Wall clock time and date at job start Sat Apr 11 2020 06:13:06 AMSOL-version 7.1 by G. D. Hawkins, D. J. Giesen, G. C. Lynch, C. C. Chambers, I. Rossi, J. W. Storer, J. Li, J. D. Thompson, P. Winget, B. J. Lynch, D. Rinaldi, D. A. Liotard, C. J. Cramer, and D. G. Truhlar Copyright 2004 by Regents of the University of Minnesota. All rights reserved. Notice: recipients of this code are asked to comply with the user agreement in Section 1 of the documentation file. ******************************************************************************* * 1SCF - SCF CALCULATION WITHOUT GEOMETRY OPTIMIZATION * - USE EF ROUTINE FOR MINIMUM SEARCH (DEFAULT) * GEO-OK - OVERRIDE INTERATOMIC DISTANCE CHECK * TLIMIT= - A TIME OF 15. SECONDS REQUESTED * CHARGE - CHARGE ON SYSTEM= -1 * AM1 - THE AM1 HAMILTONIAN TO BE USED * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* Atom NO. Chemical Bond length Bond angle Dihedral angle number (k) symbol (angstroms) (degrees) (degrees) (I) NA:I NB:NA:I NC:NB:NA:I NA NB NC 1 1 C 2 2 C 1.53005 * 1 3 3 C 1.52997 * 109.47040 * 2 1 4 4 C 1.53005 * 109.47040 * 179.97438 * 3 2 1 5 5 H 1.08998 * 109.46949 * 305.00280 * 4 3 2 6 6 N 1.46499 * 109.46806 * 65.00003 * 4 3 2 7 7 C 1.34779 * 119.99892 * 274.99305 * 6 4 3 8 8 N 1.34781 * 119.99799 * 180.02562 * 7 6 4 9 9 O 1.21586 * 119.99981 * 0.02562 * 7 6 4 10 10 C 1.50701 * 109.47280 * 184.99940 * 4 3 2 11 11 O 1.21284 * 119.99959 * 240.00121 * 10 4 3 12 12 N 1.34780 * 119.99942 * 59.99745 * 10 4 3 13 13 C 1.46493 * 119.99770 * 175.09416 * 12 10 4 14 14 H 1.08997 * 109.47520 * 4.68356 * 13 12 10 15 15 C 1.53009 * 109.47135 * 244.68505 * 13 12 10 16 16 N 1.46503 * 109.46553 * 54.99875 * 15 13 12 17 17 C 1.36945 * 119.99457 * 180.02562 * 16 15 13 18 18 H 1.07996 * 119.99905 * 0.02562 * 17 16 15 19 19 C 1.38815 * 119.99515 * 180.02562 * 17 16 15 20 20 N 1.31622 * 119.99335 * 180.02562 * 19 17 16 21 21 Si 1.86802 * 120.00363 * 359.97438 * 19 17 16 22 22 H 1.48495 * 109.47110 * 90.00187 * 21 19 17 23 23 H 1.48497 * 109.47170 * 210.00136 * 21 19 17 24 24 H 1.48501 * 109.46822 * 330.00230 * 21 19 17 25 25 C 1.52998 * 109.47531 * 124.68609 * 13 12 10 26 26 C 1.54276 * 110.02923 * 57.03072 * 25 13 12 27 27 C 1.54958 * 104.15841 * 217.13801 * 26 25 13 28 28 C 1.54890 * 102.77923 * 37.88930 * 27 26 25 29 29 C 1.53875 * 110.02990 * 299.81686 * 25 13 12 30 30 H 1.09000 * 109.46859 * 300.00362 * 1 2 3 31 31 H 1.08995 * 109.47072 * 60.00264 * 1 2 3 32 32 H 1.08998 * 109.46742 * 180.02562 * 1 2 3 33 33 H 1.09000 * 109.46859 * 239.99638 * 2 1 3 34 34 H 1.08995 * 109.47072 * 119.99736 * 2 1 3 35 35 H 1.09000 * 109.47590 * 60.00086 * 3 2 1 36 36 H 1.08998 * 109.47410 * 299.99521 * 3 2 1 37 37 H 0.96999 * 120.00172 * 95.00845 * 6 4 3 38 38 H 0.96995 * 119.99990 * 0.02562 * 8 7 6 39 39 H 0.97002 * 119.99462 * 180.02562 * 8 7 6 40 40 H 0.97001 * 119.99674 * 355.09201 * 12 10 4 41 41 H 1.08991 * 109.47572 * 175.00066 * 15 13 12 42 42 H 1.08999 * 109.46740 * 295.00612 * 15 13 12 43 43 H 0.96996 * 120.00586 * 0.02562 * 16 