Alkaline earth metal amide complexes containing a cyclen-derived (NNNN) macrocyclic ligand: synthesis, structure, and ring-opening polymerization activity towards lactide monomers
Buffet, Jean-Charles; Davin, Julien P.; Spaniol, Thomas P.; Okuda, Jun; New Journal of Chemistry 35 (2011) 2253–; doi:10.1039/c1nj20259f

data_7052742
_publ_section_title
;
 Alkaline earth metal amide complexes containing a cyclen-derived
 (NNNN) macrocyclic ligand: synthesis, structure, and ring-opening
 polymerization activity towards lactide monomers
;
_journal_issue                   10
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              2253
_journal_paper_doi               10.1039/c1nj20259f
_journal_volume                  35
_journal_year                    2011
_chemical_formula_moiety         'C17 H43 Ca N5 Si2'
_chemical_formula_sum            'C17 H43 Ca N5 Si2'
_chemical_formula_weight         413.82
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.8305(10)
_cell_length_b                   14.9065(9)
_cell_length_c                   21.3107(13)
_cell_measurement_reflns_used    4542
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      22.26
_cell_measurement_theta_min      2.30
_cell_volume                     5028.8(5)
_computing_cell_refinement       'Bruker SMART (2001)'
_computing_data_collection       'Bruker SMART (2001)'
_computing_data_reduction        'Bruker SAINT+ (1999)'
_computing_molecular_graphics    'ORTEP-III (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-92 (Altomare 1992)'
_diffrn_ambient_temperature      130(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'APEX Area Detector'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  'multilayer optics'
_diffrn_radiation_source         'INCOATEC microsource'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1046
_diffrn_reflns_av_sigmaI/netI    0.0691
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            66018
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.91
_exptl_absorpt_coefficient_mu    0.355
_exptl_absorpt_correction_T_max  0.9421
_exptl_absorpt_correction_T_min  0.9072
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Platon Mulabs'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.093
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1824
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.17
_refine_diff_density_max         0.431
_refine_diff_density_min         -0.191
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.860
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     264
_refine_ls_number_reflns         6261
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.860
_refine_ls_R_factor_all          0.0591
_refine_ls_R_factor_gt           0.0358
_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^)+(0.0276P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0722
_refine_ls_wR_factor_ref         0.0778
_reflns_number_gt                4249
_reflns_number_total             6261
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1nj20259f.txt
_cod_data_source_block           2
_cod_database_code               7052742