Enhanced Interlayer Interaction and Second-Harmonic-Generation Response in a KBe2BO3F2-Type Inorganic-Organic Hybrid Zinc Borate

A new inorganic-organic hybrid zinc borate was prepared under hydrothermal conditions. This compound is the first KBe₂BO₃F₂ (KBBF) derivative with zinc borate layers linked by mononegatively charged amino acids. Notably, it exhibits a relatively large second-harmonic-generation response of about 2.0 times that of KBBF and a moderate birefringence for phase matching in the UV region. The enhanced interlayer interaction was evaluated by theoretical calculations based on density functional theory.

BO3 Triangle and B@Zn2O3 Cationic Layer in the Structure of the Hybrid Zinc Acetate Borate [ZnAc]·[ZnBO3]

A zinc acetate borate, [ZnAc]·[ZnBO₃] (1), was synthesized under mild conditions; the B@Zn₂O₃ layer of 1 contains a 6-membered ring embedded with a rare BO₃ unit. The layers are pillared by acetate ions to form a 3D framework. The pillared structure of 1 supplies enough space as a nanoreactor, and the related application of CO₂-to-CO reduction has been confirmed.

Multimetal organic frameworks as drug carriers: aceclofenac as a drug candidate

BACKGROUND

Multimetal organic frameworks (M-MOFs) were synthesized by including a second metal ion with the main base metal in the synthesis process to enhance their applications for drug delivery. Aceclofenac (ACF), a nonsteroidal anti-inflammatory analgesic drug of low aqueous solubility, was selected as a candidate for the drug delivery system.

PURPOSE

This study aimed to evaluate the loading capacity (LC) and entrapment efficiency (EE) percentages of multi-Material of Institute Lavoisier (MIL)-100(Fe) (M-MIL-100(Fe)) for ACF.

MATERIALS AND METHODS

Hydrothermal synthesis procedure was used to prepare multi-MIL-100(Fe) samples (Zn I-MIL-100(Fe), Zn II-MIL-100(Fe), Ca I-MIL-100(Fe), Ca II-MIL-100-(Fe), Mg I-MIL-100(Fe), Mg II-MIL-100(Fe), Mn I-MIL-100(Fe), and Mn II-MIL-100(Fe)). The characterization of M-MIL-100(Fe) samples was evaluated by X-ray powder diffraction (XRD), Fourier transform infrared spectra, scanning electron microscope (SEM), TGA, and N2 adsorption isotherms. The LC of M-MIL-100(Fe) and EE of ACF were determined. Nuclear magnetic resonance (NMR) and zeta-potential analyses were employed to confirm qualitatively the drug loading within M-MIL-100(Fe).

RESULTS

The ACF LC of MIL-100(Fe) was 27%, whereas the LC of M-MIL-100(Fe) was significantly increased and ranged from 37% in Ca I-MIL-100(Fe) to about 57% and 59% in Mn II-MIL-100(Fe) and Zn II-MIL-100(Fe), respectively. The ACF@M-MOFs release profiles showed slow release rates in phosphate buffer solutions at pH 6.8 and 7.4 as compared to the ACF@MIL-100(Fe).

CONCLUSION

Therefore, M-MOFs showed a significant potential as a carrier for drug delivery systems.

Mixed-metal or mixed-linker metal organic frameworks as heterogeneous catalysts

This review illustrates the recent developments in heterogeneous catalysis using mixed metal or mixed linker MOFs.