15 13 44 44 H 0.97001 * 119.99638 * 179.97438 * 20 19 17 45 45 H 1.08992 * 110.01910 * 178.42076 * 25 13 12 46 46 H 1.08999 * 110.48529 * 335.78976 * 26 25 13 47 47 H 1.08997 * 110.48366 * 98.43075 * 26 25 13 48 48 H 1.09000 * 110.72242 * 279.57280 * 27 26 25 49 49 H 1.09003 * 110.76566 * 156.22190 * 27 26 25 50 50 H 1.09001 * 110.48889 * 203.40505 * 28 27 26 51 51 H 1.09004 * 110.59993 * 80.81710 * 28 27 26 52 52 H 1.08999 * 110.02957 * 238.56516 * 29 25 13 53 53 H 1.08998 * 110.03152 * 359.95035 * 29 25 13 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 6 0.0000 0.0000 0.0000 2 6 1.5300 0.0000 0.0000 3 6 2.0400 1.4425 0.0000 4 6 3.5701 1.4425 0.0006 5 1 3.9330 0.8531 0.8427 6 7 4.0588 0.8586 -1.2509 7 6 4.1877 -0.4781 -1.3657 8 7 4.6379 -1.0153 -2.5170 9 8 3.8978 -1.1994 -0.4308 10 6 4.0724 2.8579 0.1245 11 8 4.7700 3.3322 -0.7469 12 7 3.7463 3.5967 1.2035 13 6 4.3207 4.9331 1.3769 14 1 4.9167 5.1889 0.5009 15 6 5.2108 4.9481 2.6214 16 7 6.2173 3.8889 2.5145 17 6 7.1311 3.7091 3.5185 18 1 7.1095 4.3477 4.3891 19 6 8.0851 2.7058 3.4171 20 7 8.9630 2.5326 4.3823 21 14 8.1220 1.6007 1.9115 22 1 9.0036 2.2010 0.8783 23 1 8.6442 0.2635 2.2916 24 1 6.7474 1.4590 1.3677 25 6 3.1942 5.9549 1.5434 26 6 2.2978 5.5634 2.7364 27 6 0.8673 5.9408 2.2754 28 6 0.8798 5.5611 0.7738 29 6 2.2931 5.9538 0.2961 30 1 -0.3633 0.5139 0.8900 31 1 -0.3633 0.5138 -0.8900 32 1 -0.3633 -1.0277 0.0005 33 1 1.8933 -0.5139 -0.8900 34 1 1.8934 -0.5138 0.8900 35 1 1.6767 1.9564 0.8900 36 1 1.6768 1.9563 -0.8900 37 1 4.2900 1.4339 -1.9968 38 1 4.8695 -0.4399 -3.2627 39 1 4.7302 -1.9774 -2.5997 40 1 3.1312 3.2435 1.8652 41 1 5.7078 5.9149 2.7010 42 1 4.5990 4.7799 3.5076 43 1 6.2365 3.3151 1.7328 44 1 9.6295 1.8313 4.3116 45 1 3.6124 6.9490 1.7010 46 1 2.3662 4.4929 2.9298 47 1 2.5754 6.1310 3.6245 48 1 0.6903 7.0088 2.4023 49 1 0.1209 5.3577 2.8150 50 1 0.1227 6.1268 0.2309 51 1 0.7182 4.4905 0.6476 52 1 2.2733 6.9477 -0.1511 53 1 2.6589 5.2260 -0.4281 RHF calculation, no. of doubly occupied orbitals= 66 REFERENCES FOR PARAMETERS IN GAS-PHASE HAMILTONIAN: H: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) C: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) N: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) O: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) Si: (AM1): M.J.S.DEWAR, C. JIE, ORGANOMETALLICS, 6, 1486-1490 (1987). REFERENCE FOR CHARGE MODEL 2: J. Li, J. Xing, C. J. Cramer, and D. G. Truhlar, J. Chem. Phys. 111 (1999) 885. REFERENCE FOR THE PARAMETERIZATION OF THE SM5.42R SOLVATION MODEL: J. Li, T. Zhu, G. D. Hawkins, P. Winget, D. A. Liotard, C. J. Cramer, and D. G. Truhlar, Theor. Chem. Acc. 103 (1999) 9-63 P. Winget, J. D. Thompson C. J. Cramer,and D. G. Truhlar, J. Phys. Chem. B. submitted. CHARGE=-1 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV ZINC001724102721.