New coccine

tert-Butanol
(≥99%), alcohol (EtOH, 99.7%), manganese(II) nitrate (50 wt
% aqueous solution), and nitric acid (HNO₃, 65–68%)
were purchased from the Shanghai Chemical Reagent Company. Tetramethyl
orthosilicate (TMOS, 99.0%), methylene blue trihydrate (MB, 82%),
and hydrogen peroxide (H₂O₂, 30%) were purchased
from Adamas Reagent. Methanol (CH₃OH, 99.5%) was purchased
from Sinopharm Chemical Reagent Co., Ltd. New coccine (75.0%) was
purchased from Sigma-Aldrich. Manganese acetate (Mn(CH₃COO)₂, 98%), rhodamine 6G (95%), and methyl orange (96%)
were purchased from Aladdin. Orange II sodium salt (>85%), p-benzoquinone (99.0%), and silicon dioxide (99.5%) were
purchased from Macklin. Orange G (96%) was purchased from Meryer. l-Ascorbic acid was purchased from TCI (Shanghai) Development
Co., Ltd. Synthesis of quaternized poly(2-vinylpyridine)-b-poly(ethylene oxide) (positively charged P2MVP₁₂₈-b-PEO₄₇₇, M_w/M_n = 1.1, M_w = 34.5k,
level of quaternization is ∼90%) is described in the previous
work.^{29 (link),30 (link),63 (link)} The 1,3,5-tris(2,6-dicarboxypyridin-4-yloxymethyl)benzene
ligands (L₃) were synthesized according to the literature.^{31 (link)}