Bis(3,5-dimethyl-1H-pyrazolyl)selenide‒a new bidentate bent connector for preparation of 1D and 2D co-ordination polymers.
Seredyuk, Maksym; Haukka, Matti; Fritsky, Igor O.; Kozłowski, Henryk; Krämer, Roland; Pavlenko, Vadim A.; Gütlich, Philipp; Dalton transactions (Cambridge, England : 2003)  (2007) 3183–3194; doi:10.1039/b702574b

data_7005487
_publ_section_title
;
 Bis(3,5-dimethyl-1H-pyrazolyl)selenide--a new bidentate bent connector
 for preparation of 1D and 2D co-ordination polymers.
;
_journal_issue                   29
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3183
_journal_page_last               3194
_journal_paper_doi               10.1039/b702574b
_journal_year                    2007
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C20 H28 N8 Se2 Zn, 2(N O3)'
_chemical_formula_sum            'C20 H28 N10 O6 Se2 Zn'
_chemical_formula_weight         727.81
_chemical_name_common
;
catena-((bis(mu-trans-bis(3,5-dimethyl-1H-
pyrazolyl)selenide)) zinc(ii)) dinitrate
;
_chemical_name_systematic
;
catena-{(bis[mu-trans-bis(3,5-dimethyl-1H-pyrazolyl)selenide])
zinc(II)} dinitrate
;
_space_group_IT_number           120
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'I -4 -2c'
_symmetry_space_group_name_H-M   'I -4 c 2'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.2301(4)
_cell_length_b                   13.2301(4)
_cell_length_c                   15.8544(4)
_cell_measurement_temperature    120(2)
_cell_volume                     2775.08(14)
_computing_cell_refinement       'Denzo/Scalepack (Otwinowski & Minor, 1997)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction        'Denzo/Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'Diamond v.3.1d (Brandenburg, 2006)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR2004 (Burla et al., 2005)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '\f scans and \w scans with \k offset'
_diffrn_radiation_monochromator  'horizontally mounted graphite crystal'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0346
_diffrn_reflns_av_sigmaI/netI    0.0191
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            15520
_diffrn_reflns_theta_full        27.51
_diffrn_reflns_theta_max         27.51
_diffrn_reflns_theta_min         3.08
_exptl_absorpt_coefficient_mu    3.563
_exptl_absorpt_correction_T_max  0.6486
_exptl_absorpt_correction_T_min  0.4337
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Xprep in Shelxtl v.6.14-1 (Sheldrick, 2005)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.742
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1456
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.775
_refine_diff_density_min         -0.501
_refine_diff_density_rms         0.070
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.019(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.121
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     92
_refine_ls_number_reflns         1597
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.121
_refine_ls_R_factor_all          0.0283
_refine_ls_R_factor_gt           0.0242
_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^)+(0.0317P)^2^+2.3536P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0591
_refine_ls_wR_factor_ref         0.0607
_reflns_number_gt                1478
_reflns_number_total             1597
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b702574b.txt
_cod_data_source_block           5
_cod_database_code               7005487