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:13:06 Heat of formation + Delta-G solvation = -76.527009 kcal Electronic energy + Delta-G solvation = -32526.387531 eV Core-core repulsion = 28432.399564 eV Total energy + Delta-G solvation = -4093.987968 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.75 seconds Orbital eigenvalues (eV) -40.72386 -39.68593 -38.19398 -35.89119 -35.37373 -34.03483 -33.59136 -32.95769 -31.51258 -30.28778 -28.81030 -28.77261 -26.54699 -24.95873 -23.08062 -21.61550 -21.47285 -21.29961 -20.55377 -20.10859 -19.37068 -18.63646 -17.81017 -17.50168 -16.53552 -16.18099 -16.02919 -15.73795 -15.07749 -14.90677 -14.61702 -14.41351 -14.30078 -14.07667 -13.82312 -13.58317 -13.41167 -13.29395 -13.04536 -12.73563 -12.60413 -12.23930 -11.89879 -11.82648 -11.64459 -11.54386 -11.21713 -11.15748 -11.09004 -10.85842 -10.71132 -10.68380 -10.64475 -10.54801 -10.46738 -10.27122 -10.09237 -9.74317 -9.70258 -9.57974 -9.08773 -8.87843 -8.80814 -7.20675 -5.75145 -3.09984 2.63417 2.68517 3.18266 3.38357 3.42603 3.47934 3.51036 4.38715 4.49422 4.54716 4.61086 4.62880 4.66648 4.82112 4.93324 5.05784 5.14387 5.28023 5.33979 5.40310 5.44643 5.52108 5.53177 5.55328 5.58438 5.59654 5.72288 5.75683 5.78140 5.80614 5.84874 5.86977 5.99749 6.00901 6.06368 6.16031 6.20468 6.24849 6.31979 6.35611 6.39230 6.40990 6.58950 6.60910 6.79879 6.83757 7.57943 7.89410 8.00802 8.27446 8.44169 8.57306 9.23679 9.96567 10.15970 11.43078 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.006814 B = 0.006092 C = 0.003661 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 4108.314686 B = 4595.160472 C = 7645.841139 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.151 4.151 2 C -0.116 4.116 3 C -0.123 4.123 4 C 0.143 3.857 5 H 0.117 0.883 6 N -0.725 5.725 7 C 0.708 3.292 8 N -0.868 5.868 9 O -0.587 6.587 10 C 0.516 3.484 11 O -0.541 6.541 12 N -0.702 5.702 13 C 0.133 3.867 14 H 0.101 0.899 15 C 0.146 3.854 16 N -0.752 5.752 17 C -0.243 4.243 18 H 0.090 0.910 19 C 0.007 3.993 20 N -0.933 5.933 21 Si 0.885 3.115 22 H -0.286 1.286 23 H -0.292 1.292 24 H -0.280 1.280 25 C -0.097 4.097 26 C -0.119 4.119 27 C -0.124 4.124 28 C -0.122 4.122 29 C -0.118 4.118 30 H 0.052 0.948 31 H 0.048 0.952 32 H 0.052 0.948 33 H 0.067 0.933 34 H 0.071 0.929 35 H 0.075 0.925 36 H 0.068 0.932 37 H 0.405 0.595 38 H 0.397 0.603 39 H 0.414 0.586 40 H 0.400 0.600 41 H 0.037 0.963 42 H 0.032 0.968 43 H 0.362 0.638 44 H 0.259 0.741 45 H 0.085 0.915 46 H 0.066 0.934 47 H 0.070 0.930 48 H 0.064 0.936 49 H 0.063 0.937 50 H 0.059 0.941 51 H 0.062 0.938 52 H 0.060 0.940 53 H 0.066 0.934 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -20.170 1.379 -13.164 24.125 Note: The Mulliken population analysis charges presented below were not used in the solvation calculation but are provided for completeness. The chosen solvation model uses CM2 partial charges for calculating solvation energies. Net atomic charges, atomic populations, and dipole contributions using Mulliken population analysis Atom NO. Type Charge No. of electrons 1 C -0.209 4.209 2 C -0.154 4.154 3 C -0.162 4.162 4 C 0.033 3.967 5 H 0.135 0.865 6 N -0.382 5.382 7 C 0.406 3.594 8 N -0.436 5.436 9 O -0.465 6.465 10 C 