Distinguishing polymorphs of the semiconducting pigment copper phthalocyanine by solid-state NMR and Raman spectroscopy.

Distinguishing polymorphs of the semiconducting pigment copper phthalocyanine by solid-state NMR and Raman spectroscopy.
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DOI:
10.1021/jp9061412
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发表时间:
2010-04-08
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Ishii Y
Ishii Y
中科院分区:
其他
文献类型:
--
作者:
Shaibat MA;Casabianca LB;Siberio-Pérez DY;Matzger AJ;Ishii Y

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Cu(II)(酞菁) (CuPc) 被广泛用作原型分子半导体,并且是使用最广泛的蓝色印刷颜料。 CuPc 有六种不同的结晶形式;化学和物理性质基本上是通过这些多晶型物中的分子堆积来调节的。尽管该系统的重要性日益增加,但对 CuPc 不同多晶型物的光谱鉴定仍然存在困难。这项研究首次展示了通过固态核磁共振 (SSNMR) 和拉曼光谱对最广泛使用的多晶型 CuPc 的 α 型和 β 型进行光谱区分的例子。使用 20 kHz 极快魔角旋转 (VFMAS) 获得的 α- 和 β-CuPc 的 13C 高分辨率 SSNMR 谱表明,超精细位移敏感地反映了 CuPc 的多晶型。实验结果通过从头算化学位移计算得到证实。 VFMAS 下 α-CuPc 和 β-CuPc 的 13C 和 1H SSNMR 弛豫时间也显示出显着差异,可能是因为两种形式的电子自旋相关时间不同。拉曼光谱还提供了另一种区分两种多晶型物的可靠方法。
Cu(II)(phthalocyanine) (CuPc) is broadly utilized as an archetypal molecular semiconductor and is the most widely used blue printing pigment. CuPc crystallizes in six different forms; the chemical and physical properties are substantially modulated by its molecular packing among these polymorphs. Despite the growing importance of this system, spectroscopic identification of different polymorphs for CuPc has posed difficulties. This study presents the first example of spectroscopic distinction of α- and β-forms of CuPc, the most widely used polymorphs, by solid-state NMR (SSNMR) and Raman spectroscopy. 13C high-resolution SSNMR spectra of α- and β-CuPc using very-fast magic angle spinning (VFMAS) at 20 kHz show that hyperfine shifts sensitively reflect polymorphs of CuPc. The experimental results were confirmed by ab initio chemical shift calculations. 13C and 1H SSNMR relaxation times of α- and β-CuPc under VFMAS also showed marked differences, presumably because of the difference in electronic spin correlation times in the two forms. Raman spectroscopy also provided another reliable method of differentiation between the two polymorphs.
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影响因子: 15
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