Hafnium carbamates and ureates: new class of precursors for low-temperature growth of HfO2 thin films.
Pothiraja, Ramasamy; Milanov, Andrian P; Barreca, Davide; Gasparotto, Alberto; Becker, Hans-Werner; Winter, Manuela; Fischer, Roland A; Devi, Anjana; Chemical communications (Cambridge, England) 34 (2009) 1978–1980; doi:10.1039/b821128k

data_7104312
_publ_section_title
;
 Hafnium carbamates and ureates: new class of precursors for
 low-temperature growth of HfO2 thin films.
;
_journal_issue                   15
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              1978
_journal_page_last               1980
_journal_paper_doi               10.1039/b821128k
_journal_volume                  34
_journal_year                    2009
_chemical_formula_sum            'C28 H56 Hf N4 O8'
_chemical_formula_weight         755.26
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                   18.7586(2)
_cell_length_b                   18.7004(2)
_cell_length_c                   20.4731(2)
_cell_measurement_reflns_used    3834
_cell_measurement_temperature    111(2)
_cell_measurement_theta_max      27.499
_cell_measurement_theta_min      2.618
_cell_volume                     7181.83(13)
_computing_cell_refinement       'CrysAlis RED 171.32.24, Oxford Diffraction'
_computing_data_collection       'CrysAlis CCD 171.32.24, Oxford Diffraction'
_computing_data_reduction        'CrysAlis RED 171.32.24, Oxford Diffraction'
_computing_molecular_graphics    SHELXL-97
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      111(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Sapphire2-CCD, Oxford Diffraction'
_diffrn_measurement_method       '887 images at 1.0 deg. in \w and 15 sec.'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0391
_diffrn_reflns_av_sigmaI/netI    0.0223
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            89956
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.08
_exptl_absorpt_coefficient_mu    2.951
_exptl_absorpt_correction_T_max  0.5257
_exptl_absorpt_correction_T_min  0.3775
_exptl_absorpt_correction_type   'numeric analytical'
_exptl_absorpt_process_details   'Gaussian face-indexed'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.397
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             3104
_exptl_crystal_size_max          0.41
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.25
_refine_diff_density_max         3.273
_refine_diff_density_min         -1.581
_refine_diff_density_rms         0.125
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.301
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     386
_refine_ls_number_reflns         6318
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.301
_refine_ls_R_factor_all          0.0621
_refine_ls_R_factor_gt           0.0299
_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^)+(0.0132P)^2^+26.0034P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0534
_refine_ls_wR_factor_ref         0.0686
_reflns_number_gt                4552
_reflns_number_total             6318
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b821128k.txt
_cod_data_source_block           cvd271
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7104312