# Supplementary Material (ESI) for Dalton Transactions # This journal is (c) The Royal Society of Chemistry 2010 data_global _journal_name_full 'Dalton Trans.' _journal_coden_Cambridge 0222 _publ_contact_author_name 'Bohumil Stibr' _publ_contact_author_email STIBR@IIC.CAS.CZ _publ_section_title ; Tautomeric Conversions in the C-Substituted t-BuNH2-8.9-R,R'-nido-7,8,9-C3B8H8 (R,R' ? H,H; MeH; Me,Me; Ph,H and Ph,Ph) tricarbollide series. Absolute tautomerism and effect of substituents on tautomeric equilibria between neutral and zwitterionic forms ; loop_ _publ_author_name 'Bohumil Stibr' 'Mario Bakardjiev' 'Ivana Cisarova' 'Josef Holub' # Attachment 'N2b.cif' data_hol427-2-rez _database_code_depnum_ccdc_archive 'CCDC 753108' #TrackingRef 'N2b.cif' _audit_creation_method SHELXL-97 _chemical_name_systematic ; ? ; _chemical_name_common ? _chemical_melting_point ? _chemical_formula_moiety 'C8 H23 B8 N' _chemical_formula_sum 'C8 H23 B8 N' _chemical_formula_weight 219.75 _chemical_compound_source 'synthesized by the authors' loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' B B 0.0013 0.0007 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _symmetry_cell_setting monoclinic _symmetry_space_group_name_H-M 'P 21/n' _symmetry_space_group_name_Hall '-P 2yn' loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, y+1/2, -z+1/2' '-x, -y, -z' 'x-1/2, -y-1/2, z-1/2' _cell_length_a 9.9813(2) _cell_length_b 11.5093(2) _cell_length_c 12.7934(2) _cell_angle_alpha 90.00 _cell_angle_beta 111.6510(11) _cell_angle_gamma 90.00 _cell_volume 1365.99(4) _cell_formula_units_Z 4 _cell_measurement_temperature 150(2) _cell_measurement_reflns_used 3266 _cell_measurement_theta_min 1 _cell_measurement_theta_max 27.5 _exptl_crystal_description plate _exptl_crystal_colour colourless _exptl_crystal_size_max 0.51 _exptl_crystal_size_mid 0.25 _exptl_crystal_size_min 0.075 _exptl_crystal_density_meas ? _exptl_crystal_density_diffrn 1.069 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 472 _exptl_absorpt_coefficient_mu 0.052 _exptl_absorpt_correction_type none _exptl_absorpt_correction_T_min ? _exptl_absorpt_correction_T_max ? _exptl_absorpt_process_details ? _exptl_special_details ; ? ; _diffrn_ambient_temperature 150(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device_type 'Nonius KappaCCD area detector' _diffrn_measurement_method '\f and \w scans to fill the Ewald