Structural characterisation of a series of acetylide-functionalised oligopyridines and the synthesis, characterisation and optical spectroscopy of platinum di-ynes and poly-ynes containing oligopyridyl linker groups in the backbone
Muhammad S. Khan; Muna R. A. Al-Mandhary; Mohammed K. Al-Suti; Abdul Khader Hisahm; Paul R. Raithby; Birte Ahrens; Mary F. Mahon; Louise Male; Elisabeth A. Marseglia; Emilio Tedesco; Richard H. Friend; Anna Köhler; Neil Feeder; Simon J. Teat; J. Chem. Soc., Dalton Trans.  (2002) 1358–1368; doi:10.1039/b110658a

data_7011335
_publ_section_title
;
 Structural characterisation of a series of acetylide-functionalised
 oligopyridines and the synthesis, characterisation and optical
 spectroscopy of platinum di-ynes and poly-ynes containing oligopyridyl
 linker groups in the backbone
;
_journal_issue                   7
_journal_name_full               'J. Chem. Soc., Dalton Trans.'
_journal_page_first              1358
_journal_page_last               1368
_journal_paper_doi               10.1039/b110658a
_journal_year                    2002
_chemical_formula_sum            'C20 H24 N2 Si2'
_chemical_formula_weight         348.59
_chemical_name_systematic
; 
Compound 2a
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 92.68(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.024(3)
_cell_length_b                   10.645(4)
_cell_length_c                   17.768(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      15
_cell_measurement_theta_min      10
_cell_volume                     2082.8(11)
_computing_cell_refinement       'Stoe XRD software'
_computing_data_collection       'Stoe XRD software'
_computing_data_reduction        'Stoe XRD software'
_computing_molecular_graphics    'XSeed (J. Barbour, 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      180(2)
_diffrn_measured_fraction_theta_full 0.767
_diffrn_measured_fraction_theta_max 0.766
_diffrn_measurement_device_type  'Stoe 4 circle diffractometer'
_diffrn_measurement_method       'omega/2theta scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0171
_diffrn_reflns_av_sigmaI/netI    0.0202
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            4267
_diffrn_reflns_theta_full        55.00
_diffrn_reflns_theta_max         55.09
_diffrn_reflns_theta_min         4.01
_diffrn_standards_interval_count 100
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    1.556
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.5750
_exptl_absorpt_correction_type   'Semi-empirical based on psi scans'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.112
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.289
_refine_diff_density_min         -0.317
_refine_diff_density_rms         0.062
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.079
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     223
_refine_ls_number_reflns         2016
_refine_ls_number_restraints     18
_refine_ls_restrained_S_all      1.085
_refine_ls_R_factor_all          0.0578
_refine_ls_R_factor_gt           0.0517
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0894P)^2^+1.2719P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1364
_refine_ls_wR_factor_ref         0.1417
_reflns_number_gt                1773
_reflns_number_total             2016
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b110658a.txt
_cod_data_source_block           pr9819
_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 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7011335