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Volumn 128, Issue 19, 2006, Pages 6357-6368

Effect of hydration on coordination properties of uranyl(VI) complexes. A first-principles molecular dynamics study

Author keywords

[No Author keywords available]

Indexed keywords

COMPLEXATION; FREE ENERGY; HYDRATION; OPTIMIZATION; ORGANIC COMPOUNDS; SOLUTIONS; SOLVENT EXTRACTION;

EID: 33646570580     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja057301z     Document Type: Article
Times cited : (112)

References (83)
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    • 2) fragment in the Cambridge Structure Database affords 15 hits containing 3; for the most recent ones, see: (a) Charushnikova, I. A.; Den Auwer, C. Koord. Khim. 2004, 30, 546-554
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    • ref-code AZECUD
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    • note
    • The frozen core electrons are the Is shell for C, O, and N; 1s, 2s, 2p for C1; and 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 5s, 5p, 4f, 5d for U.
  • 41
    • 23844506811 scopus 로고    scopus 로고
    • Theoretical Chemistry, Vrije Universiteit: Amsterdam, The Netherlands, (see Supporting Information for full citation)
    • (c) Baerends, E. J. et al. ADF2004.01, SCM; Theoretical Chemistry, Vrije Universiteit: Amsterdam, The Netherlands, http://www.scm.com (see Supporting Information for full citation).
    • ADF2004.01, SCM
    • Baerends, E.J.1
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    • Copyright IBM Corp. 1990-2001, Copyright MPI für Festkörperforschung Stuttgart 1997-2001
    • CPMD, version 3.7.0; Copyright IBM Corp. 1990-2001, Copyright MPI für Festkörperforschung Stuttgart 1997-2001.
    • CPMD, Version 3.7.0
  • 50
    • 33646539997 scopus 로고    scopus 로고
    • note
    • Atomic orbitals were taken from the pseudo wave functions involved in construction of the pseudopotentials, except for hydrogen, where a standard Slater function was used.
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    • and references therein
    • Sprik, M.; Ciccotti, G. J. Chem. Phys. 1998, 109, 7737-7744 and references therein.
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    • Sprik, M.1    Ciccotti, G.2
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    • 0041430067 scopus 로고    scopus 로고
    • For earlier quantum-chemical studies of metal hydrates with second hydration shells, for instance, see: (a) Martinez, J. M.; Pappalardo, R. R.; Marcos, E, S. J. Phys. Chem. A 1997, 101, 444-4448.
    • (1997) J. Phys. Chem. A , vol.101 , pp. 444-4448
    • Martinez, J.M.1    Pappalardo, R.R.2    Marcos, E.S.3
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    • For many hydrates of the first transition row, present-day functionals (including BLYP) are indicated to underestimate the length (and, possibly, overestimate the strength) of H⋯O hydrogen bonds to water molecules from the second hydration sphere; see: Rotzinger, F. R. J. Phys. Chem. B 2005, 109, 1510-1527; this potential shortcoming could affect the lifetime of the water molecules in the second hydration sphere during the simulation.
    • (2005) J. Phys. Chem. B , vol.109 , pp. 1510-1527
    • Rotzinger, F.R.1
  • 70
    • 33646572116 scopus 로고    scopus 로고
    • note
    • These simulations were started from constrained CPMD runs performed at the beginning and at the end of the forward and reverse paths, respectively, connecting 1 to a transient hexahydrate (cf. ref 11b), lifting the constraint (which involved the difference between two U-O distances and which had given rise to very small mean constraint forces at both points), and running for a total of 3 and 3.3 ps. The resulting trajectories can be considered as uncorrelated to that from ref 11a. For the RDFs shown in Figures 2 and 3, the last 3.5 ps from the latter trajectory and the last 2.5 ps from each of the new ones were employed.
  • 76
    • 33646576425 scopus 로고    scopus 로고
    • note
    • In their recent classical MD simulations based on a CASPT2-derived force field, Roos et al. do not observe hydrogen bonding between water and the uranyl oxygens, cf. ref 32g.
  • 78
    • 33646576753 scopus 로고    scopus 로고
    • note
    • 2 moieties are found in the CPMD simulations in water (cf. snapshots on the bottom of Figure 7).
  • 79
    • 33646540320 scopus 로고    scopus 로고
    • note
    • 2O → 3c are -15.6 and -10.3 kcal/mol at the BSSE-corrected HF/LANL (ref 6b) and BLYP/ZORA levels, respectively.
  • 80
    • 0003838469 scopus 로고    scopus 로고
    • Wiley-VCH: Weinheim
    • This differential solvation effect for complexes involving neutral or anionic ligands arguably arises from a balance between cation-anion, ion-dipole, and dipole-dipole interactions in the dynamic ensemble. Even though the underlying electrostatics are usually modeled quite well with present-day density functionals (which also tend to afford reasonably accurate dipole moments and polarizabilities, cf. Koch, W.; Holthausen, M. C. A Chemist's Guide to Density Functional Theory; Wiley-VCH: Weinheim, 2000), such a delicate balance may be difficult to describe, and quantitative inaccuracies might add up to a qualitative change of the overall picture.
    • (2000) A Chemist's Guide to Density Functional Theory
    • Koch, W.1    Holthausen, M.C.2
  • 81
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    • In context with the types of interactions studied here, however, we note that the solvent-induced bond contraction in metal-aquo complexes (cf. ref 33) is also found with DFT methods (e.g., ref 38b); likewise, the elongation of cation-anion distances in simple contact ion pairs such as alkali-metal or silver halides upon hydration (i.e., the onset of dissociation in water) is also well described with DFT (e.g., Godinho, S. S. M. C.; Cabral do Couto, P.; Costa Cabral, B. J. J. Chem. Phys. 2005, 122, 044316). Thus, we are confident that our results are qualitatively correct and are not artifacts of the adopted DFT approach.
    • (2005) J. Chem. Phys. , vol.122 , pp. 044316
    • Godinho, S.S.M.C.1    Cabral Do Couto, P.2    Costa Cabral, B.J.3
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    • note
    • Effected via restart of the equilibrated 300 K simulation and instantaneous heatup.
  • 83
    • 33646571425 scopus 로고    scopus 로고
    • note
    • In the COSMO model, it is the screening term that dominates the changes with respect to the gas phase; the dispersion/cavitation term contributes less than 1.5 kcal/mol to the energy differences discussed.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.