Highly selective chromoionophores for ratiometric Na+ sensing based on an oligoethyleneglycol bridged bithiophene detection unit - Moser,M; Thorley,KJ; Moruzzi,F; Ponder,JF; Maria,IP; Giovannitti,A; Inal,S; McCulloch,I (JOURNAL OF MATERIALS CHEMISTRY C, 2019)