# Supplementary Material (ESI) for ChemComm # This journal is © The Royal Society of Chemistry 2000 # CCDC Number: 182/1559 data_mystry _audit_creation_method SHELXL-97 _chemical_name_systematic ; ? ; _chemical_name_common ? _chemical_melting_point ? _chemical_formula_moiety [Cr12O8(OH)4(iPrCOO)16(iPrCOOH)4].3.5CH2Cl2 _chemical_formula_sum 'C83.50 H155 Cl3.50 Cr12 O53' _chemical_formula_weight 2755.15 loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source 'C' 'C' 0.0181 0.0091 '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' 'O' 'O' 0.0492 0.0322 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'Cr' 'Cr' -0.1635 2.4439 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'Cl' 'Cl' 0.3639 0.7018 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _symmetry_cell_setting Triclinic _symmetry_space_group_name_H-M P-1 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, -y, -z' _cell_length_a 16.770(5) _cell_length_b 17.049(6) _cell_length_c 24.405(9) _cell_angle_alpha 88.12(3) _cell_angle_beta 85.11(3) _cell_angle_gamma 69.756(15) _cell_volume 6523(4) _cell_formula_units_Z 2 _cell_measurement_temperature 150(2) _cell_measurement_reflns_used 32 _cell_measurement_theta_min 20 _cell_measurement_theta_max 22 _exptl_crystal_description block _exptl_crystal_colour Green _exptl_crystal_size_max 0.54 _exptl_crystal_size_mid 0.43 _exptl_crystal_size_min 0.31 _exptl_crystal_density_meas ? _exptl_crystal_density_diffrn 1.403 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 2855 _exptl_absorpt_coefficient_mu 9.234 _exptl_absorpt_correction_type 'Optimised numerical' _exptl_absorpt_correction_T_min 0.052 _exptl_absorpt_correction_T_max 0.279 _exptl_absorpt_process_details ? _exptl_special_details ; ? ; _diffrn_ambient_temperature 220(2) _diffrn_radiation_wavelength 1.54184 _diffrn_radiation_type CuK\a _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device_type ? _diffrn_measurement_method Omega-theta _diffrn_detector_area_resol_mean ? _diffrn_standards_number 3 _diffrn_standards_interval_count ? _diffrn_standards_interval_time 60 _diffrn_standards_decay_% ? _diffrn_reflns_number 16423 _diffrn_reflns_av_R_equivalents 0.3706 _diffrn_reflns_av_sigmaI/netI 0.1764 _diffrn_reflns_limit_h_min -17 _diffrn_reflns_limit_h_max 17 _diffrn_reflns_limit_k_min -18 _diffrn_reflns_limit_k_max 18 _diffrn_reflns_limit_l_min 0 _diffrn_reflns_limit_l_max 25 _diffrn_reflns_theta_min 2.76 _diffrn_reflns_theta_max 55.18 _reflns_number_total 16350 _reflns_number_gt 7089 _reflns_threshold_expression 2sigma(I) _computing_data_collection 'Stoe DIF4' _computing_cell_refinement 'Stoe DIF4' _computing_data_reduction 'Stoe REDU4' _computing_structure_solution DIRDIF _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics SHELXTL _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. Diffuse solvent region present. Top 10 disagreeable refsfollow, model including some partial wt solvent. No significant peaks in diff. map but clearly low angle data are poorly modelled. h k l Fo^2 Fc^2 Delta(F^2)/esd Fc/Fc(max) Resolution 0 1 4 4876.38 160.56 13.03 0.016 5.69 2 0 1 4740.67 352.79 11.90 0.024 7.64 -1 1 2 3277.16 242.42 10.96 0.020 7.40 -2 1 0 11510.44 2638.91 9.73 0.067 6.24 0 1 1 159.13 17542.97 9.68 0.172 13.39 -1 0 2 15556.68 3898.49 9.60 0.081 9.26 1 1 0 4461.87 41743.13 8.46 0.265 13.83 -1 -2 1 2762.81 116.47 8.12 0.014 7.82 -3 2 2 10816.12 3291.35 7.88 0.074 3.58 2 -1 2 13871.92 4163.77 7.77 0.084 5.70 1 0 0 12911.20 56481.91 6.93 0.308 15.69 1 3 0 3626.51 15091.39 6.45 0.159 5.68 Platon 'Bypass' treatment used. Final cycle given below. Cycle = 5, R(F) = 0.23, Nref(Hemi) = 16350, R(F 4 SIGF) = 0.10 Nref = 7244 Density Maxima in Enhanced (Full) Difference Map x y z (e/A^3) Shortest Contacts within 0.686 0.441 0.408 2.70 void 0.173 0.543 0.601 2.48 void 0.326 0.549 0.629 2.42 void O1I 2.86; C20# 3.17; 0.129 0.515 0.406 2.40 void 0.814 0.700 0.438 2.20 void O13# 2.81; 0.086 0.283 0.924 2.20 void 0.980 0.640 0.075 2.18 void 0.744 0.452 0.411 2.05 void 0.017 0.423 0.940 1.96 void 0.088 0.386 0.907 1.93 void 0.153 0.271 0.608 1.93 void 0.017 0.454 0.000 1.93 void O1F 2.91; 0.871 0.751 0.278 1.90 void VOID # gridpnts Electron-Count (e-) ======================================== A 94089 311.6 B 2386 2.6 C 2391 2.3 Total (Positive) Electron Count/Cell = 316.5 :: Fo-scale =0.138640E+01 - SinT/L-Min = 0.20 Cycle = 6, R(F) = 0.23, Nref(Hemi) = 16350, R(F 4 SIGF) = 0.10 Nref = 7245 SQUEEZE Statistics on the Difference Map Phasing ======================================================================= ======== FcMod = Average contribution to Fc from discrete model FcSolv = Average contribution to Fc from solvent region FcTot = Average Fc total ( = model + solvent contrib.) DelMS = Average Phase difference between model and solvent contrib. DelMT = Average Phase difference between model and combined contrib. N = Number of reflections in Sin(Theta)/Lambda range R(Mod) = SIGMA(ABS(ABS(FcMod) - Fo)) / SIGMA(Fo) R(Tot) = SIGMA(ABS(ABS(FcTot) - Fo)) / SIGMA(Fo) SinT/L