Immobilization of 2,2′-bipyridine-5,5′-dicarboxylic acid in layered octacalcium phosphate

• Published in: Colloid and interface science communications Vol. 30; p. 100182
• Main Authors: Yamada, Iori, Tagaya, Motohiro
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2019
• Subjects: Bioceramics; Bipyridine; Inorganic/organic nanohybrids; Luminescence; Octacalcium phosphate; Bioceramics; Inorganic/organic nanohybrids; Octacalcium phosphate; Bipyridine; Luminescence
• ISSN: 2215-0382; 2215-0382
• DOI: 10.1016/j.colcom.2019.100182

Immobilization of 2,2′-bipyridine-5,5′-dicarboxylic acid (Bpdc) into layered octacalcium phosphate was investigated in the hydrolysis process of α-tricalcium phosphate. 100 interlayer distance altered from 1.9 to 2.5–2.7 nm by the immobilization, suggesting the novel inorganic/organic nanohybrids. The nanohybrids exhibited the blue-shifted photoluminescence peaks with the higher internal quantum efficiency as compared with the case in the Bpdc alone.
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•Octacalcium phosphate (OCP) and 2,2′-bipyridine-5,5′-dicarboxylic acid (Bpdc) were hybridized.•Bpdc ion was successfully replaced with HPO42− ion of the hydrated layer of OCP.•The replacement degree with HPO42− ion depended on the feed Bpdc concentration.•The OCP/Bpdc hybrids exhibited blue luminescence with the higher quantum efficiency.