The bivalent metal hypophosphites Sr(H~2~PO~2~)~2~, Pb(H~2~PO~2~)~2~ and Ba(H~2~PO~2~)~2~
Kuratieva, Natalia V.; Naumova, Marina I.; Podberezskaya, Nina V.; Naumov, Dmitry Yu.; Acta Crystallographica Section C 61 (2005) i14–i16; doi:10.1107/S010827010403166X

data_2014759
_publ_section_title
;
 The bivalent metal hypophosphites Sr(H~2~PO~2~)~2~, Pb(H~2~PO~2~)~2~
 and Ba(H~2~PO~2~)~2~
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              i14
_journal_page_last               i16
_journal_paper_doi               10.1107/S010827010403166X
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'Sr (H2 P O2)2'
_chemical_formula_moiety         '2(H2 O2 P), Sr'
_chemical_formula_sum            'H4 O4 P2 Sr'
_chemical_formula_weight         217.59
_chemical_name_common            'Strontium bis(hypophosphite)'
_chemical_name_systematic
;
strontium bis(dihydrogenphosphate)
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 93.905(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.6553(16)
_cell_length_b                   5.9436(7)
_cell_length_c                   5.9177(7)
_cell_measurement_reflns_used    22
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13.899
_cell_measurement_theta_min      10.422
_cell_volume                     549.36(11)
_computing_cell_refinement       CD4CA0
_computing_data_collection       'CD4CA0 (Enraf--Nonius, 1989)'
_computing_data_reduction        'CADDAT (Enraf--Nonius, 1989)'
_computing_molecular_graphics    'BS (Kang & Ozawa, 2002)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       2\q/\q
_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  0.0398
_diffrn_reflns_av_sigmaI/netI    0.0671
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            530
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         2.61
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    10.305
_exptl_absorpt_correction_T_max  0.438
_exptl_absorpt_correction_T_min  0.426
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   '(CADDAT; Enraf--Nonius, 1989)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    2.631
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             416
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.964
_refine_diff_density_min         -0.679
_refine_ls_extinction_coef       0.0067(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   0.791
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     40
_refine_ls_number_reflns         477
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.791
_refine_ls_R_factor_all          0.0577
_refine_ls_R_factor_gt           0.0296
_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^)+(0.0363P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0667
_refine_ls_wR_factor_ref         0.0723
_reflns_number_gt                279
_reflns_number_total             477
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ta1468.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2014759