{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T01:52:32Z","timestamp":1783475552798,"version":"3.55.0"},"reference-count":80,"publisher":"AIP Publishing","issue":"7","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2008,8,21]]},"abstract":"<jats:p>Colloidal quantum dots are semiconductor nanocrystals (NCs) which have stimulated a great deal of research and have attracted technical interest in recent years due to their chemical stability and the tunability of photophysical properties. While internal structure of large quantum dots is similar to bulk, their surface structure and passivating role of capping ligands (surfactants) are not fully understood to date. We apply ab initio wavefunction methods, density functional theory, and semiempirical approaches to study the passivation effects of substituted phosphine and amine ligands on the minimal cluster Cd2Se2, which is also used to benchmark different computational methods versus high level ab initio techniques. Full geometry optimization of Cd2Se2 at different theory levels and ligand coverage is used to understand the affinities of various ligands and the impact of ligands on cluster structure. Most possible bonding patterns between ligands and surface Cd\u2215Se atoms are considered, including a ligand coordinated to Se atoms. The degree of passivation of Cd and Se atoms (one or two ligands attached to one atom) is also studied. The results suggest that B3LYP\/LANL2DZ level of theory is appropriate for the system modeling, whereas frequently used semiempirical methods (such as AM1 and PM3) produce unphysical results. The use of hydrogen atom for modeling of the cluster passivating ligands is found to yield unphysical results as well. Hence, the surface termination of II\u2013VI semiconductor NCs with hydrogen atoms often used in computational models should probably be avoided. Basis set superposition error, zero-point energy, and thermal corrections, as well as solvent effects simulated with polarized continuum model are found to produce minor variations on the ligand binding energies. The effects of Cd\u2013Se complex structure on both the electronic band gap (highest occupied molecular orbital\u2013lowest unoccupied molecular orbital energy difference) and ligand binding energies are systematically examined. The role played by positive charges on ligand binding is also explored. The calculated binding energies for various ligands L are found to decrease in the order OPMe3&amp;gt;OPH3&amp;gt;NH2Me\u2a7eNH3\u2a7eNMe3&amp;gt;PMe3&amp;gt;PH3 for neutral clusters and OPMe3&amp;gt;OPH3&amp;gt;PMe3\u2a7eNMe3\u2a7eNH2Me\u2a7eNH3&amp;gt;PH3 and OPMe3&amp;gt;OPH3&amp;gt;NH2Me\u2a7eNMe3\u2a7ePMe3\u2a7eNH3&amp;gt;PH3 for single and double ligations of positively charged Cd2Se22+ cluster, respectively.<\/jats:p>","DOI":"10.1063\/1.2965532","type":"journal-article","created":{"date-parts":[[2008,8,21]],"date-time":"2008-08-21T22:31:37Z","timestamp":1219357897000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":59,"title":["Quantum chemistry of the minimal CdSe clusters"],"prefix":"10.1063","volume":"129","author":[{"given":"Ping","family":"Yang","sequence":"first","affiliation":[{"name":"Los Alamos National Laboratory 1 Theoretical Division, , Los Alamos, New Mexico 87545, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergei","family":"Tretiak","sequence":"additional","affiliation":[{"name":"Los Alamos National Laboratory 1 Theoretical Division, , Los Alamos, New Mexico 87545, USA"},{"name":"Los Alamos National Laboratory 2 Center for Nonlinear Studies (CNLS), , Los Alamos, New Mexico 87545, USA"},{"name":"Los Alamos National Laboratory 3 Center for Integrated Nanotechnologies (CINT), , Los Alamos, New Mexico 87545, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Art\u00ebm E.","family":"Masunov","sequence":"additional","affiliation":[{"name":"University of Central Florida 4 Nanoscience Technology Center (NSTC), , Florida 32826, USA ; Department of Chemistry, , Florida 32826, USA ; Department of Physics, , Florida 32826, USA"},{"name":"University of Central Florida 4 Nanoscience Technology Center (NSTC), , Florida 32826, USA ; Department of Chemistry, , Florida 32826, USA ; Department of Physics, , Florida 32826, USA"},{"name":"University of Central Florida 4 Nanoscience Technology Center (NSTC), , Florida 32826, USA ; Department of Chemistry, , Florida 32826, USA ; Department of Physics, , Florida 32826, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergei","family":"Ivanov","sequence":"additional","affiliation":[{"name":"Los Alamos National Laboratory 3 Center for Integrated Nanotechnologies (CINT), , Los Alamos, New Mexico 87545, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2008,8,21]]},"reference":[{"key":"2023080400053877200_c1a","doi-asserted-by":"publisher","first-page":"R15","DOI":"10.1088\/0957-4484\/14\/7\/201","volume":"14","year":"2003","journal-title":"Nanotechnology"},{"key":"2023080400053877200_c1b","doi-asserted-by":"publisher","first-page":"261","DOI":"10.1002\/1438-5171(200112)2:4&lt;261::AID-SIMO261&gt;3.0.CO;2-P","volume":"2","year":"2001","journal-title":"Single Mol."},{"key":"2023080400053877200_c2","doi-asserted-by":"publisher","first-page":"8706","DOI":"10.1021\/ja00072a025","volume":"115","year":"1993","journal-title":"J. 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