Journal
POLYMERS
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/polym10020165
Keywords
coordination polymer; anion; naphthalene diimide; photochromism; electron transfer
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Funding
- Application Basis Research Project of Yunnan Province Science and Technology Department [2017FD144]
- National Natural Science Foundation of China [51764048]
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Three new cadmium coordination polymers, namely [Cd(NO3)(2)(DPNDI)(CH3OH)]center dot CH3OH(1), [Cd(SCN)(2)(DPNDI)] (2), and [Cd(DPNDI)(2)(DMF)(2)]center dot 2ClO(4) (3) (DPNDI = N, N-di(4-pyridyl)-1,4,5,8-naphthalene diimide, DMF = N, N-dimethylformamide) have been synthesized by reactions of DPNDI with Cd(NO3)(2), Cd(SCN)(2), and Cd(ClO4)(2), respectively. Compound 1 is a one-dimensional coordination polymer with strong lone pair-pi interactions between the coordinated NO3- anions and the imide ring of DPNDI; while 2 is a two-dimensional network with a (4, 4) net topology. In the case of 3, due to the presence of uncoordinated perchlorate counter ions, it exhibits a non-interpenetrated square-grid coordination polymer containing one-dimensional rhomboid channels. The structural diversity in these compounds is attributed to different coordination abilities and geometries of counter anions. Due to the presence of electron-deficient NDI moiety, the photochromic behavior of these compounds was studied. Interestingly, only compounds 1 and 3 exhibit color changes under light irradiation. The influence of the anions on the photochromism process of the NDI-based materials has been discussed.
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