Cyclic water pentamer in a tape-like structure
Ma, Bao-Qing; Sun, Hao-Ling; Gao, Song; Chemical Communications  (2004) 2220–2221; doi:10.1039/b404364b

data_7110300
_publ_section_title
;
 Cyclic water pentamer in a tape-like structure
;
_journal_issue                   19
_journal_name_full               'Chemical Communications'
_journal_page_first              2220
_journal_page_last               2221
_journal_paper_doi               10.1039/b404364b
_journal_year                    2004
_chemical_formula_sum            'C10 H16 N4 O6'
_chemical_formula_weight         288.27
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.52(2)
_cell_length_b                   9.645(7)
_cell_length_c                   6.643(6)
_cell_measurement_temperature    276(1)
_cell_volume                     1379(2)
_computing_cell_refinement       SMART
_computing_data_collection       SMART
_computing_data_reduction        SAINT
_computing_molecular_graphics    XP
_computing_publication_material  XCIF
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      276(1)
_diffrn_measured_fraction_theta_full 0.870
_diffrn_measured_fraction_theta_max 0.870
_diffrn_measurement_device_type  'SMART CCD 1000'
_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  0.1367
_diffrn_reflns_av_sigmaI/netI    0.0898
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            3484
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         1.89
_exptl_absorpt_coefficient_mu    0.116
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.388
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             608
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.272
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.074
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00
_refine_ls_extinction_coef       0.048(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.964
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     246
_refine_ls_number_reflns         2274
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.964
_refine_ls_R_factor_all          0.1117
_refine_ls_R_factor_gt           0.0766
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1557P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1925
_refine_ls_wR_factor_ref         0.2296
_reflns_number_gt                1389
_reflns_number_total             2274
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b404364bsup1.cif
_cod_data_source_block           new
_cod_original_sg_symbol_H-M      Pca2(1)
_cod_database_code               7110300