Luận án Computational studies of s-containing drugs binding to gold clusters for applications in drug delivery

This thesis provides a concise analysis of the structural evolution, stability trends, and energetic characteristics of small gold clusters ranging from two to twenty atoms. Next we present a thorough investigation on the adsorption and desorption behaviors of certain anti-cancer drugs on a gold nanostructured surface, as well as the chemical enhancement of surface-enhanced Raman spectroscopy (SERS). Small Aun clusters are utilized as reactant models to simulate the surface of gold nanoparticles. The impact of an aqueous solution on the structural, energetic, and spectroscopic characteristics of the resulting complexes is evaluated using the IEF-PCM model. The 6MP molecule prefers to bind with Au metals via the S-atom of the thione group and is further stabilized by the N−H∙∙∙Au contact. However, in an acidic solution when the drug mainly exists in the thiol form, the interaction was mostly dominated by the weak AuH−S interaction, rather than the stronger covalent Au−S bond. Binding energies are substantially reduced from −29 kcal/mol in a vacuum to −22 and −11 kcal/mol in neutral and acidic solutions, respectively. Investigation into the frontier MOs also revealed that the forward donation from HOMO(6MP) to LUMO(Au20) is a main ingredient for the 6MP−Au chemical bonding. A comparison of current computed results with previously measured SERS spectra allowed the preferable orientation of drug molecules on the gold surface to be verified. In a neutral solution, both N−H bending and stretching modes are the predominant factors leading to the SERS enhancement as they are directly oriented to the gold surface. In an acidic environment, the most enhanced peak is found in the fingerprint region and mainly arises from the AuH−S bond rather than the aromatic ring-gold surface π overlap as previously assumed.

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-1.568537000 2.644103000 0.000000000 PL23 Au -2.176118000 0.409235000 -1.358752000 Au -2.176118000 -1.436512000 3.200159000 Au -2.176118000 0.409235000 1.358752000 Au 0.281716000 0.691310000 0.000000000 Au12-IV Au -1.165290000 0.887018000 0.000000000 Au -0.739984000 2.154195000 2.349766000 Au 0.162654000 3.249631000 0.000000000 Au -0.739984000 2.154195000 -2.349766000 Au -1.557976000 -1.767801000 0.000000000 Au -0.416343000 -0.645016000 2.223652000 Au 0.218076000 -3.208444000 1.437696000 Au 0.218076000 -3.208444000 -1.437696000 Au -0.416343000 -0.645016000 -2.223652000 Au 1.538670000 1.121209000 1.341915000 Au 1.538670000 1.121209000 -1.341915000 Au 1.359775000 -1.212736000 0.000000000 Au13-I Au 0.000000000 2.658102000 2.766889000 Au 0.000000000 -1.333909000 -3.444360000 Au -1.426797000 1.362083000 0.880676000 Au 1.426797000 1.362083000 0.880676000 Au -1.385186000 0.000000000 -1.434062000 Au 1.385186000 0.000000000 -1.434062000 Au 0.000000000 0.000000000 2.889397000 Au 0.000000000 -2.566295000 -1.094517000 Au -1.426797000 -1.362083000 0.880676000 Au 1.426797000 -1.362083000 0.880676000 Au 0.000000000 -2.658102000 2.766889000 Au 0.000000000 1.333909000 -3.444360000 Au 0.000000000 2.566295000 -1.094517000 PL24 Au13-II Au -3.012570000 -2.451902000 0.000000000 Au 3.166718000 1.508252000 0.000000000 Au -0.890892000 -1.508365000 1.379901000 Au -0.890892000 -1.508365000 -1.379901000 Au 1.424583000 -0.095248000 