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Controlled crystallization of twinned crystalline guanine microplatelets

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Biogenic twinned microplatelets of the anhydrous guanine (AG) β form have been found in copepod cuticles and scallop eyes, which function as multilayer reflectors. In this work, twinned AG β microplatelets with morphologies such as cross-shape and square-shape were synthesized for the first time in the presence of a polyvinylpyrrolidone additive in formamide and water. The twinning angle of the two c diffraction vectors (84°) for the synthetic twinned guanine crystals is very similar to that of biogenic twinned guanine microplatelets observed in scallop eyes. The angles between the two observed c diffraction vectors of the synthetic twinned AG β form microplatelets were about 84° and 20°, while a twinning angle of 84° was observed in the biogenic twinned guanine microplatelets exposing the (100) face. We proposed a formation mechanism for the twinned guanine microplatelet crystals. The formation of the twinned crystals with angles of 84° and 20° between the c diffraction vectors might be related to the attachment of G-quartet molecular assemblies on the guanine plate-like crystals with a certain angle at the early stage of crystallization.

Graphical abstract: Controlled crystallization of twinned crystalline guanine microplatelets

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The article was received on 13 Jun 2019, accepted on 09 Aug 2019 and first published on 09 Aug 2019

Article type: Paper
DOI: 10.1039/C9CE00920E
CrystEngComm, 2019, Advance Article

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    Controlled crystallization of twinned crystalline guanine microplatelets

    Y. Ma, F. Chen, Y. Hu, Y. Liu and L. Qi, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE00920E

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