Wall clock time and date at job start Sat Apr 11 2020 06:08:57 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 N 1.46504 * 1 3 3 C 1.34772 * 120.00067 * 2 1 4 4 O 1.21286 * 119.99947 * 180.02562 * 3 2 1 5 5 C 1.50701 * 120.00030 * 359.97438 * 3 2 1 6 6 S 1.81003 * 109.47053 * 180.02562 * 5 3 2 7 7 C 1.76197 * 99.99978 * 180.02562 * 6 5 3 8 8 H 1.08004 * 120.00145 * 359.97438 * 7 6 5 9 9 C 1.38796 * 120.00125 * 179.97438 * 7 6 5 10 10 N 1.31627 * 120.00115 * 359.97438 * 9 7 6 11 11 Si 1.86805 * 120.00149 * 179.97438 * 9 7 6 12 12 H 1.48500 * 109.47348 * 89.99782 * 11 9 7 13 13 H 1.48500 * 109.46818 * 209.99985 * 11 9 7 14 14 H 1.48503 * 109.47032 * 329.99778 * 11 9 7 15 15 C 1.46500 * 119.99857 * 179.97438 * 2 1 3 16 16 H 1.09000 * 110.64307 * 178.30424 * 15 2 1 17 17 C 1.54596 * 110.72339 * 301.45206 * 15 2 1 18 18 C 1.53998 * 105.14205 * 140.49449 * 17 15 2 19 19 N 1.47898 * 107.22187 * 1.12689 * 18 17 15 20 20 C 1.46898 * 111.00150 * 214.25236 * 19 18 17 21 21 C 1.52997 * 109.47156 * 294.33587 * 20 19 18 22 22 C 1.52995 * 109.47283 * 295.62175 * 21 20 19 23 23 C 1.52997 * 109.47283 * 179.97438 * 22 21 20 24 24 C 1.52997 * 109.47162 * 59.99988 * 23 22 21 25 25 C 1.53002 * 109.47194 * 299.99938 * 24 23 22 26 26 C 1.52997 * 109.47016 * 59.99972 * 25 24 23 27 27 C 1.48816 * 105.68225 * 334.90544 * 19 18 17 28 28 H 1.09003 * 109.46900 * 270.00307 * 1 2 3 29 29 H 1.08997 * 109.47031 * 30.00434 * 1 2 3 30 30 H 1.08998 * 109.46818 * 150.00405 * 1 2 3 31 31 H 1.09001 * 109.47309 * 300.00074 * 5 3 2 32 32 H 1.09000 * 109.46835 * 60.00290 * 5 3 2 33 33 H 0.97003 * 120.00353 * 180.02562 * 10 9 7 34 34 H 1.09003 * 110.31229 * 21.57794 * 17 15 2 35 35 H 1.08998 * 110.39705 * 259.45768 * 17 15 2 36 36 H 1.08997 * 109.91548 * 120.58051 * 18 17 15 37 37 H 1.08996 * 109.91618 * 241.68073 * 18 17 15 38 38 H 1.09004 * 109.46631 * 54.33243 * 20 19 18 39 39 H 1.09000 * 109.47456 * 174.32973 * 20 19 18 40 40 H 1.09000 * 109.47215 * 55.62356 * 21 20 19 41 41 H 1.09000 * 109.47143 * 300.00226 * 22 21 20 42 42 H 1.09000 * 109.46806 * 59.99964 * 22 21 20 43 43 H 1.09000 * 109.47215 * 300.00182 * 23 22 21 44 44 H 1.09002 * 109.47098 * 180.02562 * 23 22 21 45 45 H 1.08995 * 109.47165 * 180.02562 * 24 23 22 46 46 H 1.09000 * 109.46898 * 59.99999 * 24 23 22 47 47 H 1.09000 * 109.47248 * 299.99846 * 25 24 23 48 48 H 1.09000 * 109.46969 * 179.97438 * 25 24 23 49 49 H 1.08995 * 109.47473 * 179.97438 * 26 25 24 50 50 H 1.09000 * 109.47215 * 59.99854 * 26 25 24 51 51 H 1.08999 * 110.51908 * 280.54664 * 27 19 18 52 52 H 1.08999 * 110.84286 * 157.56376 * 27 19 18 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 7 1.4650 0.0000 0.0000 3 6 2.1389 1.1672 0.0000 4 8 3.3518 1.1671 -0.0005 5 6 1.3854 2.4723 -0.0006 6 16 2.5617 3.8480 -0.0012 7 6 1.4417 5.2082 -0.0010 8 1 0.3763 5.0305 -0.0011 9 6 1.9284 6.5080 -0.0009 10 7 3.2267 6.7246 -0.0003 11 14 0.7409 7.9501 -0.0014 12 1 0.4256 8.3322 1.3985 13 1 1.3626 9.1029 -0.7012 14 1 -0.5094 7.5614 -0.7020 15 6 2.1975 -1.2687 0.0006 16 1 3.2726 -1.0918 -0.0297 17 6 1.8176 -2.1192 1.2344 18 6 1.7399 -3.5673 0.7164 19 7 2.0850 -3.5372 -0.7214 20 6 1.3216 -4.5465 -1.4674 21 6 1.7444 -5.9447 -1.0125 22 6 3.2121 -6.1774 -1.3764 23 6 3.6351 -7.5754 -0.9209 24 6 2.7647 -8.6236 -1.6169 25 6 1.2969 -8.3910 -1.2529 26 6 0.8739 -6.9930 -1.7084 27 6 1.7553 -2.1622 -1.1855 28 1 -0.3633 0.0001 1.0277 29 1 -0.3633 0.8899 -0.5139 30 1 -0.3633 -0.8900 -0.5138 31 1 0.7591 2.5299 -0.8908 32 1 0.7585 2.5302 0.8892 33 1 3.5669 7.6330 0.0002 34 1 0.8504 -1.8054 1.6270 35 1 2.5836 -2.0337 2.0052 36 1 2.4507 -4.1933 1.2559 37 1 0.7297 -3.9549 0.8477 38 1 0.2568 -4.4094 -1.2785 39 1 1.5185 -4.4362 -2.5337 40 1 1.6200 -6.0286 0.0672 41 1 3.3364 -6.0935 -2.4560 42 1 3.8322 -5.4308 -0.8801 43 1 3.5108 -7.6589 0.1588 44 1 4.6809 -7.7410 -1.1798 45 1 3.0658 -9.6196 -1.2921 46 1 2.8890 -8.5402 -2.6966 47 1 1.1727 -8.4745 -0.1733 48 1 0.6769 -9.1376 -1.7492 49 1 -0.1718 -6.8274 -1.4496 50 1 0.9982 -6.9096 -2.7881 51 1 0.6840 -2.0650 -1.3617 52 1 2.3162 -1.9118 -2.0859 RHF calculation, no. of doubly occupied orbitals= 63 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). S: (AM1): M.J.S. DEWAR, Y.-C. YUAN, INORGANIC CHEM., 29, 589 (1990) 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 ZINC001698557276.mol2 52 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 06:08:57 Heat of formation + Delta-G solvation = -51.231476 kcal Electronic energy + Delta-G solvation = -27435.867297 eV Core-core repulsion = 23753.436346 eV Total energy + Delta-G solvation = -3682.430951 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 1.75 seconds Orbital eigenvalues (eV) -40.25757 -39.20327 -37.93468 -35.20291 -32.91366 -32.43035 -31.06025 -30.32957 -29.58134 -28.00695 -26.76207 -25.51735 -25.14330 -22.90500 -22.13119 -21.33721 -20.72199 -19.85551 -18.95604 -17.73385 -17.00911 -16.36110 -15.87339 -15.71935 -15.33963 -14.99322 -14.80597 -14.60603 -14.46335 -14.21757 -14.12970 -13.74627 -13.42131 -13.21495 -13.11604 -12.91505 -12.62218 -12.47122 -12.29770 -12.18480 -12.07309 -12.01769 -11.72893 -11.67381 -11.46388 -11.43017 -11.11120 -11.06669 -11.02577 -10.78064 -10.75040 -10.70618 -10.35190 -10.30570 -9.80821 -9.36527 -9.06766 -8.66561 -8.53239 -8.22602 -6.50178 -6.21635 -3.92312 2.85478 3.02635 3.21991 3.24365 3.29644 3.53817 3.81528 4.20088 4.26152 4.39827 4.42316 4.48442 4.60918 4.77858 4.84584 4.90608 4.95713 4.97028 5.06563 5.12675 5.13357 5.15521 5.17553 5.21521 5.22237 5.30055 5.33203 5.37713 5.44670 5.47608 5.56522 5.58095 5.61198 5.71279 5.72529 5.75244 5.81910 5.83119 5.87738 5.88499 5.95074 5.99738 6.06674 6.12409 6.16390 6.19865 6.48555 6.74832 6.77392 7.51700 7.59382 8.34922 8.54586 9.23545 10.85753 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.037426 B = 0.001755 C = 0.001724 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 747.966189 B =15954.647901 C =16238.209497 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.078 3.922 2 N -0.617 5.617 3 C 0.535 3.465 4 O -0.514 6.514 5 C -0.150 4.150 6 S -0.061 6.061 7 C -0.536 4.536 8 H 0.072 0.928 9 C 0.074 3.926 10 N -0.867 5.867 11 Si 0.918 3.082 12 H -0.277 1.277 13 H -0.282 1.282 14 H -0.272 1.272 15 C 0.141 3.859 16 H 0.116 0.884 17 C -0.143 4.143 18 C 0.040 3.960 19 N -0.511 5.511 20 C 0.052 3.948 21 C -0.081 4.081 22 C -0.106 4.106 23 C -0.121 4.121 24 C -0.120 4.120 25 C -0.118 4.118 26 C -0.115 4.115 27 C 0.026 3.974 28 H 0.054 0.946 29 H 0.077 0.923 30 H 0.066 0.934 31 H 0.089 0.911 32 H 0.089 0.911 33 H 0.268 0.732 34 H 0.072 0.928 35 H 0.078 0.922 36 H 0.079 0.921 37 H 0.044 0.956 38 H 0.034 0.966 39 H 0.075 0.925 40 H 0.069 0.931 41 H 0.058 0.942 42 H 0.075 0.925 43 H 0.058 0.942 44 H 0.059 0.941 45 H 0.057 0.943 46 H 0.060 0.940 47 H 0.060 0.940 48 H 0.059 0.941 49 H 0.058 0.942 50 H 0.062 0.938 51 H 0.050 0.950 52 H 0.087 0.913 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -7.336 -30.087 -1.700 31.015 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 -0.066 4.066 2 N -0.353 5.353 3 C 0.323 3.677 4 O -0.387 6.387 5 C -0.300 4.300 6 S 0.166 5.834 7 C -0.684 4.684 8 H 0.090 0.910 9 C -0.136 4.136 10 N -0.502 5.502 11 Si 0.745 3.255 12 H -0.203 1.203 13 H -0.207 1.207 14 H -0.197 1.197 15 C 0.037 3.963 16 H 0.133 0.867 17 C -0.182 4.182 18 C -0.088 4.088 19 N -0.235 5.235 20 C -0.076 4.076 21 C -0.100 4.100 22 C -0.144 4.144 23 C -0.159 4.159 24 C -0.158 4.158 25 C -0.155 4.155 26 C -0.153 