Structure and bonding in the d4/d3 alkyne redox pairs [WX(CO)(MeCCMe)Tp′]z (X = F, Cl, Br and I; z = 0 and 1): halide stabilisation of electron deficient metal alkyne complexes
Bartlett, Ian M.; Carlton, Susannah; Connelly, Neil G.; Harding, David J.; Hayward, Owen D.; Guy Orpen, A.; Ray, Christopher D.; Rieger, Philip H.; Chemical Communications  (1999) 2403–; doi:10.1039/a907912b

data_7110736
_publ_section_title
;
 Structure and bonding in the d4/d3 alkyne redox pairs
 [WX(CO)(MeC&#xE007;CMe)Tp&#x2032;]z (X = F, Cl, Br and I; z = 0 and 1):
 halide stabilisation of electron deficient metal alkyne complexes
;
_journal_issue                   23
_journal_name_full               'Chemical Communications'
_journal_page_first              2403
_journal_paper_doi               10.1039/a907912b
_journal_year                    1999
_chemical_formula_sum            'C20 H28 B2 Br F4 N6 O W'
_chemical_formula_weight         729.86
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                89.028(10)
_cell_angle_beta                 85.677(7)
_cell_angle_gamma                85.247(11)
_cell_formula_units_Z            2
_cell_length_a                   8.1498(15)
_cell_length_b                   11.8631(19)
_cell_length_c                   13.4742(14)
_cell_measurement_reflns_used    222
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.53
_cell_measurement_theta_min      1.52
_cell_volume                     1294.5(3)
_computing_cell_refinement       'SAINT (Siemens, 1995b)'
_computing_data_collection       'SMART (Siemens, 1995b)'
_computing_data_reduction        'SAINT (Siemens, 1995b)'
_computing_molecular_graphics    'SHELXL-97 (Sheldrick, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Siemens SMART CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_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  0.0464
_diffrn_reflns_av_sigmaI/netI    0.0718
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            13510
_diffrn_reflns_theta_full        27.53
_diffrn_reflns_theta_max         27.53
_diffrn_reflns_theta_min         1.52
_exptl_absorpt_coefficient_mu    6.059
_exptl_absorpt_correction_T_max  0.694166
_exptl_absorpt_correction_T_min  0.392608
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS, Sheldrick 1996'
_exptl_crystal_colour            'Dark green'
_exptl_crystal_density_diffrn    1.873
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             706
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.096
_refine_diff_density_min         -1.741
_refine_diff_density_rms         0.142
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.890
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     324
_refine_ls_number_reflns         5869
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.890
_refine_ls_R_factor_all          0.0375
_refine_ls_R_factor_gt           0.0293
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0155P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0571
_refine_ls_wR_factor_ref         0.0583
_reflns_number_gt                4895
_reflns_number_total             5869
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            907912bsup1.cif
_cod_data_source_block           '[WBr(CO)(MeCCMe)Tp'][BF4]'
_cod_depositor_comments
;
The following automatic conversions were performed:

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

'_exptl_absorpt_correction_type' value 'Empirical'
changed to 'empirical' 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_sg_symbol_H-M      P-1
_cod_database_code               7110736