Premium
Fluorescent Magnesium(II) Coordination Polymeric Hydrogel
Author(s) -
Leong Wei Lee,
Batabyal Sudip K.,
Kasapis Stefan,
Vittal Jagadese J.
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200801129
Subject(s) - aqueous solution , biocompatibility , viscoelasticity , fluorescence , polymer , self healing hydrogels , supramolecular chemistry , materials science , polymer chemistry , chemical engineering , magnesium , molecule , covalent bond , chemistry , organic chemistry , composite material , physics , quantum mechanics , engineering
A pH and mechano‐responsive coordination polymeric gel was developed without the use of long chain hydrophobic groups. The hydrogel was synthesised by reacting the aqueous solution of Mg 2+ with the basic aqueous solution of N ‐(7‐hydroxyl‐4‐methyl‐8‐coumarinyl)‐alanine. The gelation is attributed to the self‐aggregation of 1D coordination polymers to form 3D nanostructures through non‐covalent interactions to entrap water molecules. The freeze‐dried hydrogel exhibits a fibrillar network structure with a uniform ribbon shape. UV/vis absorption studies illustrate that the hydrogel displays a typical π–π* transition. The fluorescence intensity of the hydrogel is enhanced drastically with a longer lifetime upon gel formation. Mechanical analysis including dynamic oscillation on shear, steady shear and creep (retardation‐relaxation) testing have been performed to elucidate the supramolecular nature of the 3D assembly. Together with the viscoelastic properties and biocompatibility, the Mg 2+ hydrogel may find utility as a novel soft material in biomedical applications.