US 2003/0156244 A1 · Electron-driven chirality switches

Abstract

Complexes of organic ligands with a metal ion exhibit unique conformation and spectroscopic properties upon changes in oxidation state of the metal ion. The metal is a redox-active metal ion and may possess additional ligands bonded to it. The organic ligand has three “arms” that are linked together at a central atom; each arm contains atoms that may also coordinate to the metal ion. At least two of the arms possess chromophoric properties. At least one arm contains two different groups that may coordinate to the metal ion. In one oxidation state, a first atom binds to the metal. In a second oxidation state, a second atom binds to the metal. This change in coordination of the metal ion results in a rotation of one of the arms, which changes the orientation of another group, which inverses the orientation of the two chromophoric species with respect to one another.

Claims11

Dependent claims

A coordination complex comprising:

(a) a metal ion that exists in two different oxidation states:
(b) a chiral unit that can rotate so as to obtain distinguishing physical properties;
and
(c) an organic ligand containing three arms linked together at said metal ion wherein each arm contains atoms that are capable of coordinating to the metal ion, and at least two of the arms possess chromophoric properties.

1 more element

A coordination complex having the formula:

9
wherein
A is an atom that coordinates to a metal ion;
C1 and C2 are the same or different chromophores capable of absorbing light that also contain an atom that is capable of coordinating to a metal ion, or C1 and C2 are cchromophores appended to groups containing an atom that is capable of coordinating to a metal ion;
Z is a chiral atom;
R1-R4 are linker groups selected from the group consisting of —(CH2)n—, —O—, —S—, —NR8—, carbonyl, carboxyl;
n is an integer of from 1 to 4
R8 is straight-chain or branched alkyl having from 1 to 8 carbon atoms.
R5-R7 are terminal groups selected from the group consisting of hydrogen, C1-C8 branched or straight chain alkyl groups, C6-C14 substituted or unsubstituted aromatic groups and heteroaromatic groups having from one to three hetero atoms wherein the hetero atoms are selected from the group consisting of nitrogen, sulfur, and oxygen;
and
M is a metal ion that can exist in more than one oxidation state.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/328,126Filed 16 Apr 2003

Priority

26 Jul 1999

Published

21 Aug 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C07F 1/005
Compounds containing elements of Groups 1 or 11 of the Periodic Table: without C-Metal linkages
B82Y 10/00
Nanotechnology for information processing, storage or transmission
C09K 9/02
Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some…
C07F
Acyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen

Family

Application60/145,261Us provisional application · filed 26 Jul 1999

Application09/626,167Division · filed 26 Jul 2000

Application10/328,126Division · filed 16 Apr 2003

US 2004/0212773 A9Published application

US 6,541,645 B1Related patent

US 7,024,068 B2Related patent

US 2003/0156244 A1This patent

From the US filing history. Foreign family members aren’t listed.

Electron-driven chirality switches

Life of this patent

Electron-driven chirality switches

Life of this patent

Abstract

Claims11