0.301 3.699 11 O -0.418 6.418 12 N -0.354 5.354 13 C 0.028 3.972 14 H 0.119 0.881 15 C 0.018 3.982 16 N -0.398 5.398 17 C -0.373 4.373 18 H 0.108 0.892 19 C -0.189 4.189 20 N -0.581 5.581 21 Si 0.716 3.284 22 H -0.213 1.213 23 H -0.218 1.218 24 H -0.206 1.206 25 C -0.117 4.117 26 C -0.157 4.157 27 C -0.162 4.162 28 C -0.159 4.159 29 C -0.155 4.155 30 H 0.071 0.929 31 H 0.067 0.933 32 H 0.071 0.929 33 H 0.085 0.915 34 H 0.090 0.910 35 H 0.094 0.906 36 H 0.087 0.913 37 H 0.241 0.759 38 H 0.224 0.776 39 H 0.246 0.754 40 H 0.236 0.764 41 H 0.054 0.946 42 H 0.050 0.950 43 H 0.195 0.805 44 H 0.069 0.931 45 H 0.103 0.897 46 H 0.085 0.915 47 H 0.089 0.911 48 H 0.083 0.917 49 H 0.082 0.918 50 H 0.078 0.922 51 H 0.081 0.919 52 H 0.078 0.922 53 H 0.085 0.915 Dipole moment (debyes) X Y Z Total from point charges -19.800 1.291 -12.664 23.539 hybrid contribution 0.328 -0.878 -1.426 1.706 sum -19.472 0.413 -14.089 24.038 Atomic orbital electron populations 1.21796 0.96385 1.01393 1.01282 1.21567 0.94681 0.95334 1.03789 1.22018 0.92598 0.98849 1.02733 1.20730 0.94835 0.92055 0.89044 0.86518 1.44699 1.71301 1.05500 1.16733 1.15833 0.78002 0.82211 0.83338 1.42937 1.73622 1.11695 1.15342 1.90988 1.56872 1.60117 1.38522 1.20444 0.80118 0.87215 0.82133 1.90676 1.38383 1.72412 1.40377 1.45809 1.47922 1.17479 1.24169 1.21464 0.93783 0.80991 1.00933 0.88062 1.21032 0.90111 0.92861 0.94204 1.42645 1.36250 1.37836 1.23085 1.19035 1.06036 1.13741 0.98509 0.89181 1.24632 0.97846 0.98953 0.97440 1.69700 1.20337 1.35259 1.32812 0.86554 0.77526 0.80736 0.83597 1.21266 1.21824 1.20621 1.22078 0.95333 0.99120 0.95163 1.22446 0.94166 1.01364 0.97708 1.22509 0.96993 1.00955 0.95722 1.22331 0.96757 1.00866 0.95981 1.22149 0.94598 1.01340 0.97437 0.92884 0.93271 0.92913 0.91468 0.91023 0.90642 0.91320 0.75936 0.77572 0.75377 0.76372 0.94561 0.94990 0.80482 0.93091 0.89712 0.91544 0.91147 0.91682 0.91826 0.92247 0.91906 0.92165 0.91536 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 13. Note: The number of geometries may not correspond to the number of cycles due to rejected geometry changes. In the following table subtotal= G_P + SS G_CDS. Atom Chem. CM2 G_P Area Sigma k SS G_CDS Subtotal M number symbol chg. (kcal) (Ang**2) cal/(Ang**2) (kcal) (kcal) value 1 C -0.15 -1.39 9.91 37.16 0.37 -1.02 16 2 C -0.12 -1.32 4.53 -26.73 -0.12 -1.44 16 3 C -0.12 -1.30 4.83 -26.73 -0.13 -1.43 16 4 C 0.14 1.97 2.68 -69.08 -0.18 1.79 16 5 H 0.12 1.91 7.58 -51.93 -0.39 1.51 16 6 N -0.72 -9.45 4.91 -59.81 -0.29 -9.75 16 7 C 0.71 9.69 7.41 -86.91 -0.64 9.04 16 8 N -0.87 -7.97 8.88 27.64 0.25 -7.72 16 9 O -0.59 -10.10 14.31 5.29 0.08 -10.02 16 10 C 0.52 7.88 6.33 -10.98 -0.07 7.81 16 11 O -0.54 -9.70 15.18 5.55 0.08 -9.62 16 12 N -0.70 -9.68 3.65 -53.81 -0.20 -9.88 16 13 C 0.13 1.95 2.04 -67.93 -0.14 1.81 16 14 H 0.10 1.70 6.91 -51.93 -0.36 1.35 16 15 C 0.15 2.70 5.84 -4.04 -0.02 2.67 16 16 N -0.75 -18.09 5.24 -59.90 -0.31 -18.40 16 17 C -0.24 -7.00 10.47 -15.05 -0.16 -7.16 16 18 H 0.09 2.74 8.06 -52.49 -0.42 