Detailed study of the phase transition in [Ni(H~2~O)~6~](NO~3~)~2~·(15-crown-5)·H~2~O and analysis in terms of mean-field theory
Siegler, Maxime A.; Parkin, Sean; Angel, Ross J.; Brock, Carolyn Pratt; Acta Crystallographica Section B 67 (2011) 130–143; doi:10.1107/S010876811100526X

data_2104921
_publ_section_title
;
 Detailed study of the phase transition in
 [Ni(H~2~O)~6~](NO~3~)~2~&#x00B7;(15-crown-5)&#x00B7;H~2~O and analysis
 in terms of mean-field theory
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              130
_journal_page_last               143
_journal_paper_doi               10.1107/S010876811100526X
_journal_volume                  67
_journal_year                    2011
_chemical_formula_moiety         'C10 H20 O5, H12 Ni O6 2+, 2(N O3 1-), H2 O'
_chemical_formula_sum            'C10 H34 N2 Ni O18'
_chemical_formula_weight         529.10
_chemical_name_systematic
'hexaaquanickel(II) nitrate (15-crown-5) monohydrate'
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_symmetry_space_group_name_Hall  'P 2yb (1/2*x,y,-1/2*x+z)'
_symmetry_space_group_name_H-M   'B 1 21 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.
_cell_angle_beta                 106.26(1)
_cell_angle_gamma                90.
_cell_formula_units_Z            8
_cell_length_a                   16.242(2)
_cell_length_b                   16.608(2)
_cell_length_c                   17.874(2)
_cell_measurement_reflns_used    5496
_cell_measurement_temperature    175(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     4628.6(10)
_computing_cell_refinement       'SCALEPACK (Otwinowski & Minor, 2006)'
_computing_data_collection       'COLLECT (Nonius, 2000)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 2006)'
_computing_molecular_graphics    'Mercury (Macrae et al., 2008)'
_computing_publication_material
;
SHELXL-97 (Sheldrick, 2008) and local procedures
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      175(2)
_diffrn_detector_area_resol_mean 18
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Nonius KappaCCD diffractometer'
_diffrn_measurement_method       '\w scans at fixed \c = 55\%'
_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  0.074
_diffrn_reflns_av_sigmaI/netI    0.0942
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            33236
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         1.50
_diffrn_standards_decay_%        <2
_exptl_absorpt_coefficient_mu    0.921
_exptl_absorpt_correction_T_max  0.8742
_exptl_absorpt_correction_T_min  0.7387
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Scalepack (Otwinowski & Minor, 2006)'
_exptl_crystal_colour            'pale green'
_exptl_crystal_density_diffrn    1.519
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             2240
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.857
_refine_diff_density_min         -0.377
_refine_diff_density_rms         0.072
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.078(9)
_refine_ls_extinction_coef       0.00013(4)
_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   1.055
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     648
_refine_ls_number_reflns         10609
_refine_ls_number_restraints     43
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.1230
_refine_ls_R_factor_gt           0.0450
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0254P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0766
_refine_ls_wR_factor_ref         0.0921
_reflns_number_gt                5726
_reflns_number_total             10609
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            hw5014.cif
_cod_data_source_block           175K_H
_cod_original_sg_symbol_H-M      'B 21'
_cod_database_code               2104921