4.153 27 C -0.103 4.103 28 H 0.073 0.927 29 H 0.096 0.904 30 H 0.085 0.915 31 H 0.108 0.892 32 H 0.107 0.893 33 H 0.078 0.922 34 H 0.091 0.909 35 H 0.096 0.904 36 H 0.098 0.902 37 H 0.062 0.938 38 H 0.052 0.948 39 H 0.093 0.907 40 H 0.087 0.913 41 H 0.076 0.924 42 H 0.094 0.906 43 H 0.077 0.923 44 H 0.078 0.922 45 H 0.076 0.924 46 H 0.079 0.921 47 H 0.079 0.921 48 H 0.078 0.922 49 H 0.077 0.923 50 H 0.081 0.919 51 H 0.068 0.932 52 H 0.106 0.894 Dipole moment (debyes) X Y Z Total from point charges -4.841 -30.061 -1.794 30.501 hybrid contribution -3.262 1.043 0.137 3.427 sum -8.103 -29.018 -1.657 30.174 Atomic orbital electron populations 1.21747 0.80054 1.03060 1.01720 1.47800 1.06577 1.05304 1.75600 1.20365 0.87956 0.84499 0.74887 1.90697 1.13721 1.86692 1.47630 1.23558 1.04554 0.97195 1.04703 1.85412 1.08012 0.93304 1.96699 1.22858 0.94302 0.92231 1.58994 0.90963 1.24988 0.95664 0.98361 0.94539 1.70017 1.11733 1.21661 1.46812 0.86174 0.80264 0.80745 0.78343 1.20275 1.20736 1.19718 1.21823 0.98966 0.82339 0.93215 0.86652 1.22789 1.02696 0.94144 0.98601 1.22820 0.99623 0.96833 0.89528 1.64735 1.53310 1.02826 1.02593 1.22344 0.94833 0.91640 0.98787 1.21143 0.95835 0.92825 1.00212 1.21474 0.95443 0.96333 1.01111 1.21561 0.99019 0.95153 1.00140 1.21545 0.95052 0.98631 1.00549 1.21503 0.96314 0.96623 1.01072 1.21564 0.98835 0.94458 1.00427 1.23591 0.99587 0.88211 0.98909 0.92747 0.90435 0.91525 0.89245 0.89279 0.92178 0.90942 0.90370 0.90230 0.93802 0.94822 0.90656 0.91253 0.92372 0.90595 0.92273 0.92181 0.92394 0.92112 0.92145 0.92234 0.92300 0.91922 0.93204 0.89442 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 0.08 0.81 9.15 59.85 0.55 1.36 16 2 N -0.62 -8.69 2.89 -171.80 -0.50 -9.19 16 3 C 0.53 10.19 7.69 -10.99 -0.08 10.11 16 4 O -0.51 -11.80 15.23 5.55 0.08 -11.71 16 5 C -0.15 -3.04 4.71 36.01 0.17 -2.87 16 6 S -0.06 -1.66 20.57 -107.50 -2.21 -3.87 16 7 C -0.54 -15.25 9.50 30.94 0.29 -14.96 16 8 H 0.07 1.94 7.80 -52.48 -0.41 1.53 16 9 C 0.07 2.11 5.49 -17.43 -0.10 2.01 16 10 N -0.87 -26.16 13.22 55.49 0.73 -25.43 16 11 Si 0.92 21.37 29.55 -169.99 -5.02 16.35 16 12 H -0.28 -6.32 7.11 56.52 0.40 -5.92 16 13 H -0.28 -6.46 7.11 56.52 0.40 -6.05 16 14 H -0.27 -6.15 7.11 56.52 0.40 -5.74 16 15 C 0.14 1.78 3.46 -66.07 -0.23 1.55 16 16 H 0.12 1.77 6.99 -51.93 -0.36 1.41 16 17 C -0.14 -1.46 6.55 -25.37 -0.17 -1.62 16 18 C 0.04 0.35 5.52 -2.75 -0.02 0.33 16 19 N -0.51 -4.76 4.73 -230.21 -1.09 -5.85 16 20 C 0.05 0.41 4.15 -3.83 -0.02 0.39 16 21 C -0.08 -0.56 2.14 -90.62 -0.19 -0.76 16 22 C -0.11 -0.79 5.09 -26.74 -0.14 -0.93 16 23 C -0.12 -0.80 5.92 -26.73 -0.16 -0.96 16 24 C -0.12 -0.72 5.92 -26.73 -0.16 -0.87 16 25 C -0.12 -0.68 5.92 -26.73 -0.16 -0.83 16 26 C -0.11 -0.70 5.21 -26.73 -0.14 -0.84 16 27 C 0.03 0.27 6.11 -1.74 -0.01 0.26 16 28 H 0.05 0.52 7.90 -51.93 -0.41 0.11 16 29 H 0.08 0.82 6.44 -51.93 -0.33 0.48 16 30 H 0.07 0.56 6.08 -51.93 -0.32 0.24 16 31 H 0.09 1.68 7.40 -51.91 -0.38 1.29 16 32 H 0.09 1.68 8.11 -51.92 -0.42 1.26 16 33 H 0.27 7.52 8.31 -40.82 -0.34 7.18 16 34 H 0.07 0.70 6.99 -51.93 -0.36 0.34 16 35 H 0.08 0.83 8.14 -51.93 -0.42 0.40 16 36 H 0.08 0.67 8.11 -51.93 -0.42 0.25 16 37 H 0.04 0.35 7.64 -51.93 -0.40 -0.05 16 38 H 0.03 0.26 7.94 -51.93 -0.41 -0.16 16 39 H 0.07 0.60 8.14 -51.93 -0.42 0.18 16 40 H 0.07 0.51 7.22 -51.93 -0.37 0.14 16 41 H 0.06 0.45 8.14 -51.93 -0.42 0.03 16 42 H 0.08 0.68 7.73 -51.93 -0.40 0.27 16 43 H 0.06 0.40 8.14 -51.93 -0.42 -0.03 16 44 H 0.06 0.39 8.14 -51.93 -0.42 -0.03 16 45 H 0.06 0.32 8.14 -51.93 -0.42 -0.11 16 46 H 0.06 0.37 8.14 -51.93 -0.42 -0.05 16 47 H 0.06 0.35 8.14 -51.93 -0.42 -0.07 16 48 H 0.06 0.31 8.14 -51.93 -0.42 -0.11 16 49 H 0.06 0.34 8.14 -51.93 -0.42 -0.08 16 50 H 0.06 0.39 8.14 -51.93 -0.42 -0.04 16 51 H 0.05 0.48 5.97 -51.93 -0.31 0.17 16 52 H 0.09 0.99 8.14 -51.93 -0.42 0.57 16 LS Contribution 408.39 15.07 6.15 6.15 Total: -1.00 -32.85 408.39 -11.92 -44.77 By element: Atomic # 1 Polarization: 6.94 SS G_CDS: -9.53 Total: -2.59 kcal Atomic # 6 Polarization: -8.08 SS G_CDS: -0.55 Total: -8.63 kcal Atomic # 7 Polarization: -39.62 SS G_CDS: -0.85 Total: -40.47 kcal Atomic # 8 Polarization: -11.80 SS G_CDS: 0.08 Total: -11.71 kcal Atomic # 14 Polarization: 21.37 SS G_CDS: -5.02 Total: 16.35 kcal Atomic # 16 Polarization: -1.66 SS G_CDS: -2.21 Total: -3.87 kcal Total LS contribution 6.15 Total: 6.15 kcal Total: -32.85 -11.92 -44.77 kcal The number of atoms in the molecule is 52 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. ZINC001698557276.mol2 52 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 -6.460 kcal (2) G-P(sol) polarization free energy of solvation -32.848 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -39.308 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.923 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.771 kcal (6) G-S(sol) free energy of system = (1) + (5) -51.231 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.75 seconds