2.31 16 19 C 0.01 0.22 5.50 -17.43 -0.10 0.12 16 20 N -0.93 -29.99 13.97 55.49 0.78 -29.21 16 21 Si 0.89 23.84 27.74 -169.99 -4.71 19.13 16 22 H -0.29 -7.75 7.11 56.52 0.40 -7.35 16 23 H -0.29 -7.95 7.11 56.52 0.40 -7.55 16 24 H -0.28 -7.30 6.52 56.52 0.37 -6.93 16 25 C -0.10 -1.08 2.81 -89.50 -0.25 -1.33 16 26 C -0.12 -1.18 5.13 -25.03 -0.13 -1.31 16 27 C -0.12 -1.04 6.91 -24.70 -0.17 -1.21 16 28 C -0.12 -1.04 6.83 -25.07 -0.17 -1.22 16 29 C -0.12 -1.19 6.19 -25.61 -0.16 -1.34 16 30 H 0.05 0.45 8.14 -51.93 -0.42 0.02 16 31 H 0.05 0.41 8.14 -51.93 -0.42 -0.01 16 32 H 0.05 0.48 8.14 -51.93 -0.42 0.05 16 33 H 0.07 0.86 5.65 -51.93 -0.29 0.56 16 34 H 0.07 0.95 7.84 -51.93 -0.41 0.54 16 35 H 0.08 0.69 7.32 -51.93 -0.38 0.31 16 36 H 0.07 0.68 8.14 -51.93 -0.42 0.25 16 37 H 0.40 4.76 7.80 -40.82 -0.32 4.44 16 38 H 0.40 2.54 8.84 -40.82 -0.36 2.18 16 39 H 0.41 3.27 8.93 -40.82 -0.36 2.91 16 40 H 0.40 4.80 6.18 -40.82 -0.25 4.54 16 41 H 0.04 0.68 8.14 -51.93 -0.42 0.26 16 42 H 0.03 0.58 7.13 -51.93 -0.37 0.21 16 43 H 0.36 8.91 4.67 -40.82 -0.19 8.72 16 44 H 0.26 7.97 8.31 -40.82 -0.34 7.63 16 45 H 0.08 0.91 8.14 -51.93 -0.42 0.49 16 46 H 0.07 0.68 5.96 -51.93 -0.31 0.37 16 47 H 0.07 0.71 8.14 -51.93 -0.42 0.28 16 48 H 0.06 0.52 8.14 -51.93 -0.42 0.10 16 49 H 0.06 0.49 8.14 -51.93 -0.42 0.07 16 50 H 0.06 0.47 8.14 -51.93 -0.42 0.04 16 51 H 0.06 0.53 8.14 -51.93 -0.42 0.11 16 52 H 0.06 0.57 8.14 -51.93 -0.42 0.15 16 53 H 0.07 0.78 7.12 -51.93 -0.37 0.41 16 LS Contribution 408.03 15.07 6.15 6.15 Total: -1.00 -36.27 408.03 -9.30 -45.57 By element: Atomic # 1 Polarization: 27.01 SS G_CDS: -9.03 Total: 17.98 kcal Atomic # 6 Polarization: 7.85 SS G_CDS: -2.08 Total: 5.78 kcal Atomic # 7 Polarization: -75.18 SS G_CDS: 0.22 Total: -74.96 kcal Atomic # 8 Polarization: -19.80 SS G_CDS: 0.16 Total: -19.64 kcal Atomic # 14 Polarization: 23.84 SS G_CDS: -4.71 Total: 19.13 kcal Total LS contribution 6.15 Total: 6.15 kcal Total: -36.27 -9.30 -45.57 kcal The number of atoms in the molecule is 53 The average number of expansion shells was 16.00 The maximum number of expansion shells was 16 The minimum number of expansion shells was 16 **** NOTA BENE **** This is the net solvation energy for this exact molecular structure (nuclear and electronic)! The standard-state solvation energy should be obtained as the difference between the heat of formation plus delta-G solvation for the relaxed solvated system and that for the relaxed gas-phase system. ZINC001724102721.mol2 53 1SCF run This is a breakdown of the solvation energy calculated without geometric relaxation in solution: (1) E-EN(sol) electronic-nuclear energy of solute -30.960 kcal (2) G-P(sol) polarization free energy of solvation -36.267 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -67.228 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.299 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.567 kcal (6) G-S(sol) free energy of system = (1) + (5) -76.527 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.75 seconds