Absorption of CO2 and CS2 into the Hofmann-type porous coordination polymer: Electrostatic versus dispersion interactions

Milind Madhusudan Deshmukh, Masaaki Ohba, Susumu Kitagawa, Shigeyoshi Sakaki

研究成果: Contribution to journalArticle査読

53 被引用数 (Scopus)

抄録

Absorption of CO2 and CS2 molecules into the Hofmann-type three-dimensional porous coordination polymer (PCP) {Fe(Pz)[Pt(CN)4]}n (Pz = pyrazine) was theoretically explored with the ONIOM(MP2.5 or SCS-MP2:DFT) method, where the M06-2X functional was employed in the DFT calculations. The binding energies of CS 2 and CO2 were evaluated to be -17.3 and -5.2 kcal mol-1, respectively, at the ONIOM(MP2.5:M06-2X) level and -16.9 and -4.4 kcal mol-1 at the ONIOM(SCS-MP2:M06-2X) level. It is concluded that CS2 is strongly absorbed in this PCP but CO2 is only weakly absorbed. The absorption positions of these two molecules are completely different: CO2 is located between two Pt atoms, whereas one S atom of CS2 is located between two Pz ligands and the other S atom is between two Pt atoms. The optimized position of CS2 agrees with the experimentally reported X-ray structure. To elucidate the reasons for these differences, we performed an energy decomposition analysis and found that (i) both the large binding energy and the absorption position of CS2 arise from a large dispersion interaction between CS2 and the PCP, (ii) the absorption position of CO2 is mainly determined by the electrostatic interaction between CO2 and the Pt moiety, and (iii) the small binding energy of CO2 comes from the weak dispersion interaction between CO2 and the PCP. Important molecular properties relating to the dispersion and electrostatic interactions, which are useful for understanding and predicting gas absorption into PCPs, are discussed in detail.

本文言語英語
ページ(範囲)4840-4849
ページ数10
ジャーナルJournal of the American Chemical Society
135
12
DOI
出版ステータス出版済み - 3 27 2013

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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