Pb2TiOF(SeO3)2Cl and Pb2NbO2(SeO3)2Cl: small changes in structure induced a very large SHG enhancement
Xue-Li Cao; Chun-Li Hu; Xiang Xu; Fang Kong; Jiang-Gao Mao; Chem.Commun. 49 (2013) 9965–; doi:10.1039/c3cc45747h

data_7109946
_publ_section_title
;
 Pb2TiOF(SeO3)2Cl and Pb2NbO2(SeO3)2Cl: small changes in structure induced
 a very large SHG enhancement
;
_journal_name_full               Chem.Commun.
_journal_page_first              9965
_journal_paper_doi               10.1039/c3cc45747h
_journal_volume                  49
_journal_year                    2013
_chemical_formula_sum            'Cl Nb O8 Pb2 Se2'
_chemical_formula_weight         828.66
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   none
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 111.753(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.5110(5)
_cell_length_b                   5.4148(2)
_cell_length_c                   10.7300(6)
_cell_measurement_reflns_used    2801
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.6199
_cell_measurement_theta_min      3.7553
_cell_volume                     459.28(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_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  0.0438
_diffrn_reflns_av_sigmaI/netI    0.0556
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            2925
_diffrn_reflns_theta_full        25.68
_diffrn_reflns_theta_max         25.68
_diffrn_reflns_theta_min         3.84
_exptl_absorpt_coefficient_mu    46.023
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.23546
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    5.992
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rodlike
_exptl_crystal_F_000             708
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.07
_refine_diff_density_max         2.107
_refine_diff_density_min         -1.914
_refine_diff_density_rms         0.334
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.010(9)
_refine_ls_extinction_coef       0.0071(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   1.062
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     128
_refine_ls_number_reflns         1626
_refine_ls_number_restraints     13
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0333
_refine_ls_R_factor_gt           0.0313
_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^)+(0.0325P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0680
_refine_ls_wR_factor_ref         0.0686
_reflns_number_gt                1596
_reflns_number_total             1626
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3cc45747h.cif
_cod_data_source_block           Pb2NbO2(SeO3)2Cl
_cod_original_cell_volume        459.28(4)
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7109946