Control of Conformations of Piperazidine-Bridged Bis(phenolato) Groups: Syntheses and Structures of Bimetallic and Monometallic Lanthanide Amides and Their Application in the Polymerization of Lactides
Li, Wenyi; Zhang, Zhongjian; Yao, Yingming; Zhang, Yong; Shen, Qi; Organometallics 31 (2012) 3499–; doi:10.1021/om201164t

data_4079023
_publ_section_title
;
 Control of Conformations of Piperazidine-Bridged Bis(phenolato) Groups:
 Syntheses and Structures of Bimetallic and Monometallic Lanthanide Amides
 and Their Application in the Polymerization of Lactides
;
_journal_issue                   9
_journal_name_full               Organometallics
_journal_page_first              3499
_journal_paper_doi               10.1021/om201164t
_journal_volume                  31
_journal_year                    2012
_chemical_formula_moiety         'C42 H74 N3 Nd O3 Si2, 0.5(C4 H8 O)'
_chemical_formula_sum            'C44 H78 N3 Nd O3.5 Si2'
_chemical_formula_weight         905.51
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      60
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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                   22.5843(10)
_cell_length_b                   15.7763(7)
_cell_length_c                   27.2441(13)
_cell_measurement_reflns_used    33524
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.1
_cell_volume                     9707.0(8)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223(2)
_diffrn_detector_area_resol_mean 14.63
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Rigaku Saturn'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0802
_diffrn_reflns_av_sigmaI/netI    0.0660
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            42612
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         3.09
_exptl_absorpt_coefficient_mu    1.158
_exptl_absorpt_correction_T_max  0.842
_exptl_absorpt_correction_T_min  0.566
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.239
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             3832
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.15
_refine_diff_density_max         1.004
_refine_diff_density_min         -0.921
_refine_diff_density_rms         0.094
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.258
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     484
_refine_ls_number_reflns         8992
_refine_ls_number_restraints     12
_refine_ls_restrained_S_all      1.258
_refine_ls_R_factor_all          0.1035
_refine_ls_R_factor_gt           0.0901
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0513P)^2^+43.5330P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1844
_refine_ls_wR_factor_ref         0.1916
_reflns_number_gt                7959
_reflns_number_total             8992
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om201164t_si_001.cif
_cod_data_source_block           complex12
_cod_original_formula_sum        'C44 H78 N3 Nd O3.50 Si2'
_cod_database_code               4079023