W2Cl4(NR2)2(PR'3)2 Molecules. 4. A New Synthetic Route to Products with a Staggered Conformation. Preparations and Characterizations of W2Cl4(NR2)2(PR'3)2 (R = Et, Bu, Hex; R'3= Me3, Et2H) and an Intermediate Complex W2Cl4(NEt2)2(NHEt2)2
F. Albert Cotton; Evgeny V. Dikarev; N. Nawar; Wai-Yeung Wong; Inorganic Chemistry 36 (1997) 559–566; doi:10.1021/ic9610694

data_4323320
_publ_section_title
;
 W2Cl4(NR2)2(PR'3)2 Molecules. 4. A New Synthetic Route to Products with a
 Staggered Conformation. Preparations and Characterizations of
 W2Cl4(NR2)2(PR'3)2 (R = Et, Bu, Hex; R'3= Me3, Et2H) and an Intermediate
 Complex W2Cl4(NEt2)2(NHEt2)2
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              559
_journal_page_last               566
_journal_paper_doi               10.1021/ic9610694
_journal_volume                  36
_journal_year                    1997
_chemical_compound_source        synthesized
_chemical_formula_analytical     'not measured'
_chemical_formula_moiety         'C24 H58 Cl4 N2 P2 W2'
_chemical_formula_structural     W2Cl4(NBu2)2(PEt2H)2
_chemical_formula_sum            'C24 H58 Cl4 N2 P2 W2'
_chemical_formula_weight         946.16
_chemical_melting_point          ?
_chemical_name_common
;
 cis,cis-Tetrachloro-bis(dibutylamido)-bis(diethyl-
 phosphine) ditungsten(III)
;
_chemical_name_systematic
; 
 1,1,2,2-Tetrachloro-1,2-bis(dibutylamido)-(cis,cis)-
 1,2-bis(diethylphosphine) ditungsten(III) 
;
_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                 115.43(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.970(3)
_cell_length_b                   10.993(2)
_cell_length_c                   20.689(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      18.59
_cell_measurement_theta_min      9.13
_cell_volume                     3691.0(12)
_computing_cell_refinement       'TEXSAN-TEXRAY (1985)'
_computing_data_collection       'TEXSAN-TEXRAY (1985)'
_computing_data_reduction        'TEXSAN-TEXRAY (1985)'
_computing_molecular_graphics    'SHELXTL V.5 (Siemens, 1994)'
_computing_publication_material  CIFTAB
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXTL V.5 (Siemens, 1994)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Rigaku AFC5R'
_diffrn_measurement_method       \w-2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54060
_diffrn_reflns_av_R_equivalents  0.0313
_diffrn_reflns_av_sigmaI/netI    0.0552
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            5695
_diffrn_reflns_theta_max         60.01
_diffrn_reflns_theta_min         2.73
_diffrn_standards_decay_%        9.5
_diffrn_standards_interval_count 250
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    14.940
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7365
_exptl_absorpt_correction_type   'empirical via \y scans'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.703
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    none
_exptl_crystal_description       block-shaped
_exptl_crystal_F_000             1848
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.741
_refine_diff_density_min         -1.389
_refine_diff_density_rms         0.119
_refine_ls_extinction_coef       0.00040(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_all   1.067
_refine_ls_goodness_of_fit_obs   1.075
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     301
_refine_ls_number_reflns         5491
_refine_ls_number_restraints     22
_refine_ls_restrained_S_all      1.078
_refine_ls_restrained_S_obs      1.073
_refine_ls_R_factor_all          0.0738
_refine_ls_R_factor_obs          0.0410
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0252P)^2^+20.5509P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1127
_refine_ls_wR_factor_obs         0.0949
_reflns_number_observed          4002
_reflns_number_total             5496
_reflns_observed_criterion       I>2\s(I)
_cod_data_source_file            ic9610694_5.cif
_cod_data_source_block           W2Cl4(NBu2)2(PEt2H)2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value 'not measured' was changed to '?' -
the value is undefined or not given.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0252P)^2^+20.5509P] 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^)+(0.0252P)^2^+20.5509P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        3691(1)
_cod_database_code               4323320