Wall clock time and date at job start Sat Apr 11 2020 06:13:18 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 O 1.42893 * 109.47282 * 2 1 4 4 C 1.42903 * 113.99862 * 179.97438 * 3 2 1 5 5 C 1.53002 * 109.47002 * 179.97438 * 4 3 2 6 6 C 1.50696 * 109.47177 * 179.97438 * 5 4 3 7 7 O 1.21291 * 120.00047 * 0.02562 * 6 5 4 8 8 N 1.34774 * 120.00580 * 180.02562 * 6 5 4 9 9 C 1.46498 * 120.00602 * 180.02562 * 8 6 5 10 10 H 1.09000 * 109.49412 * 35.06856 * 9 8 6 11 11 C 1.53187 * 109.49948 * 275.00004 * 9 8 6 12 12 N 1.46926 * 108.79301 * 185.36196 * 11 9 8 13 13 C 1.36939 * 120.64131 * 233.68983 * 12 11 9 14 14 H 1.08004 * 119.99258 * 151.83522 * 13 12 11 15 15 C 1.38801 * 120.00491 * 331.83696 * 13 12 11 16 16 N 1.31624 * 120.00191 * 343.05834 * 15 13 12 17 17 Si 1.86796 * 120.00422 * 163.05359 * 15 13 12 18 18 H 1.48506 * 109.46910 * 59.99740 * 17 15 13 19 19 H 1.48493 * 109.47698 * 180.02562 * 17 15 13 20 20 H 1.48504 * 109.47233 * 300.00505 * 17 15 13 21 21 C 1.46940 * 118.71364 * 53.67284 * 12 11 9 22 22 C 1.53107 * 108.78359 * 306.49658 * 21 12 11 23 23 C 1.53080 * 109.47459 * 294.29914 * 22 21 12 24 24 C 1.53117 * 109.16268 * 297.01828 * 23 22 21 25 25 O 1.42902 * 109.40484 * 302.51854 * 24 23 22 26 26 C 1.42909 * 114.13368 * 61.17456 * 25 24 23 27 27 C 1.53081 * 109.46781 * 174.62992 * 22 21 12 28 28 C 1.52925 * 109.49732 * 54.46277 * 22 21 12 29 29 H 1.08995 * 109.47424 * 179.97438 * 1 2 3 30 30 H 1.09000 * 109.46852 * 300.00382 * 1 2 3 31 31 H 1.09004 * 109.46742 * 59.99677 * 1 2 3 32 32 H 1.09000 * 109.46852 * 239.99618 * 2 1 3 33 33 H 1.08996 * 109.46669 * 120.00023 * 2 1 3 34 34 H 1.08997 * 109.47264 * 60.00306 * 4 3 2 35 35 H 1.08993 * 109.47370 * 299.99504 * 4 3 2 36 36 H 1.09007 * 109.47269 * 60.00362 * 5 4 3 37 37 H 1.09000 * 109.47592 * 299.99959 * 5 4 3 38 38 H 0.97005 * 119.99600 * 0.02562 * 8 6 5 39 39 H 1.08998 * 109.58337 * 305.15780 * 11 9 8 40 40 H 1.09005 * 109.58000 * 65.56976 * 11 9 8 41 41 H 0.96995 * 120.00509 * 179.97438 * 16 15 13 42 42 H 1.09002 * 109.58643 * 66.28544 * 21 12 11 43 43 H 1.08993 * 109.58840 * 186.56516 * 21 12 11 44 44 H 1.09000 * 109.52532 * 56.92400 * 23 22 21 45 45 H 1.09001 * 109.52358 * 177.11443 * 23 22 21 46 46 H 1.08990 * 109.48485 * 182.53667 * 24 23 22 47 47 H 1.09001 * 109.47707 * 62.49480 * 24 23 22 48 48 H 1.08999 * 109.48345 * 178.83859 * 26 25 24 49 49 H 1.08997 * 109.48230 * 58.79199 * 26 25 24 50 50 H 1.09003 * 109.52393 * 182.87703 * 27 22 21 51 51 H 1.09006 * 109.52192 * 303.06879 * 27 22 21 52 52 H 1.09002 * 109.45535 * 178.81066 * 28 22 21 53 53 H 1.08994 * 109.46050 * 58.86581 * 28 22 21 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 8 2.0064 1.3472 0.0000 4 6 3.4310 1.4600 0.0006 5 6 3.8255 2.9382 -0.0001 6 6 5.3278 3.0572 0.0011 7 8 6.0153 2.0579 0.0020 8 7 5.9075 4.2739 0.0013 9 6 7.3680 4.3895 0.0020 10 1 7.7972 3.5798 -0.5882 11 6 7.8870 4.3045 1.4407 12 7 9.3355 4.5505 1.4367 13 6 10.1968 3.6572 2.0158 14 1 11.2094 3.5693 1.6508 15 6 9.7683 2.8647 3.0717 16 7 8.6767 3.1845 3.7339 17 14 10.7409 1.3443 3.5531 18 1 