sphere' _diffrn_detector_area_resol_mean 9.091 _diffrn_standards_number 0 _diffrn_standards_interval_count ? _diffrn_standards_interval_time ? _diffrn_standards_decay_% ? _diffrn_reflns_number 24777 _diffrn_reflns_av_R_equivalents 0.030 _diffrn_reflns_av_sigmaI/netI 0.0201 _diffrn_reflns_limit_h_min -12 _diffrn_reflns_limit_h_max 12 _diffrn_reflns_limit_k_min -14 _diffrn_reflns_limit_k_max 14 _diffrn_reflns_limit_l_min -16 _diffrn_reflns_limit_l_max 16 _diffrn_reflns_theta_min 2.23 _diffrn_reflns_theta_max 27.47 _reflns_number_total 3120 _reflns_number_gt 2746 _reflns_threshold_expression I>2\s(I) _computing_data_collection 'COLLECT (Hooft, 1998) and DENZO (Otwinowski & Minor, 1997)' _computing_cell_refinement 'COLLECT and DENZO' _computing_data_reduction 'COLLECT and DENZO' _computing_structure_solution 'SIR97 (Altomare et al., 1999)' _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics ? _computing_publication_material ? _refine_special_details ; Refinement of F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ; _refine_ls_structure_factor_coef Fsqd _refine_ls_matrix_type full _refine_ls_weighting_scheme calc _refine_ls_weighting_details 'calc w=1/[\s^2^(Fo^2^)+(0.0630P)^2^+0.2489P] where P=(Fo^2^+2Fc^2^)/3' _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _atom_sites_solution_hydrogens difmap _refine_ls_hydrogen_treatment mixed _refine_ls_extinction_method none _refine_ls_extinction_coef ? _refine_ls_number_reflns 3120 _refine_ls_number_parameters 202 _refine_ls_number_restraints 0 _refine_ls_R_factor_all 0.0442 _refine_ls_R_factor_gt 0.0384 _refine_ls_wR_factor_ref 0.1100 _refine_ls_wR_factor_gt 0.1051 _refine_ls_goodness_of_fit_ref 1.042 _refine_ls_restrained_S_all 1.042 _refine_ls_shift/su_max 0.001 _refine_ls_shift/su_mean 0.000 loop_ _atom_site_label _atom_site_type_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_adp_type _atom_site_occupancy _atom_site_symmetry_multiplicity _atom_site_calc_flag _atom_site_refinement_flags _atom_site_disorder_assembly _atom_site_disorder_group B1 B 0.73584(12) 0.31364(11) 0.57272(9) 0.0298(3) Uani 1 1 d . . . B2 B 0.84310(11) 0.20789(10) 0.53912(9) 0.0239(2) Uani 1 1 d . . . B3 B 0.76704(11) 0.17510(11) 0.63966(9) 0.0281(2) Uani 1 1 d . . . B4 B 0.77411(12) 0.30169(11) 0.71799(10) 0.0302(3) Uani 1 1 d . . . B5 B 0.85832(13) 0.41434(10) 0.66955(10) 0.0299(2) Uani 1 1 d . . . B6 B 0.89579(12) 