Wall clock time and date at job start Tue Mar 9 2021 13:38:19 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= 0 * 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 O 1.42898 * 1 3 3 C 1.35993 * 116.99715 * 2 1 4 4 C 1.39160 * 120.06965 * 180.02562 * 3 2 1 5 5 O 1.35995 * 120.07175 * 359.95626 * 4 3 2 6 6 C 1.42903 * 116.99587 * 180.02562 * 5 4 3 7 7 C 1.50701 * 109.46878 * 180.02562 * 6 5 4 8 8 O 1.21280 * 119.99781 * 0.02562 * 7 6 5 9 9 N 1.34780 * 119.99795 * 179.97438 * 7 6 5 10 10 C 1.46497 * 119.99566 * 180.02562 * 9 7 6 11 11 H 1.09003 * 112.85441 * 23.80863 * 10 9 7 12 12 C 1.53785 * 113.61126 * 155.00450 * 10 9 7 13 13 C 1.53779 * 87.08111 * 89.11843 * 12 10 9 14 14 H 1.09006 * 113.61169 * 270.88392 * 13 12 10 15 15 C 1.53003 * 113.61606 * 139.98419 * 13 12 10 16 16 N 1.47316 * 110.59598 * 294.17157 * 15 13 12 17 17 C 1.34525 * 106.61509 * 241.47637 * 16 15 13 18 18 O 1.21538 * 123.76848 * 179.97438 * 17 16 15 19 19 N 1.33799 * 112.45937 * 359.97438 * 17 16 15 20 20 C 1.34762 * 111.64156 * 0.02562 * 19 17 16 21 21 O 1.21236 * 127.15406 * 180.02562 * 20 19 17 22 22 C 1.53781 * 87.08464 * 25.43144 * 13 12 10 23 23 C 1.38563 * 119.85324 * 180.23907 * 4 3 2 24 24 C 1.38251 * 119.99789 * 359.48293 * 23 4 3 25 25 N 1.48000 * 119.92494 * 180.25415 * 24 23 4 26 26 O 1.21796 * 120.00413 * 0.26391 * 25 24 23 27 27 O 1.21802 * 120.00082 * 180.25891 * 25 24 23 28 28 C 1.38247 * 120.14512 * 0.51906 * 24 23 4 29 29 C 1.50699 * 119.92757 * 179.76007 * 28 24 23 30 30 O 1.42907 * 109.47034 * 74.97720 * 29 28 24 31 31 Si 1.86301 * 109.47495 * 194.97865 * 29 28 24 32 32 C 1.38240 * 120.14958 * 359.74175 * 28 24 23 33 33 H 1.09004 * 109.47097 * 299.99344 * 1 2 3 34 34 H 1.09000 * 109.47726 * 59.99385 * 1 2 3 35 35 H 1.08999 * 109.47233 * 179.97438 * 1 2 3 36 36 H 1.09002 * 109.47382 * 60.00075 * 6 5 4 37 37 H 1.09001 * 109.46938 * 300.00061 * 6 5 4 38 38 H 0.96995 * 120.00011 * 0.02562 * 9 7 6 39 39 H 1.09001 * 113.60931 * 203.66519 * 12 10 9 40 40 H 1.08994 * 113.61149 * 334.47869 * 12 10 9 41 41 H 1.09002 * 110.53117 * 57.16426 * 15 13 12 42 42 H 0.96992 * 126.69336 * 61.44451 * 16 15 13 43 43 H 0.97002 * 124.17587 * 179.97438 * 19 17 16 44 44 H 1.08992 * 113.61652 * 220.02349 * 22 13 12 45 45 H 1.09001 * 113.61195 * 89.11588 * 22 13 12 46 46 H 1.07998 * 120.00324 * 179.72425 * 23 4 3 47 47 H 1.08999 * 109.47191 * 314.98171 * 29 28 24 48 48 H 0.96698 * 113.99810 * 179.97438 * 30 29 28 49 49 H 1.48508 * 109.99760 * 300.00237 * 31 29 28 50 50 H 1.48501 * 