The molecular and supramolecular structures of the isomeric compounds 5,7-dimethoxyimidazo[1,2-<i>c</i>]pyrimidine and 7-methoxy-1-methylimidazo[1,2-<i>a</i>]pyrimidin-5(1<i>H</i>)-one
Bueno, Jesus; Melguizo, Manuel; Quijano, M. Luisa; Low, John Nicolson; Acta Crystallographica Section C 59 (2003) o363–o366; doi:10.1107/S0108270103010266

data_2013476
_publ_section_title
;
 The molecular and supramolecular structures of the isomeric compounds
 5,7-dimethoxyimidazo[1,2-<i>c</i>]pyrimidine and
 7-methoxy-1-methylimidazo[1,2-<i>a</i>]pyrimidin-5(1<i>H</i>)-one
;
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o363
_journal_page_last               o366
_journal_paper_doi               10.1107/S0108270103010266
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          'C8 H9 N3 O2'
_chemical_formula_moiety         'C8 H9 N3 O2'
_chemical_formula_sum            'C8 H9 N3 O2'
_chemical_formula_weight         179.18
_chemical_melting_point          387
_chemical_name_systematic
;
5,7-dimethoxyimidazo[1,2-c]pyrimidine
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                69.426(3)
_cell_angle_beta                 83.093(4)
_cell_angle_gamma                79.189(4)
_cell_formula_units_Z            2
_cell_length_a                   3.8798(3)
_cell_length_b                   8.9183(6)
_cell_length_c                   12.6224(11)
_cell_measurement_reflns_used    1756
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.36
_cell_measurement_theta_min      3.45
_cell_volume                     400.93(5)
_computing_cell_refinement       'DENZO--SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'KappaCCD Server Software (Nonius, 1997)'
_computing_data_reduction        DENZO--SMN
_computing_molecular_graphics
'ORTEPII (Johnson, 1976) and PLATON (Spek, 2003)'
_computing_publication_material
'SHELXL97 and WordPerfect macro PRPKAPPA (Ferguson, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '\f scans and \w scans with \k offsets'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed X-ray tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.058
_diffrn_reflns_av_sigmaI/netI    0.0622
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6415
_diffrn_reflns_theta_full        27.36
_diffrn_reflns_theta_max         27.36
_diffrn_reflns_theta_min         3.45
_diffrn_standards_decay_%        negligible
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_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.484
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
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_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.10
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_refine_diff_density_min         -0.322
_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
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_refine_ls_number_reflns         1756
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.0891
_refine_ls_R_factor_gt           0.0525
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0751P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1188
_refine_ls_wR_factor_ref         0.1336
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_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ln1168.cif
_cod_data_source_block           I
_cod_original_cell_volume        400.94(5)
_cod_database_code               2013476
_cod_database_fobs_code          2013476