Nature and strength of C-HO interactions involving formyl hydrogen atoms: computational and experimental studies of small aldehydes.
Thakur, Tejender S.; Kirchner, Michael T.; Bläser, Dieter; Boese, Roland; Desiraju, Gautam R.; Physical chemistry chemical physics : PCCP 13 (2011) 14076–14091; doi:10.1039/c0cp02236e

data_7206161
_publ_section_title
;
 Nature and strength of C-HO interactions involving formyl hydrogen
 atoms: computational and experimental studies of small aldehydes.
;
_journal_issue                   31
_journal_name_full               'Physical chemistry chemical physics : PCCP'
_journal_page_first              14076
_journal_page_last               14091
_journal_paper_doi               10.1039/c0cp02236e
_journal_volume                  13
_journal_year                    2011
_chemical_absolute_configuration unk
_chemical_formula_sum            'C H2 O'
_chemical_formula_weight         30.03
_chemical_name_common            formaldehyde
_chemical_name_systematic
;
formaldehyde
;
_space_group_IT_number           114
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P -4 2n'
_symmetry_space_group_name_H-M   'P -4 21 c'
_atom_sites_solution_hydrogens   geom
_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            8
_cell_length_a                   8.7411(10)
_cell_length_b                   8.7411(10)
_cell_length_c                   4.4740(9)
_cell_measurement_reflns_used    542
_cell_measurement_temperature    148(2)
_cell_measurement_theta_max      27.04
_cell_measurement_theta_min      3.29
_cell_volume                     341.84(9)
_computing_cell_refinement       'BRUKER AXS SMART APEX 2 Vers. 3.0-2009'
_computing_data_collection       'BRUKER AXS SMART APEX 2 Vers. 3.0-2009'
_computing_data_reduction        'BRUKER AXS SMART APEX 2 Vers. 3.0-2009'
_computing_molecular_graphics    'BRUKER AXS SHELXTL (c) 2008 / Vers. 2008/4'
_computing_publication_material  'BRUKER AXS SHELXTL (c) 2008 / Vers. 2008/4'
_computing_structure_refinement  'BRUKER AXS SHELXTL (c) 2008 / Vers. 2008/4'
_computing_structure_solution    'BRUKER AXS SMART APEX 2 Vers. 3.0-2009'
_diffrn_ambient_temperature      148(2)
_diffrn_detector_area_resol_mean 512
_diffrn_measured_fraction_theta_full 0.770
_diffrn_measured_fraction_theta_max 0.770
_diffrn_measurement_device_type
;
Siemens SMART three axis goniometer with APEX II area detector system
;
_diffrn_measurement_method
;
Data collection strategy APEX 2 / COSMO
with chi = 0
;
_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  0.0637
_diffrn_reflns_av_sigmaI/netI    0.0438
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       3
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            1492
_diffrn_reflns_theta_full        31.70
_diffrn_reflns_theta_max         31.70
_diffrn_reflns_theta_min         3.30
_exptl_absorpt_coefficient_mu    0.106
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.167
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cylindric
_exptl_crystal_F_000             128
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.066
_refine_diff_density_min         -0.057
_refine_diff_density_rms         0.016
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.1(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.953
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     27
_refine_ls_number_reflns         436
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.953
_refine_ls_R_factor_all          0.0338
_refine_ls_R_factor_gt           0.0252
_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^)+(0.0235P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0599
_refine_ls_wR_factor_ref         0.0620
_reflns_number_gt                352
_reflns_number_total             436
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0cp02236e.txt
_cod_data_source_block           formaldehyd_0m
_cod_original_sg_symbol_H-M      P-421c
_cod_database_code               7206161