Synthesis and anticancer activity of silver(i)-N-heterocyclic carbene complexes derived from the natural xanthine products caffeine, theophylline and theobromine.
Mohamed, Heba A.; Lake, Benjamin R. M.; Laing, Thomas; Phillips, Roger M.; Willans, Charlotte E.; Dalton transactions (Cambridge, England : 2003) 44 (2015) 7563–7569; doi:10.1039/c4dt03679d

data_7034632
_publ_section_title
;
 Synthesis and anticancer activity of silver(i)-N-heterocyclic carbene
 complexes derived from the natural xanthine products caffeine,
 theophylline and theobromine.
;
_journal_issue                   16
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7563
_journal_page_last               7569
_journal_paper_doi               10.1039/c4dt03679d
_journal_volume                  44
_journal_year                    2015
_chemical_formula_moiety         'C12 H19 N4 O2, I'
_chemical_formula_sum            'C12 H19 I N4 O2'
_chemical_formula_weight         378.21
_chemical_name_systematic        2c
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2014-12-01 deposited with the CCDC.
2015-03-18 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.244(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.4007(7)
_cell_length_b                   22.7653(11)
_cell_length_c                   7.1881(5)
_cell_measurement_reflns_used    2861
_cell_measurement_temperature    99.98(14)
_cell_measurement_theta_max      29.1730
_cell_measurement_theta_min      3.3490
_cell_volume                     1538.31(17)
_computing_cell_refinement
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CrysAlisPro, Agilent Technologies,
Version 1.171.36.28e (release 10-06-2013 CrysAlis171 .NET)
(compiled Jun 10 2013,11:58:50)
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_computing_data_collection
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CrysAlisPro, Agilent Technologies,
Version 1.171.36.28e (release 10-06-2013 CrysAlis171 .NET)
(compiled Jun 10 2013,11:58:50)
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_computing_data_reduction
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CrysAlisPro, Agilent Technologies,
Version 1.171.36.28e (release 10-06-2013 CrysAlis171 .NET)
(compiled Jun 10 2013,11:58:50)
;
_computing_molecular_graphics    'ORTEP-III Version 1.08 (Farrugia, 2005)'
_computing_publication_material
;
enCIFer: A program for viewing, editing and visualising CIFs.
F. H. Allen, O. Johnson, G. P. Shields, B. R. Smith, M. Towler,
J. Applied Cryst., 37, 331-334, 2004
;
_computing_structure_refinement
;
SHELXS-97 (Sheldrick, G. M.    Acta Cryst. (2008). A64, 112)
XSeed (L.J.Barbour, J.Supramol. Chem., 2003, 1, 189.)
;
_computing_structure_solution
;
SHELXS-97 (Sheldrick, G. M.    Acta Cryst. (2008). A64, 112)
XSeed (L.J.Barbour, J.Supramol. Chem., 2003, 1, 189.)
;
_diffrn_ambient_temperature      99.98(14)
_diffrn_detector_area_resol_mean 5.3095
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'SuperNova (Mo) X-ray Source'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0372
_diffrn_reflns_av_sigmaI/netI    0.0557
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            4777
_diffrn_reflns_theta_full        27.10
_diffrn_reflns_theta_max         27.10
_diffrn_reflns_theta_min         3.35
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.086
_exptl_absorpt_correction_T_max  0.8850
_exptl_absorpt_correction_T_min  0.6684
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.32 (release 02-08-2013 CrysAlis171 .NET)
(compiled Aug  2 2013,16:46:58)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.633
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             752
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.06
_refine_diff_density_max         2.111
_refine_diff_density_min         -1.313
_refine_diff_density_rms         0.206
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.28(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.085
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     159
_refine_ls_number_reflns         2369
_refine_ls_number_restraints     289
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0593
_refine_ls_R_factor_gt           0.0564
_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^)+(0.0720P)^2^+22.8684P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1407
_refine_ls_wR_factor_ref         0.1439
_reflns_number_gt                2249
_reflns_number_total             2369
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4dt03679d2.cif
_cod_data_source_block           Ligand2c
_cod_depositor_comments
'Adding full bibliography for 7034631--7034636.cif.'
_cod_original_sg_symbol_H-M      'C c'
_cod_database_code               7034632