An alternative approach: a highly selective dual responding fluoride sensor having active methylene group as binding site().
Das, Priyadip; Kesharwani, Manoj K.; Mandal, Amal K.; Suresh, Eringathodi; Ganguly, Bishwajit; Das, Amitava; Organic & biomolecular chemistry 10 (2012) 2263–2271; doi:10.1039/c2ob06815j

data_7152232
_publ_section_title
;
 An alternative approach: a highly selective dual responding fluoride
 sensor having active methylene group as binding site().
;
_journal_issue                   11
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2263
_journal_page_last               2271
_journal_paper_doi               10.1039/c2ob06815j
_journal_volume                  10
_journal_year                    2012
_chemical_formula_moiety         '(C48H40P2)2 (PF6)4 (CHCL3)2'
_chemical_formula_sum            'C49 H41 Cl3 F12 P4'
_chemical_formula_weight         1088.05
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.2290(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   20.4538(12)
_cell_length_b                   25.3853(15)
_cell_length_c                   19.2348(12)
_cell_measurement_reflns_used    2028
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      17.29
_cell_measurement_theta_min      2.16
_cell_volume                     9987.1(10)
_computing_cell_refinement       'BRUKER SMART'
_computing_data_collection       'BRUKER SMART'
_computing_data_reduction        'BRUKER SAINT'
_computing_molecular_graphics    ORTEP
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.973
_diffrn_measurement_device_type  'BRUKER SMART APEX CCD DIFFRACTOMETER'
_diffrn_measurement_method       'OMEGA-PHI SCAN'
_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  0.1229
_diffrn_reflns_av_sigmaI/netI    0.1414
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            43845
_diffrn_reflns_theta_full        23.50
_diffrn_reflns_theta_max         23.50
_diffrn_reflns_theta_min         1.28
_exptl_absorpt_coefficient_mu    0.391
_exptl_absorpt_correction_T_max  0.9259
_exptl_absorpt_correction_T_min  0.8406
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'BRUKER SADABS'
_exptl_crystal_colour            COLOURLESS
_exptl_crystal_density_diffrn    1.447
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             4432
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.797
_refine_diff_density_min         -0.529
_refine_diff_density_rms         0.091
_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     1225
_refine_ls_number_reflns         14757
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.115
_refine_ls_R_factor_all          0.2090
_refine_ls_R_factor_gt           0.1336
_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^)+(0.1168P)^2^+30.5460P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2789
_refine_ls_wR_factor_ref         0.3180
_reflns_number_gt                8439
_reflns_number_total             14757
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ob06815j.txt
_cod_data_source_block           dasnaphf
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'MONOCLINIC' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_refine_ls_weighting_scheme' value 'CALC' changed to
'calc' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7152232