Abstract
The IR spectrum of pyromellitic diimide, HN(CO)2C6H2(CO)2NH, has been measured for polycrystalline sample. The observed bands have been assigned to the IR active fundamentals and combinations on the basis of a D2h molecular symmetry by comparison with those of pyromellitic dianhydride. Band shifts from dianhydride to diimide were observed for the 0[dbnd]C-X-C[dbnd]O fundamentals and the N-H modes have been assigned by comparison with those reported for phthalimides.

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