Aluminum trihalide-neutral ligand ionic liquids and their use in aluminum deposition

Patent metadata

Field	Value
Publication number	US-2016108533-A1
Application number	US-201414516611-A
Country	US
Kind code	A1
Filing date	Oct 17, 2014
Priority date	Oct 17, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

An ionic liquid composition comprising a complex of a trihalo aluminum (III) species with at least one organic uncharged ligand comprising a ring structure having at least three ring carbon atoms and at least one ring heteroatom selected from nitrogen and sulfur, wherein the complex is a liquid at a temperature of 100° C. or less. Methods of electroplating aluminum onto a metallic substrate using the above-described ionic liquid composition are also described.

First claim

What is claimed is:

1 . An ionic liquid composition comprising a complex of a trihalo aluminum (III) species with at least one organic uncharged ligand comprising a ring structure having at least three ring carbon atoms and at least one ring heteroatom selected from nitrogen and sulfur, wherein said complex is a liquid at a temperature of 100° C. or less.

2 . The ionic liquid composition of claim 1 , wherein said complex is a liquid at a temperature of 50° C. or less.

3 . The ionic liquid composition of claim 1 , wherein said complex is a liquid at a temperature of 30° C. or less.

4 . The ionic liquid composition of claim 1 , wherein the ionic liquid composition contains said complex in liquid form in the substantial absence of an organic or inorganic solvent.

5 . The ionic liquid composition of claim 1 , wherein said organic uncharged ligand comprises a nitrogen-containing heterocyclic structure having at least three ring carbon atoms and at least one ring nitrogen atom.

6 . The ionic liquid composition of claim 5 , wherein said nitrogen-containing heterocyclic structure further comprises at least one alkyl or alkenyl substituent bound to a ring carbon atom.

7 . The ionic liquid composition of claim 6 , wherein the alkyl or alkenyl substituent contains at least three carbon atoms.

8 . The ionic liquid composition of claim 5 , wherein said nitrogen-containing heterocyclic structure is unsaturated.

9 . The ionic liquid composition of claim 8 , wherein said nitrogen-containing heterocyclic structure comprises a pyridine ring.

10 . The ionic liquid composition of claim 9 , wherein said pyridine ring is an alkyl- or alkenyl-substituted pyridine ring.

11 . The ionic liquid composition of claim 10 , wherein the alkyl or alkenyl substituent contains at least three carbon atoms.

12 . A method of electroplating aluminum onto a metallic substrate, the method comprising:
(i) contacting said metallic substrate, in the substantial absence of water, with an ionic liquid composition comprising a complex of a trihalo aluminum (III) species with at least one organic uncharged ligand comprising a ring structure having at least three ring carbon atoms and at least one ring heteroatom selected from nitrogen and sulfur, wherein said ionic liquid composition is in contact with an anode, and (ii) applying a voltage potential between the anode and said metallic substrate as cathode to produce a coating of aluminum on said metallic substrate while the metallic substrate is in contact with the ionic liquid composition.

13 . The method of claim 12 , wherein said metallic substrate is comprised of at least one metal selected from titanium, tantalum, iron, cobalt, nickel, copper, and zinc.

14 . The method of claim 12 , wherein said organic uncharged ligand comprises a nitrogen-containing heterocyclic structure having at least three ring carbon atoms and at least one ring nitrogen atom.

15 . The method of claim 14 , wherein said nitrogen-containing heterocyclic structure further comprises at least one alkyl or alkenyl substituent bound to a ring carbon atom.

16 . The method of claim 15 , wherein the alkyl or alkenyl substituent contains at least three carbon atoms.

17 . The method of claim 14 , wherein said nitrogen-containing heterocyclic structure is unsaturated.

18 . The method of claim 17 , wherein said nitrogen-containing heterocyclic structure comprises a pyridine ring.

19 . The method of claim 18 , wherein said pyridine ring is an alkyl- or alkenyl-substituted pyridine ring.

20 . The method of claim 19 , wherein the alkyl or alkenyl substituent contains at least three carbon atoms.

21 . The method of claim 12 , wherein the ionic liquid composition contains said complex in liquid form in the substantial absence of an organic or inorganic solvent.

22 . The method of claim 21 , wherein step (ii) is conducted at a temperature of up to 100° C., at which temperature said complex is a liquid.

23 . The method of claim 21 , wherein step (ii) is conducted at a temperature of up to 50° C., at which temperature said complex is a liquid.

24 . The method of claim 21 , wherein step (ii) is conducted at a temperature of up to 30° C., at which temperature said complex is a liquid.

Assignees

• Ut Battelle Llc
• Univ Tennessee Res Foundation

Inventors

• Dai Sheng
• Sun Xiao-Guang
• Fang Youxing
• Yoshii Kazuki

Classifications

• C25D3/44 Primary

  Aluminium · CPC title

• C25D5/003

  Electroplating using gases, e.g. pressure influence · CPC title

• C25D3/665 Primary

  from ionic liquids · CPC title

• C07C45/567

  with sulfur as the only hetero atom · CPC title

• C07C45/562

  with nitrogen as the only hetero atom · CPC title