Wall clock time and date at job start Tue Mar 31 2020 14:09:57 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 1.46905 * 1 3 3 C 1.46904 * 110.99685 * 2 1 4 4 C 1.46899 * 110.99866 * 123.95071 * 2 1 3 5 5 H 1.08990 * 109.47325 * 55.00385 * 4 2 1 6 6 C 1.53007 * 109.47071 * 294.99977 * 4 2 1 7 7 C 1.52999 * 109.46946 * 180.02562 * 6 4 2 8 8 C 1.53003 * 109.46917 * 60.00202 * 7 6 4 9 9 C 1.53001 * 109.47453 * 299.99643 * 8 7 6 10 10 H 1.08993 * 109.47065 * 179.97438 * 9 8 7 11 11 C 1.50698 * 109.47207 * 300.00575 * 9 8 7 12 12 O 1.21283 * 120.00472 * 119.99880 * 11 9 8 13 13 N 1.34777 * 119.99538 * 299.99218 * 11 9 8 14 14 C 1.46499 * 119.99665 * 179.72653 * 13 11 9 15 15 C 1.53004 * 109.47198 * 180.27868 * 14 13 11 16 16 H 1.08996 * 112.84823 * 316.19572 * 15 14 13 17 17 C 1.53787 * 113.61355 * 87.50373 * 15 14 13 18 18 C 1.53783 * 87.08023 * 139.98452 * 17 15 14 19 19 H 1.08994 * 113.69222 * 89.12103 * 18 17 15 20 20 N 1.46498 * 113.61081 * 220.02115 * 18 17 15 21 21 C 1.36939 * 119.99843 * 252.49331 * 20 18 17 22 22 H 1.08005 * 119.99431 * 0.02562 * 21 20 18 23 23 C 1.38807 * 120.00411 * 179.97438 * 21 20 18 24 24 N 1.31621 * 119.99762 * 0.02562 * 23 21 20 25 25 Si 1.86803 * 120.00391 * 180.02562 * 23 21 20 26 26 H 1.48502 * 109.46732 * 60.00138 * 25 23 21 27 27 H 1.48491 * 109.47201 * 179.97438 * 25 23 21 28 28 H 1.48495 * 109.46903 * 300.00432 * 25 23 21 29 29 C 1.53782 * 113.61417 * 185.00090 * 15 14 13 30 30 C 1.52999 * 109.46768 * 60.00265 * 9 8 7 31 31 H 1.08998 * 109.47204 * 296.04822 * 1 2 3 32 32 H 1.09004 * 109.46987 * 56.05007 * 1 2 3 33 33 H 1.09001 * 109.46841 * 176.04496 * 1 2 3 34 34 H 1.09001 * 109.46807 * 183.95582 * 3 2 1 35 35 H 1.09000 * 109.46911 * 303.95296 * 3 2 1 36 36 H 1.08998 * 109.47487 * 63.95285 * 3 2 1 37 37 H 1.08993 * 109.46794 * 60.00258 * 6 4 2 38 38 H 1.08998 * 109.47247 * 300.00624 * 6 4 2 39 39 H 1.09003 * 109.47160 * 300.00341 * 7 6 4 40 40 H 1.08995 * 109.47276 * 180.02562 * 7 6 4 41 41 H 1.09001 * 109.46873 * 179.97438 * 8 7 6 42 42 H 1.08995 * 109.47229 * 60.00344 * 8 7 6 43 43 H 0.97001 * 120.00485 * 0.02562 * 13 11 9 44 44 H 1.09009 * 109.47454 * 300.27637 * 14 13 11 45 45 H 1.08998 * 109.47492 * 60.27932 * 14 13 11 46 46 H 1.08998 * 113.61128 * 254.53330 * 17 15 14 47 47 H 1.08998 * 113.61325 * 25.42994 * 17 15 14 48 48 H 0.97001 * 120.00513 * 72.49254 * 20 18 17 49 49 H 0.97002 * 120.00270 * 179.97438 * 24 23 21 50 50 H 1.09001 * 113.61616 * 334.56263 * 29 15 14 51 