A molecular mechanics approach to mapping the conformational space of diaryl and triarylphosphines.
Fey, Natalie; Howell, James A. S.; Lovatt, Jonathan D.; Yates, Paul C.; Cunningham, Desmond; McArdle, Patrick; Gottlieb, Hugo E.; Coles, Simon J.; Dalton transactions (Cambridge, England : 2003)  (2006) 5464–5475; doi:10.1039/b610123b

data_7007787
_publ_section_title
;
 A molecular mechanics approach to mapping the conformational space of
 diaryl and triarylphosphines.
;
_journal_issue                   46
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              5464
_journal_page_last               5475
_journal_paper_doi               10.1039/b610123b
_journal_year                    2006
_chemical_formula_analytical     'C 20 H 17 O 5 P 1 Cr 1'
_chemical_formula_sum            'C20 H17 Cr O5 P'
_chemical_formula_weight         420.31
_chemical_name_common
Pentacarbonyl(methylbis(2-methylphenyl)phosphine)chromium
_chemical_name_systematic
;
Pentacarbonyl[methylbis(2-methylphenyl)phosphine]chromium
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_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                 96.620(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.7630(10)
_cell_length_b                   13.300(2)
_cell_length_c                   14.2690(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.0
_cell_measurement_theta_min      16.0
_cell_volume                     2029.0(4)
_computing_cell_refinement       'Nonius Software'
_computing_data_collection       'Nonius Software'
_computing_data_reduction        'Nonius Software'
_computing_molecular_graphics    'ORTEX (McArdle 1994)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       CAD4
_diffrn_measurement_method       Theta/2*Theta
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0513
_diffrn_reflns_av_sigmaI/netI    0.0300
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6371
_diffrn_reflns_theta_max         29.97
_diffrn_reflns_theta_min         2.10
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  30
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.669
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.376
_exptl_crystal_description       Block
_exptl_crystal_F_000             864
_exptl_crystal_size_max          0.65
_exptl_crystal_size_mid          0.55
_exptl_crystal_size_min          0.34
_refine_diff_density_max         0.499
_refine_diff_density_min         -0.421
_refine_diff_density_rms         0.090
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.042
_refine_ls_goodness_of_fit_obs   1.140
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         5899
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.042
_refine_ls_restrained_S_obs      1.140
_refine_ls_R_factor_all          0.0580
_refine_ls_R_factor_obs          0.0443
_refine_ls_shift/esd_max         -0.195
_refine_ls_shift/esd_mean        0.026
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1425
_refine_ls_wR_factor_obs         0.1342
_reflns_number_observed          4419
_reflns_number_total             5899
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b610123b.txt
_cod_data_source_block           6e_jh55
_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.

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^)+(0.1000P)^2^+0.0000P] 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^)+(0.1000P)^2^+0.0000P] 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      P21/n
_cod_database_code               7007787