A Solid-State Spectral Effect in Eclipsed Tetracyanonickelates: X-ray Crystal Structure, Polarized Specular Reflectance Spectroscopy, and ZINDO Modeling of Sr[Ni(CN)4].5H2O, Rb2[Ni(CN)4].H2O, and Na2[Ni(CN)4].3H2O
Frank R. Fronczek; Terry J. Delord; Steven F. Watkins; Petia Gueorguieva; George G. Stanley; Annegret S. Zizza; Jeffrey B. Cornelius; Yves A. Mantz; Ronald L. Musselman; Inorganic Chemistry 42 (2003) 7026–7036; doi:10.1021/ic0345222

data_4312412
_publ_section_title
;
 A Solid-State Spectral Effect in Eclipsed Tetracyanonickelates: X-ray
 Crystal Structure, Polarized Specular Reflectance Spectroscopy, and ZINDO
 Modeling of Sr[Ni(CN)4].5H2O, Rb2[Ni(CN)4].H2O, and Na2[Ni(CN)4].3H2O
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              7026
_journal_page_last               7036
_journal_paper_doi               10.1021/ic0345222
_journal_volume                  42
_journal_year                    2003
_chemical_compound_source        'local laboratory'
_chemical_formula_moiety         'H20 O10 Sr2 4+, 2(C4 N4 Ni 2-)'
_chemical_formula_sum            'C8 H20 N8 Ni2 O10 Sr2'
_chemical_formula_weight         680.98
_chemical_name_systematic
;
 Strontium tetracyanonickelate(II) pentahydrate
;
_space_group_IT_number           12
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 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                 98.548(12)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.356(2)
_cell_length_b                   15.272(3)
_cell_length_c                   7.1331(10)
_cell_measurement_reflns_used    5067
_cell_measurement_temperature    100
_cell_measurement_theta_max      35.6
_cell_measurement_theta_min      2.5
_cell_volume                     1115.6(3)
_computing_cell_refinement       'Denzo and Scalepak (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius 1999)'
_computing_data_reduction        'Denzo and Scalepak (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'Direct_methods (SIR, Altomare, et al., 1994)'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device       'KappaCCD (with Oxford Cryostream)'
_diffrn_measurement_method       ' \w scans with \k offsets'
_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  0.018
_diffrn_reflns_av_sigmaI/netI    0.0264
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            29323
_diffrn_reflns_theta_full        35.6
_diffrn_reflns_theta_max         35.6
_diffrn_reflns_theta_min         2.6
_diffrn_standards_decay_%        <2
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    6.476
_exptl_absorpt_correction_T_max  0.523
_exptl_absorpt_correction_T_min  0.309
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'HKL Scalepack (Otwinowski & Minor 1997)'
_exptl_crystal_colour            'golden yellow'
_exptl_crystal_density_diffrn    2.027
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         1.14
_refine_diff_density_min         -0.72
_refine_diff_density_rms         0.129
_refine_ls_extinction_coef       0.0054(3)
_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   1.068
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     99
_refine_ls_number_reflns         2619
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.068
_refine_ls_R_factor_all          0.027
_refine_ls_R_factor_gt           0.024
_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^)+(0.0295P)^2^+1.0740P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.058
_refine_ls_wR_factor_ref         0.059
_reflns_number_gt                2426
_reflns_number_total             2619
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ic0345222si20030515_023032.cif
_cod_data_source_block           SrNiCN
_cod_original_sg_symbol_H-M      'C 2/m '
_cod_original_formula_moiety     'Sr 2+, C4 N4 Ni 2-, 5(H2 O)'
_cod_original_formula_sum        'C4 H10 N4 Ni O5 Sr'
_cod_original_formula_units_Z    4
_cod_original_formula_weight     340.49
_cod_database_code               4312412