Magnesium and zinc complexes of functionalised, saturated N-heterocyclic carbene ligands: carbene lability and functionalisation, and lactide polymerisation catalysis
Arnold, Polly L.; Casely, Ian J.; Turner, Zoë R.; Bellabarba, Ronan; Tooze, Robert B.; Dalton Transactions  (2009) 7236–; doi:10.1039/b907034f

data_7002120
_publ_section_title
;
 Magnesium and zinc complexes of functionalised, saturated
 N-heterocyclic carbene ligands: carbene lability and
 functionalisation, and lactide polymerisation catalysis
;
_journal_issue                   35
_journal_name_full               'Dalton Transactions'
_journal_page_first              7236
_journal_paper_doi               10.1039/b907034f
_journal_year                    2009
_chemical_formula_moiety         'C25 H47 N3 O Si2 Zn'
_chemical_formula_sum            'C25 H47 N3 O Si2 Zn'
_chemical_formula_weight         527.21
_chemical_name_systematic
;
?
;
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 101.3390(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.2450(4)
_cell_length_b                   11.7949(5)
_cell_length_c                   23.0602(8)
_cell_measurement_reflns_used    9995
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      30.45
_cell_measurement_theta_min      2.45
_cell_volume                     2998.9(2)
_computing_cell_refinement       'SAINT (Siemens, 1995)'
_computing_data_collection       'SMART (Siemens, 1993)'
_computing_data_reduction        'SAINT (Siemens, 1995)'
_computing_molecular_graphics    'ORTEP (Farrugia, 1997)'
_computing_publication_material  'enCIFer (Allen et al., 2004)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-92 (Giacovazzo, 1994)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 'ACTA 50'
_diffrn_measured_fraction_theta_max 0.948
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area detector'
_diffrn_measurement_method       'Omega scans'
_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  0.0337
_diffrn_reflns_av_sigmaI/netI    0.0400
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            30818
_diffrn_reflns_theta_full        'ACTA 50'
_diffrn_reflns_theta_max         30.53
_diffrn_reflns_theta_min         1.80
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.919
_exptl_absorpt_correction_T_max  0.795
_exptl_absorpt_correction_T_min  0.701
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            COLOURLESS
_exptl_crystal_density_diffrn    1.168
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             1136
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.591
_refine_diff_density_min         -0.352
_refine_diff_density_rms         0.071
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.198
_refine_ls_hydrogen_treatment    RIDING
_refine_ls_matrix_type           full
_refine_ls_number_parameters     301
_refine_ls_number_reflns         8688
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.198
_refine_ls_R_factor_all          0.0677
_refine_ls_R_factor_gt           0.0546
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0351P)^2^+2.0169P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1105
_refine_ls_wR_factor_ref         0.1158
_reflns_number_gt                7357
_reflns_number_total             8688
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b907034f.txt
_cod_data_source_block           po8075
_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.

'_exptl_absorpt_correction_type' value 'MULTI-SCAN' changed
to 'multi-scan' 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      P21/N
_cod_database_code               7002120