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https://pure.psu.edu/en/publications/spiroconjugated-intramolecular-charge-transfer-dyes/ Spiroconjugated Intramolecular Charge-Transfer Dyes - Penn State charge transfer dyes penn state https://pure.psu.edu/en/publications/optical-properties-of-spiroconjugated-charge-transfer-dyes/ Optical properties of spiroconjugated charge-transfer dyes - Penn State optical properties charge transfer dyes penn