A pair of new chiral polyoxovanadates with decent NLO properties.
Cao, Jiapeng; Xiong, Yao; Luo, Ximing; Chen, Lu; Shi, Jie; Zhou, Mengjie; Xu, Yan; Dalton transactions (Cambridge, England : 2003) 47 (2018) 6054–6058; doi:10.1039/c8dt00631h

data_7045954
_publ_section_title
;
 A pair of new chiral polyoxovanadates with decent NLO properties.
;
_journal_issue                   17
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              6054
_journal_page_last               6058
_journal_paper_doi               10.1039/c8dt00631h
_journal_volume                  47
_journal_year                    2018
_chemical_absolute_configuration D
_chemical_formula_sum            'C20 H40 N4 O20 V4'
_chemical_formula_weight         860.32
_space_group_crystal_system      orthorhombic
_space_group_IT_number           20
_space_group_name_Hall           'C 2c 2'
_space_group_name_H-M_alt        'C 2 2 21'
_symmetry_space_group_name_Hall  'C 2c 2'
_symmetry_space_group_name_H-M   'C 2 2 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2018-03-22 deposited with the CCDC.
2018-03-29 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.904(3)
_cell_length_b                   14.855(5)
_cell_length_c                   21.600(7)
_cell_measurement_reflns_used    3036
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.98
_cell_measurement_theta_min      2.47
_cell_volume                     3177.9(18)
_computing_cell_refinement       'SAINT (Bruker, 2005)'
_computing_data_collection       'APEX2 (Bruker, 2005)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.943
_diffrn_measurement_device_type  'Bruker Apex2 CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0719
_diffrn_reflns_av_unetI/netI     0.0675
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.943
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            11562
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.917
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.853
_diffrn_reflns_theta_min         1.886
_exptl_absorpt_coefficient_mu    1.231
_exptl_absorpt_correction_T_max  0.866
_exptl_absorpt_correction_T_min  0.837
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            yellowish-brown
_exptl_crystal_density_diffrn    1.798
_exptl_crystal_description       block
_exptl_crystal_F_000             1760
_exptl_crystal_size_max          0.150
_exptl_crystal_size_mid          0.130
_exptl_crystal_size_min          0.120
_refine_diff_density_max         1.709
_refine_diff_density_min         -0.955
_refine_diff_density_rms         0.144
_refine_ls_abs_structure_details
;
 Flack x determined using 963 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.03(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.115
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         3146
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.115
_refine_ls_R_factor_all          0.0858
_refine_ls_R_factor_gt           0.0749
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1104P)^2^+14.6136P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1937
_refine_ls_wR_factor_ref         0.2008
_reflns_Friedel_coverage         0.731
_reflns_Friedel_fraction_full    0.997
_reflns_Friedel_fraction_max     0.884
_reflns_number_gt                2697
_reflns_number_total             3146
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8dt00631h2.cif
_cod_data_source_block           a01
_cod_depositor_comments
'Adding full bibliography for 7045954--7045955.cif.'
_cod_original_cell_volume        3177.9(17)
_cod_database_code               7045954
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.837
_shelx_estimated_absorpt_t_max   0.866
_shelx_res_checksum              41282