Jing Huang, Tong-Peng Liu, L. Huo
Jan 5, 2017
Citations
0
Influential Citations
2
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract Assembly of six isomeric pyridine-diamine-based molecules, N,N′ -bis(pyridin-4-ylmethyl)ethane-1,2-diamine (M1), N,N′ -bis(pyridin-3-ylmethyl)ethane-1,2-diamine (M2), N,N′ -bis(pyridin-2-ylmethyl)ethane-1,2-diamine (M3), N,N′ -bis(pyridin-4-ylmethyl)propane-1,3-diamine (M4), N,N′ -bis(pyridin-3-ylmethyl)propane-1,2-diamine (M5), and N,N′ -bis(pyridin-2-ylmethyl)propane-1,3-diamine (M6), with phosphoric acid (H 3 PO 4 ) in different ratio (1:2 and 1:4), leads to the formation of nine salts, H 2 M1 2+ ·2H 2 PO 4 − ·4H 2 O ( 1 ), H 2 M2 2+ ·2H 2 PO 4 − ·2H 2 O ( 2 ), H 2 M3 2+ ·2H 2 PO 4 − ·2H 2 O ( 3 ), H 4 M1 4+ ·4H 2 PO 4 − ( 4 ), H 4 M2 4+ ·4H 2 PO 4 − ( 5 ), H 4 M3 4+ ·4H 2 PO 4 − ( 6 ), H 2 M4 2+ ·2H 2 PO 4 − ·3H 2 O ( 7 ), 2H 2 M5 2+ ·4H 2 PO 4 − ·2H 3 PO 4 ( 8 ), and H 2 M6 2+ ·2H 2 PO 4 − ( 9 ), which have been characterized by elemental analysis, IR, TG, PL, powder and single-crystal X-ray diffraction. Structural analyses indicate that hydrogen-bonding patterns of H 2 PO 4 − anions, conformation of protonated cations can effectively influence the supramolecular architectures through diverse non-covalent interactions. Hydrous salts 1–3 and 7 present 2D and 3D host-guest supramolecular networks, in which the connection of H 2 PO 4 − anions and water molecules generates diverse tape and layer motifs. H 2 PO 4 − anions in anhydrous salts 4–6 interconnect with each other through hydrogen bonds to form two types of layers, which are joined by discrete H 4 M 4+ cations into 3D inorganic-organic hybrid supramolecular networks. Salts 8–9 also present 2D and 3D host-guest supramolecular networks where the interconnection of H 2 PO 4 − anions and its combination with H 3 PO 4 molecules leads to diverse layers. Luminescent analyses indicate that salts 1–9 exhibit violet and blue emission maximum in the range of 390–467 nm at room temperature.