Photochromic metal organic frameworks for inkless and erasable printing
AssigneeCouncil of Scientific and Industrial Research
InventorsRahul Banerjee, Bikash Garai, Arijit 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.
Claims12
A porous metal organic framework (MOF) comprising:
- BINDI (N,N′-bis(5-isophthalic acid) naphthalenediimide), and
- a metal ion selected from Mg and Sr,
- wherein the metal ion is in coordination with the four carboxylate groups of BINDI, and
- 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 BINDI and a metal salt in the presence of a suitable solvent wherein the metal salt is selected from Mg and Sr.
Dependencies are inferred from the claim text.