12.1196 1.7399 3.9378 19 1 10.0785 0.6760 4.7019 20 1 10.7977 0.4080 2.4019 21 6 9.8421 5.7735 0.7988 22 6 9.2992 5.8449 -0.6310 23 6 9.8821 4.6949 -1.4563 24 6 11.4023 4.8575 -1.5414 25 8 11.7124 6.1294 -2.1143 26 6 11.2337 7.2434 -1.3578 27 6 9.7069 7.1771 -1.2655 28 6 7.7742 5.7351 -0.6041 29 1 -0.3634 -1.0276 -0.0005 30 1 -0.3633 0.5139 0.8900 31 1 -0.3633 0.5139 -0.8900 32 1 1.8933 -0.5139 -0.8900 33 1 1.8933 -0.5138 0.8900 34 1 3.8341 0.9763 -0.8891 35 1 3.8334 0.9766 0.8908 36 1 3.4224 3.4223 0.8895 37 1 3.4232 3.4213 -0.8905 38 1 5.3577 5.0730 0.0010 39 1 7.3903 5.0569 2.0533 40 1 7.6861 3.3117 1.8435 41 1 8.3770 2.6305 4.4716 42 1 9.5063 6.6448 1.3610 43 1 10.9315 5.7501 0.7774 44 1 9.6437 3.7453 -0.9772 45 1 9.4570 4.7146 -2.4598 46 1 11.8181 4.0666 -2.1655 47 1 11.8310 4.7950 -0.5413 48 1 11.5283 8.1704 -1.8496 49 1 11.6602 7.2121 -0.3552 50 1 9.2780 7.2509 -2.2650 51 1 9.3430 8.0001 -0.6503 52 1 7.3869 5.8072 -1.6204 53 1 7.3624 6.5441 -0.0007 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 ZINC001099569493.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 06:13:18 Heat of formation + Delta-G solvation = -120.298647 kcal Electronic energy + Delta-G solvation = -31754.577842 eV Core-core repulsion = 27626.399043 eV Total energy + Delta-G solvation = -4128.178799 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 2.75 seconds Orbital eigenvalues (eV) -40.18362 -39.27811 -37.97030 -36.87618 -34.17398 -33.76847 -32.55493 -31.08793 -30.63173 -30.50928 -29.24779 -26.83954 -25.42789 -24.10863 -23.37529 -22.92407 -22.72203 -21.82483 -20.31468 -19.88711 -17.93710 -17.28930 -16.74004 -16.44270 -15.98316 -15.84593 -15.64230 -15.37752 -15.11100 -14.75789 -14.55456 -14.28622 -14.07812 -13.84446 -13.65498 -13.57131 -13.26436 -12.79347 -12.53679 -12.39600 -12.33684 -12.08301 -12.06380 -11.82734 -11.76530 -11.20988 -11.16631 -11.12045 -11.09576 -10.92380 -10.76224 -10.70336 -10.45673 -10.27787 -10.15955 -10.05652 -9.73489 -9.66350 -9.49625 -9.39236 -8.96232 -8.56631 -8.44623 -6.69086 -5.79517 -3.23521 3.00006 3.19055 3.40144 3.46282 3.48236 3.92664 4.19151 4.49757 4.85357 4.87335 4.96119 5.00282 5.06389 5.09919 5.15810 5.17615 5.27668 5.37094 5.41493 5.46972 5.50044 5.54726 5.61626 5.66759 5.68747 5.69994 5.77453 5.80387 5.85614 5.88156 5.92024 5.93589 6.03145 6.10637 6.16955 6.21873 6.28825 6.43208 6.51295 6.66921 6.72594 6.77373 6.85253 6.92664 7.10441 7.25111 7.52119 7.68269 7.78645 7.90093 8.43289 8.61876 9.18490 9.82286 10.37078 11.28297 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.009798 B = 0.003410 C = 0.002733 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2856.948458 B = 8210.279480 C =10242.502808 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.150 4.150 2 C 0.058 3.942 3 O -0.395 6.395 4 C 0.078 3.922 5 C -0.138 4.138 6 C 0.514 3.486 7 O -0.535 6.535 8 N -0.720 5.720 9 C 0.115 3.885 10 H 0.086 0.914 11 C 0.167 3.833 12 N -0.582 5.582 13 C -0.257 4.257 14 H 0.065 0.935 15 C 0.010 3.990 16 N -0.898 5.898 17 Si 0.900 3.100 18 H -0.283 1.283 19 H -0.291 1.291 