Positive halogen cryptate: complexation of iodine with [2.2.2]cryptand

Pierre, J.-L.; Handel, Henri; Labbé, Pierre; Goaller, R. Le

doi:10.1021/ja00541a041

Cited by 18 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The primary driving forces for this reaction are the strong bonds formed between Cd 2+ and the terminal iodides of n -I 5 - , coupled with the need for the 3-coordinate Cd 2+ ions to increase their coordination numbers. Also important is the ability of the anionic zeolite to provide a hospitable environment for the cyclo -I 4 2+ cations, as it had for the polyatomic sulfur cations 26 and as cryptate molecules had for Na + and I + cations. − …”

Section: Discussionmentioning

confidence: 99%

“…Also important is the ability of the anionic zeolite to provide a hospitable environment for the cyclo-I 4 2+ cations, as it had for the polyatomic sulfur cations 26 and as cryptate molecules had for Na + and I + cations. [11][12][13][14][15][16]…”

Section: Discussionmentioning

confidence: 99%

“… In this case, Na + is captured by a cryptate molecule, leaving Na - as the product anion. The same disproportionation reaction occurs with iodine. − Macrocycles can do this also, forming a sandwich around the cation Sometimes two different macrocycles work best.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd²⁺-Exchanged Zeolite X Containing n-I₅^- as I^-−I₃⁺−I^- and Square cyclo-I₄²⁺

et al. 2003

View full text Add to dashboard Cite

The crystal structure of an iodine sorption complex of fully dehydrated, fully Cd2+-exchanged zeolite X, Cd46Si100Al92O384 · 89.6I per unit cell (a = 24.861(8) Å), has been determined by single-crystal X-ray diffraction methods in the cubic space group Fd3̄m at 21(1) °C. The crystal was prepared by ion exchange in a slightly basic aqueous stream 0.05 M in Cd2+, followed by washing with distilled water at 80 °C. Dehydration was then done at 450 °C and 2 × 10-6 Torr, followed by exposure in situ to zeolitically dry iodine vapor. The structure was refined to the final error indices R 1 = 0.044 and R 2 = 0.043 with 263 reflections, for which I > 3σ(I). Forty-six Cd2+ ions are found at four crystallographic sites: 14 at site I at the center of the hexagonal prism (Cd−O = 2.389(5) Å), 4 at site I‘ in the sodalite cavity just outside the hexagonal prism (Cd−O = 2.441(8) Å), 2.4 at site II‘ in the sodalite cavity (Cd−O = 2.200(9) Å), and the remaining 25.6 at site II near single six-oxygen rings in the supercage (Cd−O = 2.218(7) Å). All 44.8 diiodine molecules sorbed per unit cell have disproportionated to give 12.8 n-I5 - anions with symmetry 2 and 6.4 square cyclo-I4 2+ cations. The sorption reaction ends precisely when the eight supercages per unit cell are full (12.8/2 + 6.4/4 = 8.0). In cyclo-I4 2+, I−I = 2.757(14) Å and 2.796(13) Å, and I−I−I = 90.0(5)°; each iodine atom is 3.167(10) Å from a framework oxygen (I−I···O = 159.4(4)°). In n-I5 -, the central bond lengths are 2.473(14) Å and the terminal bond lengths are 2.534(13) Å, all less than 2.67 Å, the I−I distance in I2. The central bond angle, 114.8(7)°, is indicative of I3 +, indicating that the terminal atoms are iodide ions. That the terminal atoms coordinate to Cd2+ also indicates that they are iodide ions. The 12.8 n-I5 - anions per unit cell each bridge between two site-II Cd2+ ions in the supercage.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd²⁺-Exchanged Zeolite X Containing n-I₅^- as I^-−I₃⁺−I^- and Square cyclo-I₄²⁺

et al. 2003

View full text Add to dashboard Cite

show abstract

Nickel‐Catalyzed Carbonylations

Das

Bhanage

2021

Carbon Monoxide in Organic Synthesis

View full text Add to dashboard Cite

ChemInform Abstract: POSITIVE HALOGEN CRYPTATE: COMPLEXATION OF IODINE WITH (2.2.2)CRYPTAND

Pierre¹,

Handel²,

Labbé³

et al. 1981

Chemischer Informationsdienst

View full text Add to dashboard Cite

Positive halogen cryptate: complexation of iodine with [2.2.2]cryptand

Cited by 18 publications

References 2 publications

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd²⁺-Exchanged Zeolite X Containing n-I₅^- as I^-−I₃⁺−I^- and Square cyclo-I₄²⁺

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd²⁺-Exchanged Zeolite X Containing n-I₅^- as I^-−I₃⁺−I^- and Square cyclo-I₄²⁺

Nickel‐Catalyzed Carbonylations

ChemInform Abstract: POSITIVE HALOGEN CRYPTATE: COMPLEXATION OF IODINE WITH (2.2.2)CRYPTAND

Contact Info

Product

Resources

About

Positive halogen cryptate: complexation of iodine with [2.2.2]cryptand

Cited by 18 publications

References 2 publications

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd2+-Exchanged Zeolite X Containing n-I5- as I-−I3+−I- and Square cyclo-I42+

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd2+-Exchanged Zeolite X Containing n-I5- as I-−I3+−I- and Square cyclo-I42+

Nickel‐Catalyzed Carbonylations

ChemInform Abstract: POSITIVE HALOGEN CRYPTATE: COMPLEXATION OF IODINE WITH (2.2.2)CRYPTAND

Contact Info

Product

Resources

About

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd²⁺-Exchanged Zeolite X Containing n-I₅^- as I^-−I₃⁺−I^- and Square cyclo-I₄²⁺

Disproportionation of an Element in a Zeolite. II. Crystal Structure of an Iodine Sorption Complex of Dehydrated Fully Cd²⁺-Exchanged Zeolite X Containing n-I₅^- as I^-−I₃⁺−I^- and Square cyclo-I₄²⁺