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Formation and stability of cellulose–copper–NaOH crystalline complex

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Abstract

We investigated the crystal structure of alkali-celluloses, Na-cellulose IIA and II(Cu), formerly known as Na-cellulose IIB, by synchrotron X-ray diffraction. Na-cellulose IIA, formed from cellulose I by high-concentration NaOH treatment, has a fiber repeat of 15 Å and a threefold-like helical conformation. Na-cellulose II(Cu), prepared by treating cellulose I with copper-saturated alkali solution, also has a fiber repeat of 15 Å with threefold helical symmetry. Incorporation of Cu(II) ions into cellulose was confirmed by multiwavelength anomalous diffraction. Monitoring by X-ray diffraction revealed that the formation of this complex from cellulose I is remarkably slow, probably because of the involvement of copper ion. The stability of alkali-cellulose II(Cu) was tested to estimate the influence of the presence of copper in the crystal. Na-cellulose II(Cu) characteristically dissolved in aqueous ammonia solution, indicating strong coordination of copper ion to cellulose.

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Acknowledgments

The authors thank the Japan Synchrotron Research Institute (JASRI) for provision of BL40B2 beam time at SPring-8 (2012A1549). We thank Dr. Y. Nishiyama for valuable discussions and comments during the writing of this work. This study was supported by a grant-in-aid for JSPS fellows (no. 23-2362).

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Correspondence to Yu Ogawa.

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Ogawa, Y., Hidaka, H., Kimura, S. et al. Formation and stability of cellulose–copper–NaOH crystalline complex. Cellulose 21, 999–1006 (2014). https://doi.org/10.1007/s10570-013-9977-4

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  • DOI: https://doi.org/10.1007/s10570-013-9977-4

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