“…The dimensionality of OIHPs could be tuned according to (a) the chemical formula, (b) coordination geometry of the metal ion and (c) the valence of organic cation. The OIHPs could be found in different forms; 3-D of general formula AMX 3 (Cheng & Lin, 2010;Ouasri et al, 2012;Chen et al, 2015;Xing et al, 2013;Fan et al, 2018), 2-D A 2 MX 4 (Abdel-Aal et al, 2017a,b;Abdel-Aal & Abdel-Rahman, 2017;Mostafa et al, 2017a;Mondal et al, 2017;Mostafa et al, 2017b;Fredj et al, 2017;Mostafa et al, 2018;Abdel-Aal & Abdel-Rahmanet al, 2019) and 1D A 2 MX 5 (Bi et al, 2009;Ouasri et al, 2012;Dammak et al, 2015;Fredj et al, 2017), where A is organic cation, M is metal ion, X is halide Cl, Br or I. The structure tunability can be achieved by changing A, M and X.…”