20 H -0.282 1.282 21 C 0.151 3.849 22 C -0.072 4.072 23 C -0.136 4.136 24 C 0.061 3.939 25 O -0.391 6.391 26 C 0.061 3.939 27 C -0.140 4.140 28 C -0.104 4.104 29 H 0.069 0.931 30 H 0.062 0.938 31 H 0.061 0.939 32 H 0.048 0.952 33 H 0.049 0.951 34 H 0.057 0.943 35 H 0.060 0.940 36 H 0.099 0.901 37 H 0.096 0.904 38 H 0.393 0.607 39 H 0.016 0.984 40 H 0.095 0.905 41 H 0.254 0.746 42 H 0.018 0.982 43 H 0.058 0.942 44 H 0.090 0.910 45 H 0.055 0.945 46 H 0.085 0.915 47 H 0.060 0.940 48 H 0.085 0.915 49 H 0.053 0.947 50 H 0.064 0.936 51 H 0.069 0.931 52 H 0.052 0.948 53 H 0.060 0.940 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -9.681 3.606 -10.085 14.437 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 -0.208 4.208 2 C -0.019 4.019 3 O -0.315 6.315 4 C 0.001 3.999 5 C -0.178 4.178 6 C 0.299 3.701 7 O -0.412 6.412 8 N -0.371 5.371 9 C 0.010 3.990 10 H 0.104 0.896 11 C 0.040 3.960 12 N -0.304 5.304 13 C -0.387 4.387 14 H 0.083 0.917 15 C -0.190 4.190 16 N -0.541 5.541 17 Si 0.730 3.270 18 H -0.209 1.209 19 H -0.217 1.217 20 H -0.208 1.208 21 C 0.025 3.975 22 C -0.075 4.075 23 C -0.174 4.174 24 C -0.016 4.016 25 O -0.310 6.310 26 C -0.015 4.015 27 C -0.178 4.178 28 C -0.142 4.142 29 H 0.088 0.912 30 H 0.081 0.919 31 H 0.080 0.920 32 H 0.066 0.934 33 H 0.067 0.933 34 H 0.075 0.925 35 H 0.078 0.922 36 H 0.118 0.882 37 H 0.115 0.885 38 H 0.226 0.774 39 H 0.034 0.966 40 H 0.113 0.887 41 H 0.064 0.936 42 H 0.036 0.964 43 H 0.076 0.924 44 H 0.108 0.892 45 H 0.073 0.927 46 H 0.104 0.896 47 H 0.078 0.922 48 H 0.103 0.897 49 H 0.071 0.929 50 H 0.083 0.917 51 H 0.088 0.912 52 H 0.071 0.929 53 H 0.079 0.921 Dipole moment (debyes) X Y Z Total from point charges -9.247 2.953 -10.072 13.988 hybrid contribution 0.038 -0.577 0.635 0.859 sum -9.209 2.376 -9.438 13.398 Atomic orbital electron populations 1.21744 0.93870 1.02129 1.03022 1.22431 0.95315 0.83800 1.00324 1.87782 1.21513 1.26575 1.95611 1.22123 0.80176 0.95701 1.01877 1.21460 0.93258 0.97880 1.05202 1.20251 0.89617 0.83773 0.76458 1.90754 1.65144 1.36265 1.49041 1.46039 1.08425 1.07492 1.75099 1.22026 0.77784 0.97356 1.01859 0.89647 1.21097 0.83298 1.02510 0.89104 1.43884 1.02120 1.19449 1.64968 1.19033 0.95029 1.14336 1.10262 0.91745 1.25014 0.97953 1.00374 0.95621 1.69998 1.25045 1.37986 1.21066 0.86408 0.79297 0.83530 0.77767 1.20893 1.21651 1.20850 1.21072 0.97277 0.89924 0.89240 1.20995 0.94432 0.93911 0.98125 1.22127 0.95631 1.00467 0.99134 1.22636 0.95422 0.84639 0.98877 1.87841 1.78249 1.14429 1.50498 1.22536 0.93451 0.89294 0.96267 1.22171 0.96786 0.97913 1.00965 1.21678 0.95690 0.97149 0.99651 0.91199 0.91860 0.91961 0.93405 0.93253 0.92521 0.92176 0.88217 0.88543 0.77392 0.96555 0.88716 0.93584 0.96398 0.92404 0.89169 0.92658 0.89638 0.92177 0.89703 0.92869 0.91732 0.91234 0.92914 0.92137 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 17. 