Organic compounds containing squaric acid or croconic acid moieties for application in electronic devices

A light-emitting device, a Schottky barrier diode, a rectifier, a field effect transistor, a photovoltaic device, a photochemical device, a memory device, a sensing device, a display, or a photo-catalytical water splitting device that comprises:

• a compound comprising a squaric acid or croconic acid group as anchoring group, said compound represented by formula (2):
• wherein, in formula (2), n is 1 or 2,
• wherein A1 is selected from the following moieties
• wherein, at each occurrence and independently:
• G is a cyclic or acyclic substituted, or straight or branched alkyl;
• f=1 or 2;
• K is O, S, or N;
• g=0 or 1,
• wherein the alkyl, alkoxy, amine, thiole group of —(K)g-(G)f can be one or more attached to the aryl and heteroaryl rings, in o-, m-, p-position.

An assembly for use in an electronic device, said assembly comprising:

• a) a conducting substrate, a semiconducting substrate, or an insulating organic or inorganic substrate, said substrate having a surface,
• b) a layer of a compound present on said surface, wherein said layer is covalently attached to said surface via the squaric acid or croconic acid group of said compound, and
• c) an organic layer, an inorganic layer, or an electrolyte layer deposited on said layer, wherein said
• said compound is a compound comprising a squaric acid or croconic acid group as anchoring group, said compound represented by formula (2):
• wherein, in formula (2), n is 1 or 2,
• wherein A1 is selected from the following moieties
• wherein, at each occurrence and independently:
• G is a cyclic or acyclic substituted, or straight or branched alkyl;
• f=1 or 2;
• K is O, S, or N;
• g=0 or 1,
• wherein the alkyl, alkoxy, amine, thiole group of —(K)g-(G)f can be one or more attached to the aryl and heteroaryl rings, in o-, m-, p-position.