Structural distortions in the high-pressure polar phases of ammonium metal formates
Collings, Ines E.; Bykov, Maxim; Bykova, Elena; Tucker, Matthew G.; Petitgirard, Sylvain; Hanfland, Michael; Glazyrin, Konstantin; van Smaalen, Sander; Goodwin, Andrew L.; Dubrovinsky, Leonid; Dubrovinskaia, Natalia; CrystEngComm 18 (2016) 8849–; doi:10.1039/C6CE01891B

data_7226832
_publ_section_title
;
 Structural distortions in the high-pressure polar phases of ammonium
 metal formates
;
_journal_issue                   46
_journal_name_full               CrystEngComm
_journal_page_first              8849
_journal_paper_doi               10.1039/C6CE01891B
_journal_volume                  18
_journal_year                    2016
_chemical_formula_sum            'C3 H7 N Ni O6'
_chemical_formula_weight         211.81
_chemical_name_systematic        'ammonium nickel formate'
_space_group_crystal_system      hexagonal
_space_group_IT_number           182
_space_group_name_Hall           'P 6c 2c'
_space_group_name_H-M_alt        'P 63 2 2'
_symmetry_space_group_name_Hall  'P 6c 2c'
_symmetry_space_group_name_H-M   'P 63 2 2'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014
_audit_update_record
;
2016-08-29 deposited with the CCDC.
2016-10-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   7.1208(6)
_cell_length_b                   7.1208(6)
_cell_length_c                   8.0513(4)
_cell_measurement_reflns_used    468
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      17.1110
_cell_measurement_theta_min      3.6260
_cell_volume                     353.55(5)
_computing_cell_refinement       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_solution    'SHELX (Sheldrick, 2007)'
_diffrn_ambient_pressure         'at 1.28 GPa'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.939
_diffrn_measured_fraction_theta_max 0.706
_diffrn_measurement_device_type  'ID09A beamline, ESRF'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.41168
_diffrn_reflns_av_R_equivalents  0.0323
_diffrn_reflns_av_unetI/netI     0.0404
_diffrn_reflns_Laue_measured_fraction_full 0.939
_diffrn_reflns_Laue_measured_fraction_max 0.706
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            1156
_diffrn_reflns_point_group_measured_fraction_full 0.942
_diffrn_reflns_point_group_measured_fraction_max 0.638
_diffrn_reflns_theta_full        14.301
_diffrn_reflns_theta_max         21.096
_diffrn_reflns_theta_min         2.931
_diffrn_source                   synchrotron
_exptl_absorpt_coefficient_mu    0.610
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.48868
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.41 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.990
_exptl_crystal_description       'hexagonal bipyramid'
_exptl_crystal_F_000             216
_exptl_crystal_size_max          0.055
_exptl_crystal_size_mid          0.055
_exptl_crystal_size_min          0.055
_refine_diff_density_max         0.673
_refine_diff_density_min         -0.549
_refine_diff_density_rms         0.085
_refine_ls_abs_structure_details
;
 Flack x determined using 74 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.22(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     22
_refine_ls_number_reflns         430
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.102
_refine_ls_R_factor_all          0.0682
_refine_ls_R_factor_gt           0.0496
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0430P)^2^+0.4766P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1086
_refine_ls_wR_factor_ref         0.1276
_reflns_Friedel_coverage         0.369
_reflns_Friedel_fraction_full    0.952
_reflns_Friedel_fraction_max     0.507
_reflns_number_gt                334
_reflns_number_total             430
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6ce01891b2.cif
_cod_data_source_block           ANiF_p02
_cod_depositor_comments
'Adding full bibliography for 7226831--7226836.cif.'
_cod_original_cell_volume        353.56(6)
_cod_database_code               7226832
_shelxl_version_number           2014-3
_shelx_res_checksum              99234