0.35450(10) 0.55459(9) 0.0258(2) Uani 1 1 d . . . C7 C 1.01803(9) 0.24740(8) 0.61415(7) 0.02004(19) Uani 1 1 d . . . C8 C 0.95141(9) 0.15494(8) 0.67011(7) 0.0221(2) Uani 1 1 d . . . C9 C 0.90510(10) 0.20053(9) 0.76341(8) 0.0256(2) Uani 1 1 d . . . B10 B 0.96137(12) 0.33579(11) 0.79509(9) 0.0270(2) Uani 1 1 d . . . B11 B 1.03939(12) 0.37011(9) 0.68921(9) 0.0244(2) Uani 1 1 d . . . N1 N 1.11060(8) 0.20246(7) 0.56131(7) 0.02370(19) Uani 1 1 d . . . C10 C 1.00748(11) 0.03202(9) 0.68095(9) 0.0315(2) Uani 1 1 d . . . H10A H 1.1016 0.0286 0.7391 0.047 Uiso 1 1 calc R . . H10B H 1.0132 0.0079 0.6109 0.047 Uiso 1 1 calc R . . H10C H 0.9433 -0.0186 0.6997 0.047 Uiso 1 1 calc R . . C11 C 1.26873(10) 0.22260(8) 0.60359(8) 0.0234(2) Uani 1 1 d . . . C12 C 1.30427(12) 0.33753(10) 0.55952(9) 0.0347(3) Uani 1 1 d . . . H12A H 1.2643 0.3373 0.4788 0.052 Uiso 1 1 calc R . . H12B H 1.4070 0.3467 0.5850 0.052 Uiso 1 1 calc R . . H12C H 1.2639 0.4007 0.5871 0.052 Uiso 1 1 calc R . . C13 C 1.32923(11) 0.12201(10) 0.55659(9) 0.0352(3) Uani 1 1 d . . . H13A H 1.3114 0.0501 0.5872 0.053 Uiso 1 1 calc R . . H13B H 1.4312 0.1323 0.5769 0.053 Uiso 1 1 calc R . . H13C H 1.2832 0.1205 0.4762 0.053 Uiso 1 1 calc R . . C14 C 1.33452(11) 0.21931(10) 0.73182(8) 0.0304(2) Uani 1 1 d . . . H14A H 1.3056 0.2873 0.7616 0.046 Uiso 1 1 calc R . . H14B H 1.4377 0.2175 0.7561 0.046 Uiso 1 1 calc R . . H14C H 1.3016 0.1511 0.7584 0.046 Uiso 1 1 calc R . . H1 H 0.6290(16) 0.3400(12) 0.5117(12) 0.046(4) Uiso 1 1 d . . . H1A H 1.0708(14) 0.2147(11) 0.4875(12) 0.039(3) Uiso 1 1 d . . . H2 H 0.8226(13) 0.1553(11) 0.4620(10) 0.031(3) Uiso 1 1 d . . . H3 H 0.6964(14) 0.1025(11) 0.6304(10) 0.036(3) Uiso 1 1 d . . . H4 H 0.7007(15) 0.3131(11) 0.7638(11) 0.042(4) Uiso 1 1 d . . . H5 H 0.8304(14) 0.5057(12) 0.6709(11) 0.043(4) Uiso 1 1 d . . . H6 H 0.9108(14) 0.4024(11) 0.4876(11) 0.039(3) Uiso 1 1 d . . . H9 H 0.9057(13) 0.1447(11) 0.8198(10) 0.031(3) Uiso 1 1 d . . . H10 H 0.9854(14) 0.3740(11) 0.8778(11) 0.038(3) Uiso 1 1 d . . . H101 H 1.0774(14) 0.3221(11) 0.7840(10) 0.036(3) Uiso 1 1 d . . . H11 H 1.1214(13) 0.4371(11) 0.6935(10) 0.032(3) Uiso 1 1 d . . . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_23 _atom_site_aniso_U_13 _atom_site_aniso_U_12 B1 0.0218(5) 0.0404(6) 0.0245(5) -0.0003(5) 0.0052(4) 0.0079(4) B2 0.0190(5) 0.0302(6) 0.0208(5) -0.0010(4) 0.0053(4) -0.0002(4) B3 0.0186(5) 0.0400(6) 0.0262(5) -0.0013(4) 0.0087(4) -0.0023(4) B4 0.0219(5) 0.0436(7) 0.0261(5) -0.0032(5) 0.0101(4) 0.0049(4) B5 0.0311(6) 0.0304(6) 0.0279(5) -0.0017(4) 0.0106(4) 0.0087(4) B6 0.0284(5) 0.0257(5) 0.0223(5) 0.0025(4) 0.0083(4) 0.0050(4) C7 0.0195(4) 0.0213(4) 0.0198(4) -0.0001(3) 0.0078(3) -0.0007(3) C8 0.0184(4) 0.0252(5) 0.0221(4) 0.0017(3) 0.0069(3) -0.0014(3) C9 0.0215(4) 0.0350(5) 0.0212(4) 0.0025(4) 0.0090(4) -0.0007(4) B10 0.0242(5) 0.0358(6) 0.0219(5) -0.0034(4) 0.0095(4) 0.0012(4) B11 0.0273(5) 0.0244(5) 0.0223(5) -0.0030(4) 0.0099(4) -0.0010(4) N1 0.0205(4) 0.0304(4) 0.0220(4) -0.0049(3) 0.0099(3) -0.0020(3) C10 0.0313(5) 0.0241(5) 0.0396(6) 0.0054(4) 0.0135(4) 0.0001(4) C11 0.0192(4) 0.0288(5) 0.0240(5) 0.0001(3) 0.0100(3) -0.0009(3) C12 0.0336(5) 0.0372(6) 0.0364(6) 0.0044(4) 0.0165(5) -0.0071(4) C13 0.0271(5) 0.0430(6) 0.0377(6) -0.0068(5) 0.0148(4) 0.0043(4) C14 0.0251(5) 0.0389(6) 0.0254(5) 0.0007(4) 0.0074(4) 0.0000(4) _geom_special_details ; All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. ; loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_distance _geom_bond_site_symmetry_2 _geom_bond_publ_flag B1 B4 1.7593(16) . ? B1 B6 1.7597(16) . ? B1 B2 1.7753(16) . ? B1 B3 1.7822(18) . ? B1 B5 1.8041(17) . ? B1 H1 1.107(14) . ? B2 C7 1.7147(13) . ? B2 C8 1.7354(13) . ? B2 B6 1.7567(16) . ? B2 B3 1.7590(15) . ? B2 H2 1.111(12) . ? B3 C9 1.6974(14) . ? B3 C8 1.7501(14) . ? B3 B4 1.7549(17) . ? B3 H3 1.071(13) . ? B4 C9 1.6858(15) . ? B4 B5 1.7765(18) . ? B4 B10 1.8056(16) . ? B4 H4 1.101(14) . ? B5 B6 1.7841(15) . ? B5 B10 1.7989(16) . ? B5 B11 1.8037(16) . ? B5 H5 1.089(14) . ? B6 C7 1.7037(14) . ? B6 B11 1.7976(15) . ? B6 H6 1.075(13) . ? C7 N1 1.4280(11) . ? C7 C8 1.5616(12) . ? C7 B11 1.6766(14) . ? C8 C10 1.5088(13) . ? C8 C9 1.5234(13) . ? C9 B10 1.6539(16) . ? C9 H9 0.965(12) . ? B10 B11 1.8374(15) . ? B10 H10 1.088(13) . ? B10 H101 1.228(13) . ? B11 H101 1.257(12) . ? B11 H11 1.111(12) . ? N1 C11 1.4858(11) . ? N1 H1A 0.890(14) . ? C10 H10A 0.9600 . ? C10 H10B 0.9600 . ? C10 H10C 0.9600 . ? C11 C14 1.5261(13) . ? C11 C13 1.5279(14) . ? C11 C12 1.5300(14) . ? C12 H12A 0.9600 . ? C12 H12B 0.9600 . ? C12 H12C 0.9600 . ? C13 H13A 0.9600 . ? C13 H13B 0.9600 . ? C13 H13C 0.9600 . ? C14 H14A 0.9600 . ? C14 H14B 0.9600 . ? C14 H14C 0.9600 . ? loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle_publ_flag B4 B1 B6 107.83(8) . . ? B4 