An Iron-Capped Metal-Organic Polyyne: {[Fe](C\τbC)2[W]\τbCC\τbCC\τb[W](C\τbC)2[Fe]}
Sergey N. Semenov; Shiva F. Taghipourian; Olivier Blacque; Thomas Fox; Koushik Venkatesan; Heinz Berke; Journal of the American Chemical Society 132 (2010) 7584–7585; doi:10.1021/ja102570f

data_4102514
_publ_section_title
;
 An Iron-Capped Metal-Organic Polyyne:
 {[Fe](C\\tbC)2[W]\\tbCC\\tbCC\\tb[W](C\\tbC)2[Fe]}
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7584
_journal_page_last               7585
_journal_paper_doi               10.1021/ja102570f
_journal_volume                  132
_journal_year                    2010
_chemical_formula_sum            'C116 H98 P8 W2'
_chemical_formula_weight         2107.39
_chemical_name_systematic
;
[(\m-but-2-yn-1,4-diylidyne)bis(di{1,2-bis(diphenylphosphino)ethane}
(buta-1,3-diynyl)tungsten)]
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_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                 103.530(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   36.6258(11)
_cell_length_b                   13.1143(4)
_cell_length_c                   20.2917(5)
_cell_measurement_reflns_used    7425
_cell_measurement_temperature    183(2)
_cell_measurement_theta_max      28.8352
_cell_measurement_theta_min      2.5811
_cell_volume                     9476.1(5)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.41 (release 06-05-2009 CrysAlis171 .NET)
(compiled May  6 2009,17:20:42)
;
_computing_data_collection
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CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.41 (release 06-05-2009 CrysAlis171 .NET)
(compiled May  6 2009,17:20:42)
;
_computing_data_reduction
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CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.41 (release 06-05-2009 CrysAlis171 .NET)
(compiled May  6 2009,17:20:42)
;
_computing_molecular_graphics
; ORTEP-3 for Windows, Version 2.01.
  Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565.
;
_computing_publication_material
; WinGX -- An integrated system of Windows programs for the solution,
 refinment and analysis of single crystal X-ray diffraction data,
 Version 1.80.00.
 Farrugia, L. J. (1999). J. Appl. Cryst. 32, 837-838.
 SHELXL97. Program for crystal structure refinement.
 Sheldrick, G.M. (2008). Acta Cryst. A64, 112-122.
 PLATON for Windows, Version 1.12.
 Spek, A. L. (2003). J. Appl. Cryst. 36, 7-13. 
;
_computing_structure_refinement
; SHELXL97. Program for crystal structure refinement.
  Sheldrick, G.M. (2008). Acta Cryst. A64, 112-122.
;
_computing_structure_solution
; SHELXS97. Program for Crystal Structure solution.
  Sheldrick, G.M. (2008). Acta Cryst. A64, 112-122.  
;
_diffrn_ambient_temperature      183(2)
_diffrn_detector_area_resol_mean 10.4498
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type
; Goniometer Xcalibur, detector: Ruby
Oxford Diffraction (2007). Oxford Diffraction Ltd.,
Xcalibur CCD system
;
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0815
_diffrn_reflns_av_sigmaI/netI    0.1490
_diffrn_reflns_limit_h_max       44
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            35043
_diffrn_reflns_theta_full        25.68
_diffrn_reflns_theta_max         25.68
_diffrn_reflns_theta_min         2.58
_exptl_absorpt_coefficient_mu    2.612
_exptl_absorpt_correction_T_max  0.933
_exptl_absorpt_correction_T_min  0.796
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.41 (release 06-05-2009 CrysAlis171 .NET)
(compiled May  6 2009,17:20:42)
Analytical numeric absorption correction using a multifaceted crystal
model based on expressions derived by R.C. Clark & J.S. Reid.
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897)
;
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.477
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             4248
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.04
_refine_diff_density_max         1.545
_refine_diff_density_min         -0.812
_refine_diff_density_rms         0.100
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.752
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     568
_refine_ls_number_reflns         8990
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.752
_refine_ls_R_factor_all          0.0896
_refine_ls_R_factor_gt           0.0376
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0089P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0446
_refine_ls_wR_factor_ref         0.0494
_reflns_number_gt                5286
_reflns_number_total             8990
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja102570f_si_003.cif
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               4102514