110.00029 * 61.31739 * 31 29 28 51 51 H 1.08000 * 120.00666 * 179.97438 * 32 28 24 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 8 1.4290 0.0000 0.0000 3 6 2.0463 1.2117 0.0000 4 6 3.4359 1.2863 -0.0005 5 8 4.1795 0.1476 -0.0002 6 6 5.6003 0.3007 -0.0002 7 6 6.2518 -1.0582 -0.0004 8 8 5.5669 -2.0591 -0.0010 9 7 7.5957 -1.1611 -0.0010 10 6 8.2290 -2.4821 -0.0017 11 1 7.5832 -3.2610 -0.4072 12 6 9.6467 -2.4852 -0.5977 13 6 10.1585 -2.1818 0.8203 14 1 10.2148 -1.1168 1.0457 15 6 11.4392 -2.9359 1.1841 16 7 11.1860 -4.3857 1.2497 17 6 11.4535 -4.7661 2.5120 18 8 11.3462 -5.9094 2.9101 19 7 11.8508 -3.7452 3.2803 20 6 11.8821 -2.5875 2.5912 21 8 12.1992 -1.4947 3.0096 22 6 8.8780 -2.8550 1.3417 23 6 4.0603 2.5233 0.0045 24 6 3.3028 3.6799 -0.0008 25 7 3.9714 5.0003 -0.0011 26 8 5.1875 5.0672 -0.0016 27 8 3.3055 6.0201 -0.0010 28 6 1.9224 3.6057 -0.0003 29 6 1.1016 4.8696 -0.0006 30 8 1.1345 5.4587 -1.3022 31 14 -0.6595 4.4665 0.4542 32 6 1.2932 2.3748 0.0002 33 1 -0.3633 0.5138 0.8901 34 1 -0.3634 0.5139 -0.8899 35 1 -0.3633 -1.0276 -0.0005 36 1 5.9065 0.8508 0.8896 37 1 5.9065 0.8502 -0.8904 38 1 8.1434 -0.3606 -0.0009 39 1 9.9592 -3.4586 -0.9758 40 1 9.8230 -1.6784 -1.3090 41 1 12.2300 -2.7144 0.4674 42 1 10.8847 -4.9548 0.5244 43 1 12.0864 -3.8281 4.2176 44 1 8.4342 -2.3457 2.1971 45 1 8.9804 -3.9294 1.4939 46 1 5.1385 2.5840 0.0086 47 1 1.5131 5.5703 0.7258 48 1 0.6257 6.2776 -1.3762 49 1 -1.2322 3.5119 -0.5287 50 1 -0.7108 3.8825 1.8186 51 1 0.2146 2.3196 0.0010 There are 80 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 80 No. of singly occupied orbitals= 1 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=0 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 s_22_17522896_4549636.mol2 51 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 9 2021 13:38:19 Heat of formation + Delta-G solvation = -96.293833 kcal Electronic energy + Delta-G solvation = -42968.230368 eV Core-core repulsion = 37035.049257 eV Total energy + Delta-G solvation = -5933.181111 eV No. of doubly occupied orbitals = 80 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 437.150 amu Computer time = 1.52 seconds Orbital eigenvalues (eV) -43.69311 -43.26950 -42.16909 -41.44897 -40.26744 -39.74330 -39.36878 -39.01774 -37.61930 -37.17929 -37.08388 -35.27158 -34.12078 -32.83480 -32.61476 -30.48729 -29.47874 -28.99320 -27.88802 -27.15888 -25.91741 -25.25841 -24.09575 -23.83667 -23.12137 -22.73563 -22.20873 -20.81085 -20.59871 -19.73927 -19.54891 -19.38187 -18.81944 -18.78838 -18.26103 -18.18620 -18.09572 -17.89425 -17.86645 -17.69096 -17.26144 -17.04919 -17.02897 -16.71366 -16.59333 -16.08621 -15.87683 -15.71202 -15.61828 -15.44441 -15.41108 -15.13839 -14.89196 -14.72093 -14.35597 -14.19809 -14.03880 -13.85844 -13.60863 -13.48182 -13.12528 -12.82276 -12.72081 -12.62773 -12.50257 -12.42401 -12.38905 -12.27031 -11.98081 -11.97774 -11.87154 -11.79626 -11.51532 -11.33206 -11.13792 -10.69267 -10.59848 -10.40200 -10.30438 -9.57070 -5.20882 -1.24045 -0.54241 0.29726 0.39935 0.41562 1.00487 1.03377 1.25505 1.25930 1.39360 1.64837 1.67059 1.82733 1.86331 1.91081 2.11686 2.67683 2.79847 3.00647 3.02412 3.10933 3.17188 3.26792 3.29869 3.35745 3.42407 3.58223 3.60639 3.64847 3.75722 3.80216 3.82336 3.87279 3.87741 3.90277 4.12060 4.12492 4.20519 4.31829 4.32336 4.32894 4.48849 4.55911 4.57896 4.62699 4.66562 4.75439 4.87969 5.20666 5.38832 5.44597 5.53899 5.73765 5.86551 6.10516 6.20109 6.52342 6.77150 6.87583 6.97657 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.015 3.985 2 O -0.283 6.283 3 C 0.171 3.829 4 C 0.110 3.890 5 O -0.264 6.264 6 C 0.031 3.969 7 C 0.522 3.478 8 O -0.504 6.504 9 N -0.710 5.710 10 C 0.125 3.875 11 H 0.111 0.889 12 C -0.134 4.134 13 C -0.117 4.117 14 H 0.117 0.883 15 C 0.102 3.898 16 N -0.720 5.720 17 C 0.705 3.295 18 O -0.538 6.538 19 N -0.680 5.680 20 C 0.530 3.470 21 O -0.463 6.463 22 C -0.151 4.151 23 C -0.117 4.117 24 C -0.024 4.024 25 N 0.036 4.964 26 O -0.174 6.174 27 O -0.131 6.131 28 C 0.007 3.993 29 C -0.082 4.082 30 O -0.534 6.534 31 Si 0.688 3.312 32 C -0.186 4.186 33 H 0.061 0.939 34 H 0.063 0.937 35 H 0.117 0.883 36 H 0.101 0.899 37 H 0.102 0.898 38 H 0.405 0.595 39 H 0.101 0.899 40 H 0.086 0.914 41 H 0.135 0.865 42 H 0.442 0.558 43 H 0.435 0.565 44 H 0.077 0.923 45 H 0.100 0.900 46 H 0.168 0.832 47 H 0.102 0.898 48 H 0.390 0.610 49 H -0.247 1.247 50 H -0.250 1.250 51 H 0.157 0.843 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -2.175 2.463 -2.452 4.099 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 -0.080 4.080 2 O -0.194 6.194 3 C 0.122 3.878 4 C 0.062 3.938 5 O -0.176 6.176 6 C -0.048 4.048 7 C 0.306 3.694 8 O -0.377 6.377 9 N -0.364 5.364 10 C 0.020 3.980 11 H 0.129 0.871 12 C -0.172 4.172 13 C -0.136 4.136 14 H 0.135 0.865 15 C -0.007 4.007 16 N -0.386 5.386 17 C 0.404 3.596 18 O -0.411 6.411 19 N -0.351 5.351 20 C 0.315 3.685 21 O -0.331 6.331 22 C -0.190 4.190 23 C -0.136 4.136 24 C -0.108 4.108 25 N 0.555 4.445 26 O -0.384 6.384 27 O -0.352 6.352 28 C 0.005 