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 -1.21 10.28 37.16 0.38 -0.83 16 2 C 0.06 0.59 6.66 37.16 0.25 0.84 16 3 O -0.39 -5.02 10.34 -35.23 -0.36 -5.39 16 4 C 0.08 1.05 5.23 37.16 0.19 1.24 16 5 C -0.14 -1.72 6.07 -27.88 -0.17 -1.89 16 6 C 0.51 8.55 7.80 -10.99 -0.09 8.46 16 7 O -0.54 -11.44 15.65 5.55 0.09 -11.36 16 8 N -0.72 -11.13 5.08 -53.68 -0.27 -11.41 16 9 C 0.11 2.12 2.27 -67.80 -0.15 1.97 16 10 H 0.09 1.80 5.87 -51.93 -0.30 1.50 16 11 C 0.17 3.88 4.88 -3.71 -0.02 3.87 16 12 N -0.58 -13.87 2.40 -172.37 -0.41 -14.28 16 13 C -0.26 -6.87 9.58 -15.06 -0.14 -7.01 16 14 H 0.06 1.68 7.89 -52.48 -0.41 1.27 16 15 C 0.01 0.27 4.92 -17.43 -0.09 0.19 16 16 N -0.90 -26.07 11.20 55.49 0.62 -25.45 16 17 Si 0.90 22.06 29.59 -169.99 -5.03 17.03 16 18 H -0.28 -6.77 7.11 56.52 0.40 -6.36 16 19 H -0.29 -7.20 7.11 56.52 0.40 -6.80 16 20 H -0.28 -6.94 7.11 56.52 0.40 -6.54 16 21 C 0.15 2.97 4.60 -3.75 -0.02 2.95 16 22 C -0.07 -1.16 0.52 -154.41 -0.08 -1.24 16 23 C -0.14 -2.26 4.37 -26.63 -0.12 -2.38 16 24 C 0.06 0.97 6.57 37.22 0.24 1.21 16 25 O -0.39 -6.14 10.76 -35.23 -0.38 -6.52 16 26 C 0.06 0.83 6.57 37.21 0.24 1.07 16 27 C -0.14 -1.87 4.92 -26.63 -0.13 -2.00 16 28 C -0.10 -1.60 4.19 -26.74 -0.11 -1.71 16 29 H 0.07 0.44 8.14 -51.93 -0.42 0.01 16 30 H 0.06 0.52 8.14 -51.93 -0.42 0.10 16 31 H 0.06 0.49 8.14 -51.93 -0.42 0.07 16 32 H 0.05 0.45 8.14 -51.93 -0.42 0.03 16 33 H 0.05 0.49 8.14 -51.93 -0.42 0.07 16 34 H 0.06 0.77 8.10 -51.93 -0.42 0.35 16 35 H 0.06 0.88 8.10 -51.93 -0.42 0.46 16 36 H 0.10 1.14 8.14 -51.92 -0.42 0.71 16 37 H 0.10 0.98 8.14 -51.93 -0.42 0.56 16 38 H 0.39 4.68 8.60 -40.82 -0.35 4.33 16 39 H 0.02 0.40 8.14 -51.93 -0.42 -0.02 16 40 H 0.09 2.63 6.06 -51.93 -0.31 2.32 16 41 H 0.25 7.25 8.31 -40.82 -0.34 6.91 16 42 H 0.02 0.36 8.14 -51.93 -0.42 -0.06 16 43 H 0.06 1.14 4.85 -51.93 -0.25 0.89 16 44 H 0.09 1.76 6.11 -51.93 -0.32 1.45 16 45 H 0.05 0.87 8.14 -51.93 -0.42 0.44 16 46 H 0.09 1.25 8.14 -51.93 -0.42 0.83 16 47 H 0.06 1.04 6.48 -51.93 -0.34 0.70 16 48 H 0.08 0.95 8.14 -51.93 -0.42 0.53 16 49 H 0.05 0.74 6.73 -51.93 -0.35 0.39 16 50 H 0.06 0.82 8.14 -51.93 -0.42 0.40 16 51 H 0.07 0.85 8.14 -51.93 -0.42 0.43 16 52 H 0.05 0.73 8.14 -51.93 -0.42 0.31 16 53 H 0.06 0.89 8.14 -51.93 -0.42 0.47 16 LS Contribution 403.12 15.07 6.07 6.07 Total: -1.00 -31.98 403.12 -8.86 -40.84 By element: Atomic # 1 Polarization: 15.11 SS G_CDS: -9.38 Total: 5.73 kcal Atomic # 6 Polarization: 4.53 SS G_CDS: 0.20 Total: 4.73 kcal Atomic # 7 Polarization: -51.08 SS G_CDS: -0.06 Total: -51.14 kcal Atomic # 8 Polarization: -22.60 SS G_CDS: -0.66 Total: -23.26 kcal Atomic # 14 Polarization: 22.06 SS G_CDS: -5.03 Total: 17.03 kcal Total LS contribution 6.07 Total: 6.07 kcal Total: -31.98 -8.86 -40.84 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. ZINC001099569493.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 -79.462 kcal (2) G-P(sol) polarization free energy of solvation -31.981 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -111.442 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.856 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.837 kcal (6) G-S(sol) free energy of system = (1) + (5) -120.299 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 2.75 seconds