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- W2005859825 abstract "Abstract Unsymmetrical metal‐free and zinc complexes of pyrazino‐quinoxalino‐porphyrazines (PQP) bearing eight diethylamino groups have been synthesized by statistical tetramerization of 2,3‐bis(diethylamino)quinoxaline‐6,7‐dicarbonitrile and 5,6‐bis(diethylamino)pyrazine‐2,3‐dicarbonitrile in lithium butanolate. For this purpose, a new heteroatom‐substituted quinoxaline precursor, 2,3‐dichloro‐6,7‐dicarbonitrile, was prepared and characterized. It is a flexible starting material for new building blocks of quinoxaline‐6,7‐dicarbonitrile derivatives. All the PQPs (including adjacent and opposite isomers) from the statistical mixture were detected and separated by column chromatography on silica and characterized by MALDI‐TOF mass spectrometry, IR, UV/Vis and NMR spectroscopy. The effect of the insertion of benzene rings into the tetrapyrazinoporphyrazine (TPP) system is discussed. Each benzene ring insertion into the TPP system causes a bathochromic shift of 22 nm; the dependence is linear. The final tetra[6,7]quinoxalinoporphyrazines were red‐shifted to 744 and 763 nm for the zinc and metal‐free derivative, respectively. Splitting of the Q‐band was observed for PQPs with lower symmetry.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)" @default.
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- W2005859825 date "2007-08-31" @default.
- W2005859825 modified "2023-09-29" @default.
- W2005859825 title "Synthesis, Separation and UV/Vis Spectroscopy of Pyrazino-quinoxalino-porphyrazine Macrocycles" @default.
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- W2005859825 doi "https://doi.org/10.1002/ejoc.200700275" @default.
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