51 H 1.08993 * 113.61391 * 105.46950 * 29 15 14 52 52 H 1.08998 * 109.47611 * 59.99921 * 30 9 8 53 53 H 1.09000 * 109.47527 * 180.02562 * 30 9 8 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 1.4690 0.0000 0.0000 3 6 1.9954 1.3715 0.0000 4 6 1.9955 -0.7659 1.1376 5 1 1.5755 -1.7716 1.1241 6 6 1.6091 -0.0693 2.4440 7 6 2.1579 -0.8667 3.6288 8 6 3.6823 -0.9487 3.5261 9 6 4.0687 -1.6453 2.2198 10 1 5.1546 -1.7032 2.1464 11 6 3.4884 -3.0359 2.2013 12 8 2.7124 -3.3577 1.3266 13 7 3.8320 -3.9222 3.1568 14 6 3.2633 -5.2722 3.1422 15 6 3.8079 -6.0679 4.3303 16 1 4.8797 -5.9324 4.4748 17 6 2.9840 -5.8947 5.6172 18 6 3.1951 -7.3983 5.8611 19 1 4.0988 -7.6279 6.4255 20 7 2.0087 -8.0801 6.3844 21 6 1.9741 -8.4878 7.6912 22 1 2.8212 -8.3064 8.3361 23 6 0.8498 -9.1333 8.1874 24 7 -0.1828 -9.3540 7.4016 25 14 0.8023 -9.6889 9.9702 26 1 0.9615 -8.5108 10.8602 27 1 -0.4993 -10.3469 10.2491 28 1 1.9067 -10.6499 10.2188 29 6 3.3664 -7.5409 4.3394 30 6 3.5199 -0.8479 1.0349 31 1 -0.3633 0.4513 0.9233 32 1 -0.3633 0.5739 -0.8525 33 1 -0.3633 -1.0252 -0.0709 34 1 3.0828 1.3433 -0.0709 35 1 1.5897 1.9163 -0.8525 36 1 1.7044 1.8724 0.9232 37 1 0.5232 -0.0105 2.5169 38 1 2.0290 0.9364 2.4575 39 1 1.7382 -1.8726 3.6154 40 1 1.8823 -0.3708 4.5594 41 1 4.0733 -1.5164 4.3704 42 1 4.1019 0.0571 3.5395 43 1 4.4525 -3.6648 3.8566 44 1 2.1774 -5.2098 3.2139 45 1 3.5380 -5.7723 2.2135 46 1 3.4650 -5.2599 6.3614 47 1 1.9439 -5.6233 5.4366 48 1 1.2477 -8.2427 5.8053 49 1 -0.9683 -9.8054 7.7481 50 1 2.4307 -7.7196 3.8096 51 1 4.1560 -8.2351 4.0521 52 1 3.9395 0.1580 1.0483 53 1 3.7948 -1.3443 0.1043 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). 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 ZINC001086253873.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 14:09:57 Heat of formation + Delta-G solvation = -13.752174 kcal Electronic energy + Delta-G solvation = -28290.122468 eV Core-core repulsion = 24582.964725 eV Total energy + Delta-G solvation = -3707.157744 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 323.231 amu Computer time = 0.85 seconds Orbital eigenvalues (eV) -40.87113 -38.97331 -38.16216 -35.70587 -34.69725 -33.28405 -31.32793 -30.37939 -29.76034 -27.85480 -27.29452 -25.09623 -24.64866 -24.05302 -23.13121 -22.05852 -21.05070 -20.41270 -19.57650 -18.87374 -17.06982 -16.70310 -16.57539 -16.03444 -15.39868 -15.27632 -14.92537 -14.81390 -14.71868 -14.55049 -14.18954 -13.83246 -13.54687 -13.47238 -13.14525 -12.96439 -12.55033 -12.43736 -12.33764 -12.19943 -11.90921 -11.88931 -11.81181 -11.66876 -11.39316 -11.24971 -11.15717 -10.92545 -10.83190 -10.68983 -10.53298 -10.42631 -10.21056 -10.14386 -9.83116 -9.59509 -9.42344 -8.96726 -8.86770 -8.40371 -6.97246 -5.78998 -3.07965 2.62787 3.18084 3.42189 3.46621 3.47861 3.74701 4.41535 4.45586 4.53741 4.57421 4.75078 4.83728 4.93924 4.97123 5.00208 5.05482 5.07951 5.17914 5.21901 5.25284 5.25593 5.32606 5.34388 5.45961 5.50081 5.51468 5.55331 5.66301 5.70254 5.75118 5.78063 5.83240 5.85775 5.90894 5.94193 5.96321 6.08455 6.08833 6.22722 6.28901 6.33124 6.36228 6.49410 6.58974 6.82554 6.90212 6.92758 7.10784 7.50614 7.67393 8.24156 8.39580 9.50429 10.08910 10.43031 11.43297 Molecular weight = 323.23amu Principal moments of inertia in cm(-1) A = 0.019894 B = 0.002242 C = 0.002170 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1407.120060 B =12486.955028 C =12897.872487 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.022 3.978 2 N -0.538 5.538 3 C 0.016 3.984 4 C 0.072 3.928 5 H 0.114 0.886 6 C -0.153 4.153 7 C -0.119 4.119 8 C -0.110 4.110 9 C -0.108 4.108 10 H 0.097 0.903 11 C 0.515 3.485 12 O -0.535 6.535 13 N -0.725 5.725 14 C 0.132 3.868 15 C -0.127 4.127 16 H 0.087 0.913 17 C -0.160 4.160 18 C 0.166 3.834 19 H 0.075 0.925 20 N -0.713 5.713 21 C -0.245 4.245 22 H 0.070 0.930 23 C -0.013 4.013 24 N -0.932 5.932 25 Si 0.907 3.093 26 H -0.286 1.286 27 H -0.291 1.291 28 H -0.286 1.286 29 C -0.143 4.143 30 C -0.089 4.089 31 H 0.027 0.973 32 H 0.064 0.936 33 H 0.069 0.931 34 H 0.069 0.931 35 H 0.062 0.938 36 H 0.027 0.973 37 H 0.062 0.938 38 H 0.062 0.938 39 H 0.065 0.935 40 H 0.065 0.935 41 H 0.069 0.931 42 H 0.072 0.928 43 H 0.399 0.601 44 H 0.068 0.932 45 H 0.063 0.937 46 H 0.053 0.947 47 H 0.077 0.923 48 H 0.385 0.615 49 H 0.256 0.744 50 H 0.080 0.920 51 H 0.061 0.939 52 H 0.066 0.934 53 H 0.076 0.924 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 9.569 22.020 -12.838 27.226 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 -0.126 4.126 2 N -0.260 5.260 3 C -0.133 4.133 4 C -0.036 4.036 5 H 0.132 0.868 6 C -0.192 4.192 7 C -0.157 4.157 8 C -0.148 4.148 9 C -0.130 4.130 10 H 0.116 0.884 11 C 0.301 3.699 12 O -0.412 6.412 13 N -0.376 5.376 14 C 0.009 3.991 15 C -0.146 4.146 16 H 0.105 0.895 17 C -0.201 4.201 18 C 0.054 3.946 19 H 0.093 0.907 20 N -0.351 5.351 21 C -0.376 4.376 22 H 0.088 0.912 23 C -0.209 4.209 24 N -0.580 5.580 25 Si 0.738 3.262 26 H -0.213 1.213 