3.995 29 C -0.193 4.193 30 O -0.341 6.341 31 Si 0.588 3.412 32 C -0.205 4.205 33 H 0.079 0.921 34 H 0.082 0.918 35 H 0.135 0.865 36 H 0.119 0.881 37 H 0.120 0.880 38 H 0.240 0.760 39 H 0.119 0.881 40 H 0.105 0.895 41 H 0.153 0.847 42 H 0.287 0.713 43 H 0.277 0.723 44 H 0.096 0.904 45 H 0.119 0.881 46 H 0.186 0.814 47 H 0.119 0.881 48 H 0.239 0.761 49 H -0.172 1.172 50 H -0.174 1.174 51 H 0.174 0.826 Dipole moment (debyes) X Y Z Total from point charges -3.055 -0.504 -1.978 3.674 hybrid contribution 1.065 0.720 0.166 1.296 sum -1.990 0.216 -1.812 2.700 Atomic orbital electron populations 1.23384 0.76950 1.05751 1.01865 1.86333 1.22323 1.24215 1.86566 1.18406 0.89114 0.85746 0.94502 1.17796 0.88242 0.85370 1.02365 1.86331 1.16792 1.26002 1.88502 1.22657 0.80298 0.97050 1.04776 1.19845 0.82473 0.90230 0.76819 1.90819 1.62515 1.37820 1.46501 1.45443 1.05752 1.09068 1.76174 1.21767 0.93892 0.85517 0.96823 0.87085 1.23369 0.94274 1.03983 0.95604 1.22989 0.91702 1.00857 0.98081 0.86497 1.21979 1.00272 0.81938 0.96542 1.45548 1.72300 1.09114 1.11663 1.15841 0.77754 0.84218 0.81820 1.91111 1.56915 1.17485 1.75571 1.44352 1.64438 1.10107 1.16200 1.20759 0.75752 0.83771 0.88239 1.90887 1.44234 1.22786 1.75209 1.23590 0.94695 1.02357 0.98334 1.20791 1.02198 0.88867 1.01782 1.20366 0.91809 0.83305 1.15346 1.43249 1.00942 1.02448 0.97823 1.94544 0.95687 1.93681 1.54509 1.94497 1.64689 1.24125 1.51911 1.18950 0.90714 0.95065 0.94781 1.24877 1.09147 0.93999 0.91269 1.86435 1.76672 1.44088 1.26916 0.94589 0.78997 0.87601 0.80022 1.20941 1.00755 0.90025 1.08776 0.92051 0.91796 0.86513 0.88103 0.88038 0.76004 0.88100 0.89514 0.84724 0.71272 0.72283 0.90444 0.88137 0.81420 0.88072 0.76134 1.17233 1.17392 0.82564 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 0.02 -0.03 9.81 101.05 0.99 0.97 16 2 O -0.28 -0.58 10.28 -34.22 -0.35 -0.93 16 3 C 0.17 0.31 6.70 -39.12 -0.26 0.05 16 4 C 0.11 0.17 6.70 -39.12 -0.26 -0.09 16 5 O -0.26 -0.55 9.45 -47.35 -0.45 -1.00 16 6 C 0.03 -0.06 5.22 36.01 0.19 0.13 16 7 C 0.52 -0.04 7.91 -10.98 -0.09 -0.13 16 8 O -0.50 -2.52 16.10 -14.35 -0.23 -2.75 16 9 N -0.71 2.53 5.26 -53.01 -0.28 2.25 16 10 C 0.13 -0.43 4.32 -67.11 -0.29 -0.72 16 11 H 0.11 -0.16 7.46 -51.93 -0.39 -0.54 16 12 C -0.13 0.83 7.32 -25.92 -0.19 0.64 16 13 C -0.12 0.63 3.52 -89.81 -0.32 0.31 16 14 H 0.12 -0.65 8.14 -51.93 -0.42 -1.07 16 15 C 0.10 -0.49 3.70 -68.20 -0.25 -0.74 16 16 N -0.72 2.90 4.45 -59.19 -0.26 2.63 16 17 C 0.70 -0.28 8.92 -88.02 -0.78 -1.07 16 18 O -0.54 -2.20 18.04 5.33 0.10 -2.10 16 19 N -0.68 1.17 5.70 -15.79 -0.09 1.08 16 20 C 0.53 -0.89 8.14 -10.56 -0.09 -0.98 16 21 O -0.46 -0.72 18.02 5.60 0.10 -0.62 16 22 C -0.15 0.52 7.26 -25.92 -0.19 0.33 16 23 C -0.12 -0.08 8.54 -39.46 -0.34 -0.41 16 24 C -0.02 -0.06 6.85 -79.95 -0.55 -0.61 16 25 N 0.04 0.15 4.45 33.96 0.15 0.30 16 26 O -0.17 -0.80 18.44 -29.46 -0.54 -1.34 16 27 O -0.13 -0.56 14.62 -35.96 -0.53 -1.09 16 28 C 0.01 0.01 5.29 -104.62 -0.55 -0.54 16 29 C -0.08 0.01 1.73 36.01 0.06 0.08 16 30 O -0.53 -0.08 11.77 -55.47 -0.65 -0.73 16 31 Si 0.69 -1.64 30.19 -169.99 -5.13 -6.77 16 32 C -0.19 -0.18 7.65 -39.46 -0.30 -0.49 16 33 H 0.06 -0.17 7.66 -51.93 -0.40 -0.57 16 34 H 0.06 -0.16 7.66 -51.93 -0.40 -0.56 16 35 H 0.12 -0.39 8.14 -51.93 -0.42 -0.81 16 36 H 0.10 -0.46 7.65 -51.93 -0.40 -0.85 16 37 H 0.10 -0.46 7.67 -51.93 -0.40 -0.86 16 38 H 0.40 -2.65 8.70 -40.82 -0.36 -3.01 16 39 H 0.10 -0.72 7.69 -51.93 -0.40 -1.12 16 40 H 0.09 -0.58 8.14 -51.93 -0.42 -1.01 16 41 H 0.14 -0.90 8.14 -51.93 -0.42 -1.32 16 42 H 0.44 -2.53 8.65 -40.82 -0.35 -2.88 16 43 H 0.43 -1.17 8.96 -40.82 -0.37 -1.54 16 44 H 0.08 -0.15 8.14 -51.93 -0.42 -0.57 16 45 H 0.10 -0.29 6.71 -51.93 -0.35 -0.64 16 46 H 0.17 -0.32 5.85 -52.49 -0.31 -0.62 16 47 H 0.10 -0.05 6.07 -51.93 -0.32 -0.36 16 48 H 0.39 -1.84 8.74 45.56 0.40 -1.44 16 49 H -0.25 0.16 6.75 56.52 0.38 0.54 16 50 H -0.25 0.07 7.11 56.52 0.40 0.47 16 51 H 0.16 -0.08 3.13 -52.49 -0.16 -0.24 16 LS Contribution 433.57 15.07 6.53 6.53 Total: 0.00 -16.46 433.57 -10.37 -26.84 By element: Atomic # 1 Polarization: -13.50 SS G_CDS: -5.52 Total: -19.02 kcal Atomic # 6 Polarization: -0.05 SS G_CDS: -3.22 Total: -3.27 kcal Atomic # 7 Polarization: 6.74 SS G_CDS: -0.48 Total: 6.26 kcal Atomic # 8 Polarization: -8.01 SS G_CDS: -2.56 Total: -10.57 kcal Atomic # 14 Polarization: -1.64 SS G_CDS: -5.13 Total: -6.77 kcal Total LS contribution 6.53 Total: 6.53 kcal Total: -16.46 -10.37 -26.84 kcal The number of atoms in the molecule is 51 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. s_22_17522896_4549636.mol2 51 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 -69.459 kcal (2) G-P(sol) polarization free energy of solvation -16.463 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -85.922 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.372 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -26.835 kcal (6) G-S(sol) free energy of system = (1) + (5) -96.294 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.52 seconds