“…The π-π stacks generated between the aromatic structure of Dpphen or Phen ligand and nucleobases, as well as the anionic DNA backbone to form an electrostatic attraction with the positively charged ligands (NMe 3+ ) and metals ions (In 3+ ) ( Li et al, 2016 ). Other ionized MOFs including the carboxyl-rich MOF-n family ( Yaghi et al, 1995 ), IRMOF-n family ( Eddaoudi et al, 2002 ), MIL-n family ( Dan Hardi et al, 2009 ; Naeimi and Faghihian, 2019 ), UiO-n ( Cavka et al, 2008 ; Gupta et al, 2019 ), DUT-n ( Abazari et al, 2018 ; Grunker et al, 2014 ), and imidazole-rich ZIF-n family ( Park et al, 2006 ; Sheno et al, 2019 ; Zhao et al, 2019b ), or functional groups in the ligand, such as pyridine group (-C 5 H 4 N) ( Lago et al, 2016 ), imidazolyl (-C 3 H 3 N 2 ) ( Zhao et al, 2019b ), carboxyl group (-COOH) ( Adhikari et al, 2018 ), daunosamine and amino group (-NH 2 ) ( Nezhad-Mokhtari et al, 2019 ; Xue et al, 2019 ), phenolic hydroxyl group ( Ke et al, 2019 ), might also have great potential to be adopted as a source of electrostatic interaction for nucleic acid detection owing to the protonated ligand and the charge reverses in an acidic environment. Besides, designing charged MOF is an excellent idea ( Zhao et al, 2019c ) in addition to introducing functional groups ( Ali Akbar Razavi and Morsali, 2019 ).…”