The importance of C–H⋯N, C–H⋯π and π⋯π interactions in the crystal packing of the isomeric N^1^,N^4^-bis((pyridine-n-yl)methylene)-cyclohexane-1,4-diamines, n = 2, 3 and 4
Lai, Chian Sing; Mohr, Fabian; Tiekink, Edward R. T.; CrystEngComm 8 (2006) 909–915; doi:10.1039/b613603f

data_7203669
_publ_section_title
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 The importance of C--H&#x22EF;N, C--H&#x22EF;\p and \p&#x22EF;\p
 interactions in the crystal packing of the isomeric
 N^1^,N^4^-bis((pyridine-n-yl)methylene)-cyclohexane-1,4-diamines,
 n = 2, 3 and 4 
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_journal_coden_ASTM              CRECF4
_journal_issue                   12
_journal_name_full               CrystEngComm
_journal_page_first              909
_journal_page_last               915
_journal_paper_doi               10.1039/b613603f
_journal_volume                  8
_journal_year                    2006
_chemical_formula_moiety         'C18 H20 N4'
_chemical_formula_sum            'C18 H20 N4'
_chemical_formula_weight         292.38
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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
_cell_angle_beta                 94.702(3)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   11.7026(13)
_cell_length_b                   5.5972(6)
_cell_length_c                   12.3769(14)
_cell_measurement_reflns_used    1114
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.8
_cell_measurement_theta_min      3.3
_cell_volume                     807.98(15)
_computing_cell_refinement       'SAINT (Bruker, 2000)'
_computing_data_collection       'SMART (Bruker, 2000)'
_computing_data_reduction        'SHELXTL (Bruker, 2000)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  'Bruker SHEXLTL (Bruker, 2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1992)'
_diffrn_ambient_temperature      223(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Bruker AXS SMART CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.031
_diffrn_reflns_av_sigmaI/netI    0.043
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            6419
_diffrn_reflns_theta_full        30.0
_diffrn_reflns_theta_max         30.0
_diffrn_reflns_theta_min         1.8
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.665
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS, Bruker, 2000 & Blessing, 1995)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.202
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             312
_exptl_crystal_size_max          0.31
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.31
_refine_diff_density_min         -0.16
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.04
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     100
_refine_ls_number_reflns         2322
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.04
_refine_ls_R_factor_all          0.095
_refine_ls_R_factor_gt           0.058
_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^)+(0.1047P)^2^+0.0272P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.154
_refine_ls_wR_factor_ref         0.190
_reflns_number_gt                1436
_reflns_number_total             2322
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b613603f.txt
_cod_data_source_block           4-isomer
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7203669