Grazoprevir Hydrate/Ruzasvir/Uprifosbuvir

A stable and efficient hole-transport material (HTM) is crucial for high-performance perovskite solar cells (PSCs). A 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (Spiro-MeOTAD) being used widely to prepare highly efficient PSCs. However, Spiro-MeOTAD has some limitations due to its complex synthesis, which increases its cost, and it also requires dopants to improve its performance. Therefore, we designed thirteen unique small-molecule-based HTMs (MK1-MK13), which are easy to synthesize, highly cost-effective, and don't require dopants to prepare efficient PSCs. Their electrical and optical properties are then investigated theoretically using advanced quantum chemical approaches. The designed molecules showed lower energy gaps and improved optical and optoelectronic characteristics because of the improved phase inversion geometry. The detailed photo-physical and optoelectronic characteristics have been studied using density functional theory (DFT) and time-dependent (TD-DFT) calculations. Moreover, we investigated the impact of holes and electrons and the density of states, open-circuit voltage, frontier molecular orbital, transition density matrix, and other structural and photovoltaic characteristics of these materials. Among these, the MK3 molecule possesses the much narrower optical band gap of 1.04 eV and absorbance (λ _max) of 684 nm, respectively. In addition, a profound investigation of the MK3/PC₆₁BM blend shows excellent charge transfer at the acceptor-donor interface. Therefore, our proposed technique is necessary for generating appropriate photovoltaic materials for efficient optoelectronic devices and is helpful in further advancing the field.

Menaquinones (MKs) contain both a redox active quinone moiety and a hydrophobic repeating isoprenyl side chain of varying lengths and degrees of saturation. This characteristic structure allows MKs to play a key role in the respiratory electron transport system of some prokaryotes by shuttling electrons and protons between membrane-bound protein complexes, which act as electron acceptors and donors. Hydrophobic MK molecules with partially and fully saturated isoprenyl side chains are found in a wide range of eubacteria and archaea, and the structural variations of the MK analogues are evolutionarily conserved but poorly understood. For example, Mycobacterium tuberculosis, the causative agent of tuberculosis, uses predominantly MK-9(II-H₂) (saturated at the second isoprene unit) as its electron carrier and depends on the synthesis of MK-9(II-H₂) for survival in host macrophages. Thus, MKs with partially saturated isoprenyl side chains may represent a novel virulence factor. Naturally occurring longer MKs are very hydrophobic, whereas MK analogues that have a truncated (i.e., one to three isoprenes) isoprenyl side chain are less hydrophobic. This improves their solubility in aqueous solutions, allowing rigorous study of their structure and biological activity. We present the synthesis and characterization of two partially saturated MK analogues, MK-2(II-H₂) and MK-3(II-H₂), and two novel fully saturated MK derivatives, MK-2(I,II-H₄) and MK-3(I,II,III-H₆).