Patent ID: 8361300

Claim:
A method to electrodeposit a metal on a substrate; wherein an ionic liquid of the formula N + R 5 R 6 R 7 R 8 Y − is employed as an electrolyte, and the metal source is either a metal salt added to the ionic liquid or a metal anode; wherein any one of R 5 to R 8 independently represents a hydrogen alkyl, cycloalkyl, aryl, or aralkyl group that may be substituted with a member of the group consisting of OH, CI, Br, F, I, phenyl, NH 2 , CN, NO 2 , COOR 9 , CHO, COR 9 , and OR 9 ; at least one of R 5 to R 8 is a saturated or unsaturated alkyl chain having 8 to 22 carbon atoms, and one or more of R 5 to R 8 is an oxyalkylene group wherein the alkylene is a C 1 to C 4 alkylene and the total number of oxyalkylene units is from 1 to 50 oxyalkylene units, and at least one of R 5 to R 8 is a C 1 to C 4 alkyl chain; R 9 is an alkyl or cycloalkyl group; Y − is an anion compatible with the N + R 5 R 6 R 7 R 8 ammonium cation.