A new copper(II) phosphonatobenzenesulfonate incorporating 4,4′-bipyridine (4,4′- bipy ) as auxiliary ligand has been discovered through systematic high-throughput (HT) screening of the system Cu(NO 3 ) 2 ·3H 2 O/H 2 O 3 PC 6 H 4 SO 3 H/4,4′- bipy using different solvents...