1.395620000 Au 1.424583000 -0.095248000 -1.395620000 Au -2.812727000 0.195663000 0.000000000 Au 0.715776000 2.528018000 0.000000000 Au -0.890892000 1.164595000 1.718358000 Au -0.890892000 1.164595000 -1.718358000 Au -2.128623000 2.836817000 0.000000000 Au 3.547958000 -1.177988000 0.000000000 Au 1.237871000 -2.560823000 0.000000000 Au13-III Au 0.000000000 3.603825000 1.529927000 Au 0.000000000 -3.603825000 1.529927000 Au 1.428474000 1.338445000 1.153260000 Au -1.428474000 1.338445000 1.153260000 Au 1.428474000 -1.338445000 1.153260000 Au -1.428474000 -1.338445000 1.153260000 Au 0.000000000 2.540508000 -0.903051000 Au 0.000000000 -2.540508000 -0.903051000 Au 1.377086000 0.000000000 -1.231731000 Au -1.377086000 0.000000000 -1.231731000 Au 0.000000000 -1.370514000 -3.239596000 Au 0.000000000 1.370514000 -3.239596000 Au 0.000000000 0.000000000 3.075865000 PL25 Au13-IV Au 0.000000000 1.680227000 0.253849000 Au 1.838299000 2.032353000 2.195758000 Au 0.621616000 2.137300000 -2.400241000 Au 2.224672000 -0.309977000 0.875718000 Au 2.581236000 2.032075000 -0.505710000 Au 0.000000000 0.000000000 2.531906000 Au 0.000000000 -1.680227000 0.253849000 Au -1.371930000 0.345321000 -1.685327000 Au 1.371930000 -0.345321000 -1.685327000 Au -2.581236000 -2.032075000 -0.505710000 Au -2.224672000 0.309977000 0.875718000 Au -0.621616000 -2.137300000 -2.400241000 Au -1.838299000 -2.032353000 2.195758000 Au13-V Au 0.000000000 3.610998000 -2.127437000 Au 0.000000000 -3.610998000 -2.127437000 Au -1.401295000 1.307906000 -1.858095000 Au 1.401295000 1.307906000 -1.858095000 Au -1.401295000 -1.307906000 -1.858095000 Au 1.401295000 -1.307906000 -1.858095000 Au 0.000000000 2.508313000 0.274364000 Au 0.000000000 -2.508313000 0.274364000 Au -1.372177000 0.000000000 0.521374000 Au 1.372177000 0.000000000 0.521374000 Au 0.000000000 0.000000000 4.870582000 Au 0.000000000 -1.350112000 2.612598000 Au 0.000000000 1.350112000 2.612598000 PL26 Au13-VI Au 0.000011000 0.167942000 -0.928708000 Au 2.762354000 0.044926000 -0.759806000 Au 1.363684000 -1.944255000 -2.020261000 Au 3.825914000 2.392110000 -0.298319000 Au 1.338462000 2.158402000 0.468217000 Au -2.762330000 0.044943000 -0.759837000 Au -1.338444000 2.158432000 0.468178000 Au -1.363647000 -1.944259000 -2.020252000 Au -3.825898000 2.392124000 -0.298355000 Au 1.406221000 -1.784135000 0.669840000 Au -0.000035000 0.300534000 1.900899000 Au -1.406272000 -1.784139000 0.669846000 Au -0.000019000 -2.202625000 2.908557000 Au13-VII Au 4.402811000 -0.010296000 0.000000000 Au -3.346755000 -1.941657000 0.000000000 Au 2.612532000 1.929093000 0.000000000 Au -2.666714000 0.634770000 0.000000000 Au -1.782427000 3.250108000 0.000000000 Au 0.769670000 3.862078000 0.000000000 Au 1.817176000 -0.674805000 0.000000000 Au 0.000000000 1.265623000 0.000000000 Au -0.763944000 -1.272284000 0.000000000 Au -1.486564000 -3.849812000 0.000000000 Au 1.091543000 -3.280042000 0.000000000 Au 3.668480000 -2.593268000 0.000000000 Au -4.315808000 2.680494000 0.000000000 PL27 Au13-VIII Au 0.000000000 3.993803000 -1.226693000 Au 0.000000000 -3.993803000 -1.226693000 Au 0.000000000 2.704097000 1.103664000 Au 0.000000000 -2.704097000 1.103664000 Au 0.000000000 -1.383177000 3.368096000 Au 0.000000000 1.383177000 3.368096000 Au 0.000000000 0.000000000 5.596918000 Au 0.000000000 1.324478000 -1.228925000 Au 0.000000000 0.000000000 1.070933000 Au 0.000000000 -1.324478000 -1.228925000 Au 0.000000000 -2.642487000 -3.546865000 Au 0.000000000 0.000000000 -3.606407000 Au 0.000000000 2.642487000 -3.546865000 Au14 Au 0.000000000000 3.710105000000 -0.169864000000 Au 0.000000000000 -3.710105000000 -0.169864000000 Au -1.401770000000 1.372029000000 -0.650948000000 Au 1.401770000000 1.372029000000 -0.650948000000 Au -1.401770000000 -1.372029000000 -0.650948000000 Au 1.401770000000 -1.372029000000 -0.650948000000 Au 0.000000000000 2.169613000000 2.000672000000 Au 0.000000000000 -2.169613000000 2.000672000000 Au -1.614897000000 0.000000000000 1.626738000000 Au 1.614897000000 0.000000000000 1.626738000000 Au 0.000000000000 0.000000000000 3.815226000000 Au 0.000000000000 2.680212000000 -2.707816000000 Au 0.000000000000 -2.680212000000 -2.707816000000 Au 0.000000000000 0.000000000000 -2.710896000000 PL28 Au15 Au -0.929778000000 -1.518994000000 1.354937000000 Au -0.111259000000 0.846940000000 2.784234000000 Au -2.698646000000 0.612878000000 1.321133000000 Au -0.929778000000 -1.518994000000 -1.354937000000 Au -2.698646000000 0.612878000000 -1.321133000000 Au 1.611838000000 2.491121000000 1.373488000000 Au -0.302461000000 1.015963000000 0.000000000000 Au -0.111259000000 0.846940000000 -2.784234000000 Au 1.611838000000 2.491121000000 -1.373488000000 Au 1.955055000000 -0.201711000000 1.398706000000 Au 1.955055000000 -0.201711000000 -1.398706000000 Au 1.175478000000 -2.490485000000 0.000000000000 Au -2.147118000000 -0.668938000000 -3.645211000000 Au 3.766798000000 -1.648070000000 0.000000000000 Au -2.147118000000 -0.668938000000 3.645211000000 Au16 Au 1.934783000000 -0.050757000000 -1.934783000000 Au -0.050757000000 1.934783000000 -1.934783000000 Au 1.934783000000 1.934783000000 0.050757000000 Au 1.934783000000 -1.934783000000 -0.050757000000 Au 1.934783000000 0.050757000000 1.934783000000 Au -1.934783000000 1.934783000000 -0.050757000000 Au 0.050757000000 1.934783000000 1.934783000000 Au -0.050757000000 -1.934783000000 1.934783000000 Au -1.934783000000 -0.050757000000 1.934783000000 Au -1.934783000000 0.050757000000 -1.934783000000 Au -1.934783000000 -1.934783000000 0.050757000000 PL29 Au 0.050757000000 -1.934783000000 -1.934783000000 Au -2.519969000000 2.519969000000 2.519969000000 Au 2.519969000000 -2.519969000000 2.519969000000 Au -2.519969000000 -2.519969000000 -2.519969000000 Au 2.519969000000 2.519969000000 -2.519969000000 Au17-I Au 0.000000000 2.945366000 0.005946000 Au -2.190363000 -1.416743000 -0.727884000 Au 3.613550000 0.000000000 1.193858000 Au 1.362349000 1.447830000 1.911960000 Au 2.190363000 1.416743000 -0.727884000 Au -1.362349000 -1.447830000 1.911960000 Au -1.362349000 1.447830000 1.911960000 Au -3.613550000 0.000000000 1.193858000 Au 0.000000000 1.484610000 -2.369677000 Au -2.190363000 1.416743000 -0.727884000 Au 0.000000000 0.000000000 3.842980000 Au 0.000000000 -1.484610000 -2.369677000 Au 0.000000000 -2.945366000 0.005946000 Au 2.190363000 -1.416743000 -0.727884000 Au -2.208149000 0.000000000 -3.119768000 Au 2.208149000 0.000000000 -3.119768000 Au 1.362349000 -1.447830000 1.911960000 Au17-II Au 1.377657000 1.922706000 1.425639000 Au 0.000040000 -2.417089000 -2.261997000 Au -2.042883000 -0.772138000 -1.418461000 Au -1.377702000 1.922665000 -1.425621000 Au 2.042896000 -0.772073000 -1.418480000 PL30 Au 1.377657000 1.922706000 -1.425639000 Au -0.000038000 3.862791000 0.000000000 Au -1.453776000 -3.068487000 0.000000000 Au 2.042896000 -0.772073000 1.418480000 Au 