Synthetic and structural experiments on yttrium, cerium and magnesium trimethylsilylmethyls and their reaction products with nitriles; with a note on two cerium beta-diketiminates.
Avent, Anthony G.; Caro, Catherine F.; Hitchcock, Peter B.; Lappert, Michael F.; Li, Zhengning; Wei, Xue-Hong; Dalton transactions (Cambridge, England : 2003)  (2004) 1567–1577; doi:10.1039/b316695n

data_7013959
_publ_section_title
;
 Synthetic and structural experiments on yttrium, cerium and magnesium
 trimethylsilylmethyls and their reaction products with nitriles; with
 a note on two cerium beta-diketiminates.
;
_journal_issue                   10
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1567
_journal_page_last               1577
_journal_paper_doi               10.1039/b316695n
_journal_year                    2004
_chemical_formula_moiety         '(C31 H75 N2 Si6 Y1), 0.5(C6 H12)'
_chemical_formula_sum            'C34 H81 N2 Si6 Y'
_chemical_formula_weight         775.46
_chemical_name_common            '(Y(CH(SiMe3)2)3(NCtBu)2). 1/2(cyclohexane)'
_chemical_name_systematic
;
?
;
_space_group_IT_number           167
_symmetry_cell_setting           rhombohedral
_symmetry_Int_Tables_number      167
_symmetry_space_group_name_Hall  '-R 3 2"c'
_symmetry_space_group_name_H-M   'R -3 c :H'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2004-02-16T09:35:21-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            12
_cell_length_a                   12.4967(4)
_cell_length_b                   12.4967(4)
_cell_length_c                   108.85(4)
_cell_measurement_temperature    173(2)
_cell_volume                     14721(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.954
_diffrn_measured_fraction_theta_max 0.954
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.0391
_diffrn_reflns_av_unetI/netI     0.0533
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       99
_diffrn_reflns_limit_l_min       -99
_diffrn_reflns_number            21353
_diffrn_reflns_theta_full        22.98
_diffrn_reflns_theta_max         22.98
_diffrn_reflns_theta_min         3.78
_exptl_absorpt_coefficient_mu    1.356
_exptl_absorpt_correction_T_max  0.628
_exptl_absorpt_correction_T_min  0.578
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
[c.f. r.h. blessing, acta cryst. (1995), a51, 33-38]
;
_exptl_crystal_density_diffrn    1.05
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             5064
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.319
_refine_diff_density_min         -0.344
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     130
_refine_ls_number_reflns         2187
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.0629
_refine_ls_R_factor_gt           0.0418
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0330P)^2^+47.3809P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0873
_refine_ls_wR_factor_ref         0.0939
_reflns_number_gt                1684
_reflns_number_total             2187
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b316695n.txt
_cod_data_source_block           feb1202
_cod_original_cell_volume        14722(5)
_cod_original_sg_symbol_H-M      R-3c
_cod_database_code               7013959