Photochromic metal organic frameworks for inkless and erasable printing
AssigneeCouncil of Scientific and Industrial Research
InventorsRahul BANERJEE, Bikash GARAI, Arjit MALLICK
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Abstract
The present invention disclose photochromic metal organic frameworks (MOFs) containing photochromic 1,4,5,8-naphthalenediimide (NDI) core and metal ions selected from Mg, Ca or Sr. The developed MOFs find application in inkless and erasable printing wherein they retain the photogenerated colour for a prolonged period of time so that the printed content remains legible/readable for reasonable time.
Claims14
1-14. (canceled)
A porous metal organic framework (MOF) comprising photochromic 1,4,5,8-naphthalenediimide (NDI) core and a metal ion, wherein the metal ion is in coordination with the four carboxylate groups of an organic ligand said metal ion selected from Mg and Sr, wherein said metal organic framework is useful for process for inkless and erasable printing.
A process for preparation of a porous metal organic framework (MOF), the process comprises solvothermal reaction between an organic BINDI linker (N,N′-bis(5-isophthalic acid) naphthalenediimide) and corresponding metal salt in presence of a suitable solvent wherein the metal salt is selected from Mg and Sr.
Dependencies are inferred from the claim text.