Synthesis, some Physicochemical and Biomedical Properties of colored Apatite‐Structured Compounds with Mn⁵⁺ and Cr⁵⁺

Abstract

Development of new non‐toxic pigments of a wide range of applications (from coloring of bone cements to aesthetic cosmetology, including tattooing) of blue and green shades is an urgent task. In the present work, colored compounds with apatite structure were synthesized by solid‐phase method. The obtained products were crystallized in hexagonal syngony of P63/m space group. The alloying elements – chromophores Mn5+ and Cr5+ in tetrahedrally coordinated positions – were responsible for sky‐blue and turquoise colors of the compounds, respectively. The conducted complex study (crystal structure, IR spectroscopy, color measurements, diffuse reflectance spectroscopy, electron paramagnetic resonance, cytotoxicity, surface morphology) of the colored compounds opens new opportunities for the development of alternative pigments of similar color range and expansion of the field of application of pigments based on compounds of apatite structural type. The results of in vitro study of cytotoxicity demonstrated the potential suitability of sky‐blue color compound (Mn‐containing apatite) for further creation of cold pigments on its basis for tattoo ink and bone cement coloring.

Hydrothermal and anion exchange synthesis of Mn(v)-doped Ba5(PO4)3Cl nano-apatite toward NIR-II temperature sensing

“…In this spectrum, an absorption band is observed near 315 nm, which is attributed to charge transfer from oxygen ions to manganese orbitals. 26 Additionally, an intense absorption band is observed around 650 nm, corresponding to Mn 5+ 3 A 2 – 3 T 1 spin-allowed transition. 27 Furthermore, the photograph of as-obtained BPCl:Mn 5+ NPs is shown in the Fig.…”

“…8,25 Furthermore, the absorption band of MnO 4 3− at 700–870 cm −1 aligns with the literature findings. 17,26 Fig. 2d depicts the Raman spectra measured from 100 to 2500 cm −1 , showing a prominent peak at 888 cm −1 attributed to MnO 4 3− incorporation.…”