Organosilicon linkers in metal organic frameworks: the tetrahedral tetrakis(4-tetrazolylphenyl)silane ligand.
Timokhin, Ivan; Baguña Torres, Júlia; White, Andrew J. P.; Lickiss, Paul D.; Pettinari, Claudio; Davies, Robert P.; Dalton transactions (Cambridge, England : 2003) 42 (2013) 13806–13808; doi:10.1039/c3dt51863a

data_7021983
_publ_section_title
;
 Organosilicon linkers in metal organic frameworks: the tetrahedral
 tetrakis(4-tetrazolylphenyl)silane ligand.
;
_journal_issue                   38
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              13806
_journal_page_last               13808
_journal_paper_doi               10.1039/c3dt51863a
_journal_volume                  42
_journal_year                    2013
_chemical_formula_moiety         'C68 H61 Cl Cu4 N36 O4 Si2, 18(C3 H7 N O)'
_chemical_formula_sum            'C122 H187 Cl Cu4 N54 O22 Si2'
_chemical_formula_weight         3108.05
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           136
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4n 2n'
_symmetry_space_group_name_H-M   'P 42/m n m'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   18.5153(3)
_cell_length_b                   18.5153(3)
_cell_length_c                   25.0576(7)
_cell_measurement_reflns_used    7446
_cell_measurement_temperature    173
_cell_measurement_theta_max      72.3974
_cell_measurement_theta_min      2.3843
_cell_volume                     8590.2(3)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 8.2556
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.977
_diffrn_measurement_device_type  'OD Xcalibur PX Ultra'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance Ultra (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0621
_diffrn_reflns_av_sigmaI/netI    0.0425
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            21464
_diffrn_reflns_theta_full        72.00
_diffrn_reflns_theta_max         72.55
_diffrn_reflns_theta_min         2.97
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.424
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.43165
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
CrysAlisPro, Agilent Technologies, 
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET) 
(compiled May 16 2011,17:55:39) 
Empirical absorption correction using spherical harmonics, 
implemented in SCALE3 ABSPACK scaling algorithm. 
;
_exptl_crystal_colour            'Pale purple'
_exptl_crystal_density_diffrn    1.202
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prisms
_exptl_crystal_F_000             3268
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.08
_platon_squeeze_details
;
 Due to the severe disorder across symmetry, only the oxygen atoms of the
 coordinated solvent molecules could be reliably located. From the looks
 of the electron density maps, combined with the solvent list given by the
 chemist, the most likely solvent is dmf (C3H7NO).
 So, at the time of running SQUEEZE, the asu contents were low by
 0.5(C3H7N). However, SQUEEZE does not remove electron denisty that is
 within bonding distance of defined atoms, so the contribution of the
 carbonyl carbon would not be removed, meaning that 0.5(C2H7N) = 13 e/asu
 of that removed by SQUEEZE would be due to the coordinated solvent.
 
 SQUEEZE suggested 1679 e/cell = 104.9 e/asu.
 As detailed above, the disorder of the coordinated solvent accounts for
 13 e/asu of this, leaving 91.9 e/asu for the included solvent.
 The included solvent is presumed to be dmf (C3H7NO) = 40e.
 2.25dmf = 90e so this was used as the solvent present.
 2.25dmf per asu = 18dmf per Cu4 unit.
 
 Subsequent to SQUEEZE, the carbonyl carbon of only one of the
 coordinated solvent molecules was located.

 So, atom list low by 0.25(C3H7N) + 0.25(C2H7N) + 2.25(C3H7NO)
 = (C0.75 H1.75 N0.25) + (C0.5 H1.75 N0.25) + (C6.75 H15.75 N2.25 O2.25)
 = C8 H19.25 N2.75 O2.25, and UNIT low by C128 H308 N44 O36,
 i.e. C116 H64 N64 O8 Cl2 Cu8 Si4
;
_refine_diff_density_max         0.783
_refine_diff_density_min         -0.443
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.947
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         4463
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.947
_refine_ls_R_factor_all          0.0579
_refine_ls_R_factor_gt           0.0482
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0978P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1331
_refine_ls_wR_factor_ref         0.1396
_reflns_number_gt                3351
_reflns_number_total             4463
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3dt51863a.txt
_cod_data_source_block           IMP16-Cu
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_cell_volume        8590.2(4)
_cod_original_sg_symbol_H-M      P4(2)/mnm
_cod_database_code               7021983