Phosphate and polyphosphate anions recognition by a dinuclear copper(II) complex of an unsymmetrical squaramide Catarina V. Esteves, a Judite Costa, b David Esteban-Gómez, c Pedro Lamosa, a Hélène Bernard, d Carlos Platas-Iglesias, c Raphäel Tripier, d Rita Delgado a * Electronic Supplementary Information (ESI) Electronic Supplementary Material (ESI) for Dalton Transactions. This journal is © The Royal Society of Chemistry 2019