Isomers of 2,2':6',2″-terpyridine and 2,6-dipyrazin-2-ylpyridine with aliphatic substituents: synthesis, coordination chemistry, and catalytic and anticancer activities.
Zhang, Guoqi; Mei, Haiyu; Kanina, Amy; Chocho, Marilyn; Hiyaev, Paulina; Cheng, Shu-Yuan; Neary, Michelle C.; Dalton transactions (Cambridge, England : 2003) 55 (2026) 2855–2867; doi:10.1039/d5dt02824h

data_7720227
_publ_section_title
;
 Isomers of 2,2':6',2&#x2033;-terpyridine and 2,6-dipyrazin-2-ylpyridine
 with aliphatic substituents: synthesis, coordination chemistry, and
 catalytic and anticancer activities.
;
_journal_issue                   7
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2855
_journal_page_last               2867
_journal_paper_doi               10.1039/d5dt02824h
_journal_volume                  55
_journal_year                    2026
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C19 H19 N3'
_chemical_formula_sum            'C19 H19 N3'
_chemical_formula_weight         289.37
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2019/1
_audit_update_record
;
2025-10-22 deposited with the CCDC.	2026-01-09 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 116.170(4)
_cell_angle_gamma                90
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_cell_length_b                   10.9964(8)
_cell_length_c                   18.1432(13)
_cell_measurement_reflns_used    9089
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      32.25
_cell_measurement_theta_min      2.23
_cell_volume                     3109.6(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2019/1 (Sheldrick, 2019)'
_computing_structure_solution    'SHELXT-2014 (Sheldrick 2014)'
_diffrn_ambient_temperature      130(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0570
_diffrn_reflns_av_unetI/netI     0.0470
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            177666
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.985
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         32.325
_diffrn_reflns_theta_min         1.251
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.7463
_exptl_absorpt_correction_T_min  0.7061
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.236
_exptl_crystal_description       block
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.560
_exptl_crystal_size_mid          0.480
_exptl_crystal_size_min          0.440
_refine_diff_density_max         0.678
_refine_diff_density_min         -0.401
_refine_diff_density_rms         0.073
_refine_ls_abs_structure_details
; 
 Refined as an inversion twin. 
;
_refine_ls_abs_structure_Flack   0(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     843
_refine_ls_number_reflns         21847
_refine_ls_number_restraints     337
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.1101
_refine_ls_R_factor_gt           0.0669
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0861P)^2^+2.6277P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1710
_refine_ls_wR_factor_ref         0.2017
_reflns_Friedel_coverage         0.899
_reflns_Friedel_fraction_full    0.999
_reflns_Friedel_fraction_max     0.977
_reflns_number_gt                15383
_reflns_number_total             21847
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5dt02824h2.cif
_cod_data_source_block           gz811d
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7720227
_shelx_shelxl_version_number     2019/1
_shelx_estimated_absorpt_t_min   0.960
_shelx_estimated_absorpt_t_max   0.968
_shelx_res_checksum              78909