Site-selective DNA photocleavage involving unusual photoinitiated tautomerization of chiral tridentate vanadyl(V) complexes derived from N-salicylidene alpha-amino acids.
Chen, Chien-Tien; Lin, Jin-Sheng; Kuo, Jen-Huang; Weng, Shiue-Shien; Cuo, Ting-Shen; Lin, Yi-Wen; Cheng, Chien-Chung; Huang, Yan-Chen; Yu, Jen-Kan; Chou, Pi-Tai; Organic letters 6 (2004) 4471–4474; doi:10.1021/ol048156h

data_1506945
_publ_section_title
;
 Site-selective DNA photocleavage involving unusual photoinitiated
 tautomerization of chiral tridentate vanadyl(V) complexes derived from
 N-salicylidene alpha-amino acids.
;
_journal_issue                   24
_journal_name_full               'Organic letters'
_journal_page_first              4471
_journal_page_last               4474
_journal_paper_doi               10.1021/ol048156h
_journal_volume                  6
_journal_year                    2004
_chemical_formula_sum            'C19 H24 N O6 V'
_chemical_formula_weight         413.33
_space_group_IT_number           18
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2 2ab'
_symmetry_space_group_name_H-M   'P 21 21 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.521(2)
_cell_length_b                   32.527(7)
_cell_length_c                   6.7189(13)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      12
_cell_measurement_theta_min      8
_cell_volume                     2080.8(7)
_computing_cell_refinement       'Enraf-Nonius CAD-4 Sofware'
_computing_data_collection       'Enraf-Nonius CAD-4 Sofware'
_computing_data_reduction        'NRCSDP DATRD2'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Enraf-Nonius CAD-4'
_diffrn_measurement_method       '\q-2/q scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0518
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       42
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2429
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         1.25
_diffrn_standards_decay_%        18
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.509
_exptl_absorpt_correction_T_max  0.886
_exptl_absorpt_correction_T_min  0.863
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            darkred
_exptl_crystal_density_diffrn    1.319
_exptl_crystal_F_000             864
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.193
_refine_diff_density_min         -0.197
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.07(4)
_refine_ls_extinction_coef       0.0012(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_all   1.002
_refine_ls_goodness_of_fit_obs   1.124
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         2429
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.002
_refine_ls_restrained_S_obs      1.124
_refine_ls_R_factor_all          0.0695
_refine_ls_R_factor_obs          0.0379
_refine_ls_shift/esd_max         3.757
_refine_ls_shift/esd_mean        0.015
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0406P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0927
_refine_ls_wR_factor_obs         0.0824
_reflns_number_observed          1615
_reflns_number_total             2429
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ol048156hsi20040913_083401.cif
_cod_data_source_block           ic7262
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0406P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0406P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        2080.7(7)
_cod_original_sg_symbol_H-M      P2(1)2(1)2
_cod_database_code               1506945