27 H -0.217 1.217 28 H -0.212 1.212 29 C -0.182 4.182 30 C -0.127 4.127 31 H 0.045 0.955 32 H 0.083 0.917 33 H 0.088 0.912 34 H 0.087 0.913 35 H 0.081 0.919 36 H 0.046 0.954 37 H 0.080 0.920 38 H 0.080 0.920 39 H 0.084 0.916 40 H 0.084 0.916 41 H 0.088 0.912 42 H 0.091 0.909 43 H 0.232 0.768 44 H 0.086 0.914 45 H 0.081 0.919 46 H 0.071 0.929 47 H 0.096 0.904 48 H 0.219 0.781 49 H 0.066 0.934 50 H 0.099 0.901 51 H 0.080 0.920 52 H 0.085 0.915 53 H 0.095 0.905 Dipole moment (debyes) X Y Z Total from point charges 9.139 21.452 -13.722 27.056 hybrid contribution -0.319 0.240 1.947 1.987 sum 8.820 21.692 -11.776 26.210 Atomic orbital electron populations 1.22388 0.87590 1.02459 1.00147 1.62233 1.07764 1.13284 1.42737 1.22477 1.00931 0.89642 1.00215 1.22122 0.95349 0.99411 0.86681 0.86840 1.22243 1.00883 0.99728 0.96379 1.21490 0.95080 1.01059 0.98060 1.21544 0.96711 1.00960 0.95569 1.21391 1.01434 0.92561 0.97627 0.88445 1.20564 0.81446 0.86592 0.81281 1.90650 1.34998 1.79069 1.36513 1.46097 1.48280 1.13595 1.29629 1.21417 0.98385 0.80872 0.98435 1.22634 0.99585 0.97054 0.95330 0.89461 1.23936 0.99338 1.01816 0.94999 1.21521 0.91671 0.90288 0.91169 0.90717 1.42408 1.14786 1.67578 1.10285 1.19255 1.00174 1.30691 0.87477 0.91174 1.24772 0.96544 1.01488 0.98123 1.69651 1.05930 1.47446 1.34996 0.86265 0.76734 0.78404 0.84762 1.21264 1.21678 1.21227 1.23449 1.01093 0.93652 1.00049 1.21352 0.94892 0.99147 0.97276 0.95496 0.91708 0.91219 0.91278 0.91879 0.95433 0.91973 0.91956 0.91604 0.91612 0.91218 0.90896 0.76753 0.91368 0.91852 0.92863 0.90415 0.78067 0.93387 0.90138 0.92041 0.91541 0.90507 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. 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 0.02 0.21 9.31 60.07 0.56 0.77 16 2 N -0.54 -5.45 5.01 -243.16 -1.22 -6.67 16 3 C 0.02 0.12 8.82 60.07 0.53 0.65 16 4 C 0.07 0.76 1.94 -67.70 -0.13 0.63 16 5 H 0.11 1.56 5.50 -51.93 -0.29 1.28 16 6 C -0.15 -1.41 4.51 -26.73 -0.12 -1.53 16 7 C -0.12 -1.08 5.70 -26.73 -0.15 -1.23 16 8 C -0.11 -0.80 5.35 -26.73 -0.14 -0.95 16 9 C -0.11 -0.91 3.01 -91.77 -0.28 -1.18 16 10 H 0.10 0.63 8.14 -51.93 -0.42 0.21 16 11 C 0.51 5.98 5.64 -10.99 -0.06 5.92 16 12 O -0.54 -8.25 13.66 5.55 0.08 -8.17 16 13 N -0.72 -7.69 5.45 -60.29 -0.33 -8.02 16 14 C 0.13 1.69 5.51 -4.04 -0.02 1.67 16 15 C -0.13 -1.65 3.76 -89.80 -0.34 -1.98 16 16 H 0.09 0.98 8.14 -51.93 -0.42 0.56 16 17 C -0.16 -2.58 7.43 -25.91 -0.19 -2.77 16 18 C 0.17 3.16 4.48 -67.11 -0.30 