Selective separation of hexachloroplatinate(iv) dianions based on exo-binding with cucurbit[6]uril

Patent metadata

Field	Value
Publication number	US-2024262853-A1
Application number	US-202218563509-A
Country	US
Kind code	A1
Filing date	May 24, 2022
Priority date	May 24, 2021
Publication date	Aug 8, 2024
Grant date	—

Abstract

Disclosed herein are compounds, compositions, and methods for separating platinum halide dianions, such as [PtCl 6 ] 2− , with a cubcurbituril, such as cucurbit[6]uril, is disclosed herein.

First claim

1 . An adduct comprising a platinum halide dianion non-covalently bound to the outer surface of a cucurbituril.

2 . The adduct of claim 1 , wherein the platinum halide dianion is [PtX 6 ] 2− and X is a halogen.

3 . The adduct of claim 1 , wherein the platinum halide dianion is [PtCl 6 ] 2− .

4 . The adduct of claim 1 , wherein the cucurbituril is cucurbitu[6]ril.

5 . The adduct of claim 1 , wherein the adduct comprises the cucurbitu[6]ril and [PtCl 6 ] 2− , wherein the platinum halide dianion is non-covalently bound by a [Pt—Cl . . . H—C]hydrogen bond and/or a [Pt—Cl . . . C═O] ion-dipole interaction.

6 . A superstructure comprising the adduct of claim 1 .

7 . The superstructure of claim 6 , wherein the molar ratio of the platinum halide dianion and cucurbituril is 1:1.

8 . The superstructure of claim 7 , wherein the cucurbituril is surrounded by six adjacent platinum halide dianions.

9 . The superstructure of claim 7 , wherein every platinum halide dianion is surrounded by six cucurbituril molecules and stabilized by 14 sets of hydrogen bonds and two sets of ion-dipole interactions.

10 . A crystalline composition comprising the adduct of claim 1 .

11 . The crystalline composition of claim 10 , wherein the crystalline composition is in the monoclinic space group I2/a.

12 . The crystalline composition of claim 11 , wherein the crystalline composition has lattice parameters of a=13.3±0.2 Å, b=20.7±0.2 Å, c=24.2±0.2 Å, α=90.0±0.5°, β=94.4±0.5°, and γ=90.0±0.5°.

13 . A method for separation of a metal, the method comprising contacting a platinum halide dianion with a cucurbitrurial under conditions sufficient to cause co-precipitation of the platinum metal dianion and the cucurbitrurial.

14 . The method of claim 13 , wherein cucurbituril is cucurbitu[6]ril and the halide dianion is [PtX 6 ] 2− and X is a halogen, optionally wherein the platinum metal dianion is [PtCl 6 ] 2− .

15 . The method of claim 13 , further comprising contacting a platinum-bearing material with a hydrogen halide to form a metal-halide solution comprising the platinum halide dianion and wherein the platinum halide dianion in the metal-halide solution is contacted with the cucurbitrurial.

16 . The method of claim 13 , further comprising reducing platinum of the precipitate with a reductant.

17 . The method of claim 16 , further comprising isolating the reduced platinum.

18 . The method of claim 13 , further comprising isolating the cucurbitrurial of the precipitate.

19 . The method of claim 18 , wherein the isolated cucurbitrurial is recycled.

20 . The method of claim 13 , wherein the precipitate comprises an adduct comprising a platinum halide dianion non-covalently bound to the outer surface of a cucurbituril, a superstructure comprising the adduct, or a crystalline composition comprising the adduct.

Assignees

• Univ Northwestern

Inventors

• Stoddart James Fraser
• Wang Yu
• Wu Huang

Classifications

• C22B11/048

  from spent catalysts · CPC title

• C22B3/44

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title

• C22B3/205 Primary

  using adducts or inclusion complexes · CPC title

• C07D487/22

  in which the condensed system contains four or more hetero rings · CPC title

• C22B11/04

  by wet processes (extraction of metal compounds by leaching in organic solutions C22B3/16; treatment or purification of solutions by liquid-liquid extraction C22B3/26) · CPC title