期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 74, 期 17, 页码 6647-6657出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo901142f
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资金
- MICINN-FEDER [CTQ2008-02942, MAT2008-06522CO2-02]
- Gobierno de Aragon-Fondo Social Europeo [E39]
Merocyanines where a polyenic spacer separates a 4H-pyran-4-ylidetic moiety and different strong organic acceptors have been synthesized. According to NMR studies and X-ray diffraction data, these compounds have weakly alternated structures and remarkably zwitterionic ground states, with a partial aromatic character that is compared to those of other pyran derivatives. The proaromaticity of the 4H-pyran-4-ylidene donor lies behind the cyanine-like behavior and low (positive or negative) second-order optical nonlinearities of the shorter derivatives. On the other hand, lengthening the pi-spacer gives rise to rapidly increasing mu beta(1907) values up to 17,400 x 10(-48) esu.
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