2.86 16 19 H 0.07 1.41 8.10 -51.93 -0.42 0.99 16 20 N -0.71 -17.70 5.40 -52.63 -0.28 -17.98 16 21 C -0.24 -6.74 9.97 -15.06 -0.15 -6.89 16 22 H 0.07 1.86 7.83 -52.48 -0.41 1.45 16 23 C -0.01 -0.38 5.50 -17.43 -0.10 -0.47 16 24 N -0.93 -28.15 13.06 55.49 0.72 -27.42 16 25 Si 0.91 22.25 29.55 -169.99 -5.02 17.23 16 26 H -0.29 -6.89 7.11 56.52 0.40 -6.49 16 27 H -0.29 -7.20 7.11 56.52 0.40 -6.80 16 28 H -0.29 -6.87 7.11 56.52 0.40 -6.47 16 29 C -0.14 -2.25 7.39 -25.91 -0.19 -2.44 16 30 C -0.09 -0.82 4.17 -26.73 -0.11 -0.93 16 31 H 0.03 0.24 6.44 -51.93 -0.33 -0.10 16 32 H 0.06 0.52 8.12 -51.93 -0.42 0.09 16 33 H 0.07 0.70 8.14 -51.93 -0.42 0.27 16 34 H 0.07 0.50 6.32 -51.93 -0.33 0.17 16 35 H 0.06 0.45 8.12 -51.93 -0.42 0.03 16 36 H 0.03 0.21 6.28 -51.93 -0.33 -0.12 16 37 H 0.06 0.61 6.52 -51.93 -0.34 0.27 16 38 H 0.06 0.52 6.39 -51.93 -0.33 0.19 16 39 H 0.07 0.75 7.22 -51.93 -0.37 0.37 16 40 H 0.07 0.55 8.14 -51.93 -0.42 0.13 16 41 H 0.07 0.46 7.57 -51.93 -0.39 0.06 16 42 H 0.07 0.44 8.14 -51.93 -0.42 0.02 16 43 H 0.40 3.29 7.89 -40.82 -0.32 2.97 16 44 H 0.07 1.01 7.84 -51.92 -0.41 0.60 16 45 H 0.06 0.84 8.14 -51.93 -0.42 0.42 16 46 H 0.05 0.81 8.14 -51.93 -0.42 0.39 16 47 H 0.08 1.40 7.90 -51.93 -0.41 0.99 16 48 H 0.39 10.22 7.92 -40.82 -0.32 9.90 16 49 H 0.26 7.51 8.31 -40.82 -0.34 7.17 16 50 H 0.08 1.34 8.08 -51.93 -0.42 0.92 16 51 H 0.06 0.90 8.14 -51.93 -0.42 0.48 16 52 H 0.07 0.51 6.42 -51.93 -0.33 0.17 16 53 H 0.08 0.83 8.10 -51.93 -0.42 0.41 16 LS Contribution 397.93 15.07 6.00 6.00 Total: -1.00 -31.61 397.93 -10.80 -42.40 By element: Atomic # 1 Polarization: 20.06 SS G_CDS: -9.54 Total: 10.52 kcal Atomic # 6 Polarization: -6.69 SS G_CDS: -1.20 Total: -7.89 kcal Atomic # 7 Polarization: -58.98 SS G_CDS: -1.11 Total: -60.09 kcal Atomic # 8 Polarization: -8.25 SS G_CDS: 0.08 Total: -8.17 kcal Atomic # 14 Polarization: 22.25 SS G_CDS: -5.02 Total: 17.23 kcal Total LS contribution 6.00 Total: 6.00 kcal Total: -31.61 -10.80 -42.40 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. ZINC001086253873.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 28.652 kcal (2) G-P(sol) polarization free energy of solvation -31.608 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -2.956 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.796 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.404 kcal (6) G-S(sol) free energy of system = (1) + (5) -13.752 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.85 seconds