflns_used    4051
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.66
_cell_measurement_theta_min      2.42
_cell_volume                     2147.7(5)
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_collection       'Bruker Apex2'
_computing_data_reduction        'Bruker SAINT, SADABS and XPREP'
_computing_molecular_graphics
;
Mercury (Macrae at al., 2006) and POV-RAY (Cason, 2003)
;
_computing_publication_material  'PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXH-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker Kappa Apex II Duo diffractometer'
_diffrn_measurement_method       'phi-scan of 0.5 deg.'
_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  0.0367
_diffrn_reflns_av_sigmaI/netI    0.0469
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            9436
_diffrn_reflns_theta_full        25.66
_diffrn_reflns_theta_max         25.66
_diffrn_reflns_theta_min         2.42
_exptl_absorpt_coefficient_mu    0.208
_exptl_absorpt_correction_T_max  0.9823
_exptl_absorpt_correction_T_min  0.9550
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.461
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             996
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.388
_refine_diff_density_min         -0.294
_refine_diff_density_rms         0.057
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.055
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     327
_refine_ls_number_reflns         4051
_refine_ls_number_restraints     9
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0653
_refine_ls_R_factor_gt           0.0434
_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^)+(0.0608P)^2^+0.6000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1078
_refine_ls_wR_factor_ref         0.1187
_reflns_number_gt                3035
_reflns_number_total             4051
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3ce41798k.txt
_cod_data_source_block           d:\dyanne\2012\struct~1\007oxa~1\oap21c
_cod_depositor_comments
'Adding full bibliography for 7216538--7216544.cif.'
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7216541