Sterically crowded diphosphinomethane ligands: molecular structures, UV-photoelectron spectroscopy and a convenient general synthesis of tBu2PCH2PtBu2 and related species
Eisenträger, Frank; Göthlich, Alexander; Gruber, Irene; Heiss, Helmut; Kiener, Christoph A.; Krüger, Carl; Ulrich Notheis, J.; Rominger, Frank; Scherhag, Gunter; Schultz, Madeleine; Straub, Bernd F.; Volland, Martin A. O.; Hofmann, Peter; New Journal of Chemistry 27 (2003) 540–550; doi:10.1039/b210114a

data_7050489
_publ_section_title
;
 Sterically crowded diphosphinomethane ligands: molecular structures,
 UV-photoelectron spectroscopy and a convenient general synthesis of
 tBu2PCH2PtBu2 and related species
;
_journal_issue                   3
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              540
_journal_page_last               550
_journal_paper_doi               10.1039/b210114a
_journal_volume                  27
_journal_year                    2003
_chemical_formula_moiety         'C17 H38 P2'
_chemical_formula_sum            'C17 H38 P2'
_chemical_formula_weight         304.41
_chemical_name_common            dtbpm
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.35650(10)
_cell_length_b                   17.3925(2)
_cell_length_c                   12.5085(2)
_cell_measurement_temperature    233(2)
_cell_volume                     2035.54(5)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      233(2)
_diffrn_measurement_device       'Siemens Smart CCD'
_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  0.0310
_diffrn_reflns_av_sigmaI/netI    0.0214
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            16625
_diffrn_reflns_theta_max         25.57
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    0.204
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    0.993
_exptl_crystal_description       irregular
_exptl_crystal_F_000             680
_exptl_crystal_size_max          .55
_exptl_crystal_size_mid          .50
_exptl_crystal_size_min          .16
_refine_diff_density_max         0.410
_refine_diff_density_min         -0.146
_refine_diff_density_rms         0.026
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.14(29)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.083
_refine_ls_goodness_of_fit_obs   1.058
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     368
_refine_ls_number_reflns         3524
_refine_ls_number_restraints     931
_refine_ls_restrained_S_all      1.416
_refine_ls_restrained_S_obs      1.440
_refine_ls_R_factor_all          0.0542
_refine_ls_R_factor_obs          0.0405
_refine_ls_shift/esd_max         2.125
_refine_ls_shift/esd_mean        0.241
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0671P)^2^+0.3058P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1299
_refine_ls_wR_factor_obs         0.1103
_reflns_number_observed          2874
_reflns_number_total             3534
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b210114a.txt
_cod_data_source_block           ig1_dtbpm_1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0671P)^2^+0.3058P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0671P)^2^+0.3058P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      Pna2(1)
_cod_database_code               7050489