Patent ID: 7591990

Claim:
A process for preparing a compound of formula M 3 M 1 A 2 , said process comprising reacting a compound of formula M 2 M 1 A 2 with a compound of formula M 3 X 2 , in the presence of at least one coordinating solvent, in order to obtain said compound of formula M 3 M 1 A 2 , wherein M 1 is chosen from B 3+ , Al 3+ , Ga 3+ , In 3+ , Tl 3+ , Fe 3+ , and Au 3+ ; M 2 is chosen from Li + , Na + , K + , Cs + , (T 1 ) 3 Si—, and N(T 2 ) 4 + , wherein each T 1 independently represents a C 1 -C 6 alkyl which is linear or branched, and each T 2 independently represents a hydrogen atom, or a C 1 -C 6 alkyl which is linear or branched; M 3 is chosen from Cu + , Ag + , Li + , Na + , K + , Cs + , Rb + , Fr + , Au + , and Hg + ; A is chosen from S, Se, and, Te; X 2 is chosen from Cl − , Br − , I − , F − , CH 3 COO − , NO 3 − , OCN − , SCN − , and CN − ; and said coordinating solvent is chosen from wherein R 1 , R 2 , R 3 and R 4 are the same or different and are chosen from a hydrogen atom, C 1 -C 12 alkyl which is linear or branched, C 3 -C 12 cycloalkyl, C 1 -C 12 heterocyclyl, C 2 -C 8 alkenyl, C 2 -C 8 alkynyl, C 6 -C 12 aryl, C 6 -C 20 aralkyl, C 6 -C 20 alkylaryl, and C 1 -C 12 heteroaryl, R 1 and R 2 may be joined together to form a 5 to 14 membered heterocyclyl or is a part of polymer chain or network.