A titanium-based inorganic-organic hybrid solid material having an oxo to Ti ratio > 1.0, preferably ≥ 1.1, most preferably ≥ 1.2; wherein the titanium-based inorganic-organic hybrid solid material is constituted exclusively of a three-dimensional succession of building units of formula (I) below: Ti 12 O x L 3 A y (I) wherein each occurrence of L independently represents a bis-Cearyl-containing tetracarboxylate ligand having the structure of formula (II): wherein X represents a covalent bond, C=O, CH 2 , N=N, NH, O, S, SO 2 , C=C, -O-(CH 2 ) p -O-, -NH-(CH 2 ) p -NH- or -S-(CH 2 ) p -S- where p represents an integer ranging from 1 to 4; preferably C=O, CH 2 , N=N, NH, O, S, SO 2 , -O-(CH 2 ) p -O-, -NH-(CH 2 ) p -NH- or -S-(CH 2 ) p -S-; most preferably C=O, CH 2 , or N=N; each occurrence of m independently represents an integer from 1 to 3; and each occurrence of R 1 independently represents H, a halogen atom, OH, NH 2 , NO 2 or a C 1-6 alkyl, preferably each occurrence of R 1 represents H; each occurrence of A independently represents a ligand selected from HCO 2 - , MeCO 2 - , OH - , H 2 O, R 2 -(SO 3 ) - 5 R 2 -(PO 3 )H - , wherein R 2 , for each occurrence, independently represents OH, C 1-12 alkyl, C 1-12 heteroalkyl, C 6-10 aryl, C 5 - 10 heteroaryl; where each of the foregoing alkyl and heteroalkyl moiety may be linear or branched and cyclic or acyclic; x represents 15 or 18; y represents 0 or 6; the titanium atoms form a purely inorganic elementary building block constituted of titanium oxo complexes; wherein the units of formula (I) together form a three-dimensional structure that crystallizes in the hexagonal crystal system; and wherein the building unit optionally further comprises water molecules coordinated to titanium metal centers of the building units, wherein the titanium-based inorganic-organic hybrid solid material is optionally further doped with one or more metals, such as Cu, Co, Ni, Mn, V, Cr, Fe, Ru, Sn, Nb. each occurrence of L independently represents a bis-Cearyl-containing tetracarboxylate ligand having the structure of formula (II): wherein X represents a covalent bond, C=O, CH 2 , N=N, NH, O, S, SO 2 , C=C, -O-(CH 2 ) p -O-, -NH-(CH 2 ) p -NH- or -S-(CH 2 ) p -S- where p represents an integer ranging from 1 to 4; preferably C=O, CH 2 , N=N, NH, O, S, SO 2 , -O-(CH 2 ) p -O-, -NH-(CH 2 ) p -NH- or -S-(CH 2 ) p -S-; most preferably C=O, CH 2 , or N=N; each occurrence of m independently represents an integer from 1 to 3; and each occurrence of R 1 independently represents H, a halogen atom, OH, NH 2 , NO 2 or a C 1-6 alkyl, preferably each occurrence of R 1 represents H; wherein X represents a covalent bond, C=O, CH 2 , N=N, NH, O, S, SO 2 , C=C, -O-(CH 2 ) p -O-, -NH-(CH 2 ) p -NH- or -S-(CH 2 ) p -S- where p represents an integer ranging from 1 to 4; preferably C=O, CH 2 , N=N, NH, O, S, SO 2 , -O-(CH 2 ) p -O-, -NH-(CH 2 ) p -NH- or -S-(CH 2 ) p -S-; most preferably C=O, CH 2 , or N=N; each occurrence of m independently represents an integer from 1 to 3; and each occurrence of R 1 independently represents H, a halogen atom, OH, NH 2 , NO 2 or a C 1-6 alkyl, preferably each occurrence of R 1 represents H; each occurrence of A independently represents a ligand selected from HCO 2 - , MeCO 2 - , OH - , H 2 O, R 2 -(SO 3 ) - 5 R 2 -(PO 3 )H - , wherein R 2 , for each occurrence, independently represents OH, C 1-12 alkyl, C 1-12 heteroalkyl, C 6-10 aryl, C 5 - 10 heteroaryl; where each of the foregoing alkyl and heteroalkyl moiety may be linear or branched and cyclic or acyclic; x represents 15 or 18; y represents 0 or 6; the titanium atoms form a purely inorganic elementary building block constituted of titanium oxo complexes; <EOS>