Pyridyl 'ring-flipping' in the dimers [Me2E(2-py)]2 (E=B, Al, Ga; 2-py=2-pyridyl).
García, Felipe; Hopkins, Alexander D; Kowenicki, Richard A; McPartlin, Mary; Silvia, Jared S; Rawson, Jeremy M; Rogers, Michael C; Wright, Dominic S; Chemical communications (Cambridge, England)  (2007) 586–588; doi:10.1039/b613748b

data_7101691
_publ_section_title
;
 Pyridyl 'ring-flipping' in the dimers [Me2E(2-py)]2 (E=B, Al, Ga;
 2-py=2-pyridyl).
;
_journal_issue                   6
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              586
_journal_page_last               588
_journal_paper_doi               10.1039/b613748b
_journal_year                    2007
_chemical_formula_moiety         'C14 H20 Al2 N2'
_chemical_formula_sum            'C14 H20 Al2 N2'
_chemical_formula_weight         270.28
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 112.26(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.027(3)
_cell_length_b                   16.564(3)
_cell_length_c                   14.656(3)
_cell_measurement_reflns_used    11466
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     3151.5(11)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius B.V. 1998)'
_computing_data_reduction
;
HKL Denzo and Scalepack (Otwinowski & Minor 1997)
;
_computing_publication_material  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_solution    'SIR-92 (Altomare et al. 1994)'
_diffrn_ambient_temperature      180(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'Thin slice \w and \f scans'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0479
_diffrn_reflns_av_sigmaI/netI    0.0477
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            12895
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         3.82
_exptl_absorpt_coefficient_mu    0.170
_exptl_absorpt_correction_T_max  0.994
_exptl_absorpt_correction_T_min  0.826
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements
Sortav (Blessing 1995)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.139
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rods
_exptl_crystal_F_000             1152
_exptl_crystal_size_max          0.81
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.329
_refine_diff_density_min         -0.235
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     165
_refine_ls_number_reflns         3605
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0846
_refine_ls_R_factor_gt           0.0492
_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^)+(0.0590P)^2^+3.0330P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1208
_refine_ls_wR_factor_ref         0.1404
_reflns_number_gt                2441
_reflns_number_total             3605
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b613748b.txt
_cod_data_source_block           dw0451
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7101691