Exchange coupling and magnetic blocking in dilanthanide complexes bridged by the multi-electron redox-active ligand 2,3,5,6-tetra(2-pyridyl)pyrazine
Demir, Selvan; Nippe, Michael; Gonzalez, Miguel I.; Long, Jeffrey R.; Chem. Sci. 5 (2014) 4701–; doi:10.1039/C4SC02154A

data_1517445
_publ_section_title
;
 Exchange coupling and magnetic blocking in dilanthanide complexes bridged
 by the multi-electron redox-active ligand
 2,3,5,6-tetra(2-pyridyl)pyrazine
;
_journal_issue                   12
_journal_name_full               'Chem. Sci.'
_journal_page_first              4701
_journal_paper_doi               10.1039/C4SC02154A
_journal_volume                  5
_journal_year                    2014
_chemical_formula_moiety         'C64 H76 Gd2 N6, 4(C4 H8 O), C24 H20 B'
_chemical_formula_sum            'C104 H128 B Gd2 N6 O4'
_chemical_formula_weight         1851.43
_chemical_name_systematic
;
 ? 
;
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2013-05-26
_audit_creation_method
;
  Olex2 1.2
  (compiled Apr 23 2013 17:59:47, GUI svn.r4466)
;
_cell_angle_alpha                115.277(2)
_cell_angle_beta                 98.616(2)
_cell_angle_gamma                102.884(2)
_cell_formula_units_Z            2
_cell_length_a                   16.4717(6)
_cell_length_b                   17.8945(7)
_cell_length_c                   18.2112(7)
_cell_measurement_reflns_used    9763
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.3074
_cell_measurement_theta_min      2.3351
_cell_volume                     4545.2(3)
_computing_cell_refinement       'Bruker APEX2 v. 2009.1'
_computing_data_collection       'Bruker APEX2 v. 2009.1'
_computing_data_reduction        'Bruker APEX2 v. 2009.1'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0831
_diffrn_reflns_av_unetI/netI     0.0840
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            88606
_diffrn_reflns_theta_full        25.42
_diffrn_reflns_theta_max         25.42
_diffrn_reflns_theta_min         1.32
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    1.502
_exptl_absorpt_correction_T_max  0.8893
_exptl_absorpt_correction_T_min  0.7533
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.353
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1918
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         1.343
_refine_diff_density_min         -0.809
_refine_diff_density_rms         0.133
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1074
_refine_ls_number_reflns         16634
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0757
_refine_ls_R_factor_gt           0.0423
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0272P)^2^+6.0673P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0745
_refine_ls_wR_factor_ref         0.0850
_reflns_number_gt                11925
_reflns_number_total             16634
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4sc02154a3.cif
_cod_data_source_block           compound1
_cod_depositor_comments
'Adding full bibliography for 1517443--1517446.cif.'
_cod_database_code               1517445
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Secondary CH2 refined with riding coordinates:
 C1S(H1SA,H1SB), C2S(H2SA,H2SB), C3S(H3SA,H3SB), C4S(H4SA,H4SB), C5S(H5SA,
 H5SB), C6S(H6SA,H6SB), C7S(H7SA,H7SB), C8S(H8SA,H8SB), C9S(H9SA,H9SB),
 C10S(H10A,H10B), C11S(H11A,H11B), C12S(H12A,H12B), C13S(H13A,H13B), C14S(H14A,
 H14B), C15S(H15A,H15B), C16S(H16A,H16B)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C11(H11), C12(H12), C13(H13), C14(H14),
 C15(H15), C16(H16), C17(H17), C18(H18), C20(H20), C21(H21), C22(H22), C23(H23),
  C66(H66), C67(H67), C68(H68), C69(H69), C70(H70), C72(H72), C73(H73),
 C74(H74), C75(H75), C76(H76), C78(H78), C79(H79), C80(H80), C81(H81), C82(H82),
  C84(H84), C85(H85), C86(H86), C87(H87), C88(H88)
2.c Idealised Me refined as rotating group:
 C30(H30A,H30B,H30C), C31(H31A,H31B,H31C), C32(H32A,H32B,H32C), C33(H33A,H33B,
 H33C), C34(H34A,H34B,H34C), C40(H40A,H40B,H40C), C41(H41A,H41B,H41C), C42(H42A,
 H42B,H42C), C43(H43A,H43B,H43C), C44(H44A,H44B,H44C), C50(H50A,H50B,H50C),
 C51(H51A,H51B,H51C), C52(H52A,H52B,H52C), C53(H53A,H53B,H53C), C54(H54A,H54B,
 H54C), C60(H60A,H60B,H60C), C61(H61A,H61B,H61C), C62(H62A,H62B,H62C), C63(H63A,
 H63B,H63C), C64(H64A,H64B,H64C)
;