3.573572000 1.044743000 0.000000000 Au -1.377702000 1.922665000 1.425621000 Au -0.000013000 0.208301000 3.098493000 Au -3.573612000 1.044639000 0.000000000 Au -0.000013000 0.208301000 -3.098493000 Au 1.453862000 -3.068425000 0.000000000 Au 0.000040000 -2.417089000 2.261997000 Au -2.042883000 -0.772138000 1.418461000 Au18-I Au 0.011715000 0.257422000 3.044780000 Au 1.707340000 -1.603682000 -1.867955000 Au -2.823823000 2.443032000 0.000000000 Au -0.486764000 2.326446000 1.396872000 Au -2.316379000 0.230243000 1.510023000 Au 2.035892000 1.118465000 -1.428352000 Au 2.035892000 1.118465000 1.428352000 Au 3.457144000 -0.731667000 0.000000000 Au -0.970533000 -2.118896000 2.202848000 Au 1.707340000 -1.603682000 1.867955000 Au 1.596445000 3.401685000 0.000000000 Au -0.970533000 -2.118896000 -2.202848000 Au 0.011715000 0.257422000 -3.044780000 Au -2.316379000 0.230243000 -1.510023000 Au 0.330489000 -3.123258000 0.000000000 Au -2.510083000 -2.055612000 0.000000000 Au -0.486764000 2.326446000 -1.396872000 Au -0.012711000 -0.354176000 0.000000000 PL31 Au18-II Au -1.972593000 1.384024000 0.289269000 Au 1.393290000 -2.380523000 -2.205929000 Au 1.972593000 -1.384024000 0.289269000 Au 0.000000000 -1.731438000 2.197396000 Au -1.393290000 -2.380523000 -2.205929000 Au -1.972593000 -1.384024000 0.289269000 Au -2.157789000 0.000000000 2.615069000 Au 2.731666000 0.000000000 -1.981623000 Au -1.393290000 2.380523000 -2.205929000 Au -2.731666000 0.000000000 -1.981623000 Au 0.000000000 1.731438000 2.197396000 Au 0.000000000 3.275468000 0.003706000 Au 2.157789000 0.000000000 2.615069000 Au 0.000000000 -3.275468000 0.003706000 Au 0.000000000 0.000000000 -2.329379000 Au 1.393290000 2.380523000 -2.205929000 Au 1.972593000 1.384024000 0.289269000 Au 0.000000000 0.000000000 4.326925000 Au19 Au -2.821782000 1.629156000 -0.915777000 Au -1.345661000 2.489567000 1.491942000 Au 1.345661000 2.489567000 1.491942000 Au 2.821782000 1.629156000 -0.915777000 Au 1.420483000 0.820116000 -3.116596000 Au -1.420483000 0.820116000 -3.116596000 Au 0.000000000 1.838831000 -0.905302000 Au -2.828859000 -0.079407000 1.491942000 Au -1.592474000 -0.919416000 -0.905302000 Au 0.000000000 -1.640232000 -3.116596000 PL32 Au 0.000000000 0.000000000 1.604335000 Au 2.828859000 -0.079407000 1.491942000 Au 1.592474000 -0.919416000 -0.905302000 Au 0.000000000 -3.258313000 -0.915777000 Au -1.483198000 -2.410160000 1.491942000 Au 1.483198000 -2.410160000 1.491942000 Au -4.064304000 2.346527000 1.419012000 Au 4.064304000 2.346527000 1.419012000 Au 0.000000000 -4.693054000 1.419012000 Au20 Au 0.951901000 0.951901000 3.045679000 Au 0.951901000 3.045679000 0.951901000 Au -0.951901000 3.045679000 -0.951901000 Au -3.045679000 0.951901000 -0.951901000 Au -3.045679000 -0.951901000 0.951901000 Au -0.951901000 -0.951901000 3.045679000 Au -1.101169000 1.101169000 1.101169000 Au 3.045679000 0.951901000 0.951901000 Au 1.101169000 -1.101169000 1.101169000 Au -0.951901000 -3.045679000 0.951901000 Au 1.101169000 1.101169000 -1.101169000 Au -0.951901000 0.951901000 -3.045679000 Au -1.101169000 -1.101169000 -1.101169000 Au 0.951901000 -3.045679000 -0.951901000 Au 3.045679000 -0.951901000 -0.951901000 Au 0.951901000 -0.951901000 -3.045679000 Au 2.877539000 2.877539000 2.877539000 Au -2.877539000 2.877539000 -2.877539000 Au -2.877539000 -2.877539000 2.877539000 Au 2.877539000 -2.877539000 -2.877539000

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