B1 B2 106.67(8) . . ? B6 B1 B2 59.59(6) . . ? B4 B1 B3 59.40(7) . . ? B6 B1 B3 107.23(7) . . ? B2 B1 B3 59.27(6) . . ? B4 B1 B5 59.79(7) . . ? B6 B1 B5 60.07(6) . . ? B2 B1 B5 106.88(7) . . ? B3 B1 B5 106.91(8) . . ? B4 B1 H1 122.9(7) . . ? B6 B1 H1 121.2(7) . . ? B2 B1 H1 121.8(7) . . ? B3 B1 H1 122.5(8) . . ? B5 B1 H1 122.7(7) . . ? C7 B2 C8 53.82(5) . . ? C7 B2 B6 58.77(6) . . ? C8 B2 B6 100.05(7) . . ? C7 B2 B3 105.82(7) . . ? C8 B2 B3 60.11(6) . . ? B6 B2 B3 108.41(8) . . ? C7 B2 B1 105.25(7) . . ? C8 B2 B1 102.91(7) . . ? B6 B2 B1 59.76(6) . . ? B3 B2 B1 60.56(7) . . ? C7 B2 H2 117.2(6) . . ? C8 B2 H2 120.8(6) . . ? B6 B2 H2 125.0(6) . . ? B3 B2 H2 123.0(6) . . ? B1 B2 H2 131.2(6) . . ? C9 B3 C8 52.42(5) . . ? C9 B3 B4 58.43(6) . . ? C8 B3 B4 99.53(7) . . ? C9 B3 B2 102.95(7) . . ? C8 B3 B2 59.28(6) . . ? B4 B3 B2 107.59(8) . . ? C9 B3 B1 103.40(8) . . ? C8 B3 B1 102.03(7) . . ? B4 B3 B1 59.65(7) . . ? B2 B3 B1 60.17(6) . . ? C9 B3 H3 120.8(7) . . ? C8 B3 H3 121.1(7) . . ? B4 B3 H3 126.6(7) . . ? B2 B3 H3 122.1(7) . . ? B1 B3 H3 130.8(7) . . ? C9 B4 B3 59.08(6) . . ? C9 B4 B1 104.87(8) . . ? B3 B4 B1 60.95(7) . . ? C9 B4 B5 102.57(8) . . ? B3 B4 B5 109.34(8) . . ? B1 B4 B5 61.36(7) . . ? C9 B4 B10 56.42(6) . . ? B3 B4 B10 107.93(8) . . ? B1 B4 B10 109.73(8) . . ? B5 B4 B10 60.28(7) . . ? C9 B4 H4 118.8(7) . . ? B3 B4 H4 120.5(7) . . ? B1 B4 H4 128.7(7) . . ? B5 B4 H4 126.3(7) . . ? B10 B4 H4 116.2(7) . . ? B4 B5 B6 106.01(8) . . ? B4 B5 B10 60.66(7) . . ? B6 B5 B10 108.50(8) . . ? B4 B5 B11 108.91(8) . . ? B6 B5 B11 60.13(6) . . ? B10 B5 B11 61.33(6) . . ? B4 B5 B1 58.85(7) . . ? B6 B5 B1 58.73(6) . . ? B10 B5 B1 108.04(8) . . ? B11 B5 B1 107.74(7) . . ? B4 B5 H5 122.8(7) . . ? B6 B5 H5 121.2(7) . . ? B10 B5 H5 122.5(7) . . ? B11 B5 H5 121.3(7) . . ? B1 B5 H5 121.2(7) . . ? C7 B6 B2 59.39(6) . . ? C7 B6 B1 106.41(8) . . ? B2 B6 B1 60.64(6) . . ? C7 B6 B5 104.12(7) . . ? B2 B6 B5 108.58(8) . . ? B1 B6 B5 61.20(7) . . ? C7 B6 B11 57.14(6) . . ? B2 B6 B11 107.68(7) . . ? B1 B6 B11 109.99(8) . . ? B5 B6 B11 60.47(6) . . ? C7 B6 H6 116.1(7) . . ? B2 B6 H6 121.8(7) . . ? B1 B6 H6 130.0(7) . . ? B5 B6 H6 126.3(7) . . ? B11 B6 H6 114.6(7) . . ? N1 C7 C8 115.44(7) . . ? N1 C7 B11 127.48(8) . . ? C8 C7 B11 107.29(7) . . ? N1 C7 B6 122.14(7) . . ? C8 C7 B6 110.01(7) . . ? B11 C7 B6 64.25(6) . . ? N1 C7 B2 110.00(7) . . ? C8 C7 B2 63.77(6) . . ? B11 C7 B2 