K2Sn2ZnSe6, Na2Ge2ZnSe6, and Na2In2GeSe6: a new series of quaternary selenides with intriguing structural diversity and nonlinear optical properties.
Zhou, Molin; Li, Chao; Li, Xiaoshuang; Yao, Jiyong; Wu, Yicheng; Dalton transactions (Cambridge, England : 2003) 45 (2016) 7627–7633; doi:10.1039/c6dt00143b

data_7038847
_publ_section_title
;
 K2Sn2ZnSe6, Na2Ge2ZnSe6, and Na2In2GeSe6: a new series of quaternary
 selenides with intriguing structural diversity and nonlinear optical
 properties.
;
_journal_issue                   18
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7627
_journal_page_last               7633
_journal_paper_doi               10.1039/c6dt00143b
_journal_volume                  45
_journal_year                    2016
_chemical_formula_sum            'Ge2 Na2 Se6 Zn'
_chemical_formula_weight         730.29
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           140
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4 2c'
_symmetry_space_group_name_H-M   'I 4/m c m'
_atom_sites_solution_hydrogens   none
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2016-03-14 deposited with the CCDC.
2016-03-21 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.7568(12)
_cell_length_b                   7.7568(12)
_cell_length_c                   18.734(4)
_cell_measurement_reflns_used    1885
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.3720
_cell_measurement_theta_min      2.8526
_cell_volume                     1127.2(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Rigaku AFC10 diffractometer'
_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  0.0579
_diffrn_reflns_av_sigmaI/netI    0.0240
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            3780
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         3.71
_exptl_absorpt_coefficient_mu    26.797
_exptl_absorpt_correction_T_max  0.420
_exptl_absorpt_correction_T_min  0.125
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'face indexed'
_exptl_crystal_colour            Green
_exptl_crystal_density_diffrn    4.303
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             1280
_exptl_crystal_size_max          0.2000
_exptl_crystal_size_mid          0.0750
_exptl_crystal_size_min          0.0400
_refine_diff_density_max         0.764
_refine_diff_density_min         -0.690
_refine_diff_density_rms         0.171
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.672
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     20
_refine_ls_number_reflns         338
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.672
_refine_ls_R_factor_all          0.0466
_refine_ls_R_factor_gt           0.0451
_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^)+(0.0300P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0991
_refine_ls_wR_factor_ref         0.0998
_reflns_number_gt                332
_reflns_number_total             338
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6dt00143b1.cif
_cod_data_source_block           p1
_cod_depositor_comments
'Adding full bibliography for 7038846--7038848.cif.'
_cod_original_sg_symbol_H-M      I4/mcm
_cod_database_code               7038847