115.60(7) . . ? B6 C7 B2 61.84(6) . . ? C10 C8 C9 117.42(8) . . ? C10 C8 C7 118.35(8) . . ? C9 C8 C7 115.35(8) . . ? C10 C8 B2 119.72(8) . . ? C9 C8 B2 112.00(7) . . ? C7 C8 B2 62.41(6) . . ? C10 C8 B3 117.95(8) . . ? C9 C8 B3 62.01(6) . . ? C7 C8 B3 113.47(7) . . ? B2 C8 B3 60.61(6) . . ? C8 C9 B10 110.03(8) . . ? C8 C9 B4 112.88(8) . . ? B10 C9 B4 65.45(7) . . ? C8 C9 B3 65.57(6) . . ? B10 C9 B3 118.45(8) . . ? B4 C9 B3 62.49(7) . . ? C8 C9 H9 115.9(7) . . ? B10 C9 H9 122.4(7) . . ? B4 C9 H9 120.5(7) . . ? B3 C9 H9 111.2(7) . . ? C9 B10 B5 102.92(8) . . ? C9 B10 B4 58.13(6) . . ? B5 B10 B4 59.06(7) . . ? C9 B10 B11 102.69(7) . . ? B5 B10 B11 59.46(6) . . ? B4 B10 B11 106.19(7) . . ? C9 B10 H10 123.5(7) . . ? B5 B10 H10 120.9(7) . . ? B4 B10 H10 115.5(7) . . ? B11 B10 H10 129.0(7) . . ? C9 B10 H101 95.8(6) . . ? B5 B10 H101 102.4(6) . . ? B4 B10 H101 137.7(6) . . ? B11 B10 H101 42.9(6) . . ? H10 B10 H101 106.6(9) . . ? C7 B11 B6 58.61(6) . . ? C7 B11 B5 104.40(7) . . ? B6 B11 B5 59.39(6) . . ? C7 B11 B10 104.02(7) . . ? B6 B11 B10 106.25(7) . . ? B5 B11 B10 59.21(6) . . ? C7 B11 H101 96.4(6) . . ? B6 B11 H101 136.9(6) . . ? B5 B11 H101 100.9(6) . . ? B10 B11 H101 41.7(6) . . ? C7 B11 H11 123.3(6) . . ? B6 B11 H11 115.4(6) . . ? B5 B11 H11 119.5(6) . . ? B10 B11 H11 128.1(6) . . ? H101 B11 H11 107.6(9) . . ? C7 N1 C11 123.85(7) . . ? C7 N1 H1A 109.3(8) . . ? C11 N1 H1A 111.1(9) . . ? C8 C10 H10A 109.5 . . ? C8 C10 H10B 109.5 . . ? H10A C10 H10B 109.5 . . ? C8 C10 H10C 109.5 . . ? H10A C10 H10C 109.5 . . ? H10B C10 H10C 109.5 . . ? N1 C11 C14 111.44(7) . . ? N1 C11 C13 105.04(8) . . ? C14 C11 C13 109.17(8) . . ? N1 C11 C12 111.12(8) . . ? C14 C11 C12 110.56(8) . . ? C13 C11 C12 109.33(8) . . ? C11 C12 H12A 109.5 . . ? C11 C12 H12B 109.5 . . ? H12A C12 H12B 109.5 . . ? C11 C12 H12C 109.5 . . ? H12A C12 H12C 109.5 . . ? H12B C12 H12C 109.5 . . ? C11 C13 H13A 109.5 . . ? C11 C13 H13B 109.5 . . ? H13A C13 H13B 109.5 . . ? C11 C13 H13C 109.5 . . ? H13A C13 H13C 109.5 . . ? H13B C13 H13C 109.5 . . ? C11 C14 H14A 109.5 . . ? C11 C14 H14B 109.5 . . ? H14A C14 H14B 109.5 . . ? C11 C14 H14C 109.5 . . ? H14A C14 H14C 109.5 . . ? H14B C14 H14C 109.5 . . ? _diffrn_measured_fraction_theta_max 0.998 _diffrn_reflns_theta_full 27.47 _diffrn_measured_fraction_theta_full 0.998 _refine_diff_density_max 0.228 _refine_diff_density_min -0.177 _refine_diff_density_rms 0.032 #===END