The Crystalline Porous Polymeric materials (CPPs) also well known as Covalent Organic Frameworks (COFs) have concerned substantial research interest because of their extensive applications in molecular storage and separation, catalysis, sensing, opto-electronics etc. [1]. The overall properties and real time employments of such materials not only rely on the compositions but also their nano-scale morphology which plays an incredible role [2]. Therefore, an explicit understanding of the morphology-modulation with respect to their constituents is really demanding. This study accounted a detailed molecular level investigation on morphological evaluation in COFs emanates entirely from its primary building units. Here two new highly crystalline, permanently porous imine linked based COFs named 2,3-DhaTta (Surface area 1700 m2/g) and 2,3-DhaTab (Surface area 413 m2/g) was solvothermally synthesised by faintly varying linker core while retaining all other external factors unchanged. These COFs are found to self template into diverge morphologies including ribbons (2,3-DhaTta) and hollow spheres (2,3-DhaTab). Their mechanisms of formation have been thoroughly and systematically investigated where hollow sphere formation in this case was guided by inside out Ostwald Ripening phenomenon. Moreover, based on DFT (Density Functional Theory) study a significant correlation between stacking energy of two adjacent COF layers with their backbone planarity was established which was believed to be the predominant guiding factor for governing their crystallinity, porosity and morphological diversity evaluation [3].

Perovskite solar cells (PSCs) represent undoubtedly the most significant breakthrough in photovoltaic technology since the 1970s, with an increase in their power conversion efficiency from less than 5% to over 22% in just a few years. Hole-transporting materials (HTMs) are an essential building block of PSC architectures. Currently, 2,2 ,7,7 -tetrakis-(N,N -di-p-methoxyphenylamine)-9,9 -spirobifluorene), better known as spiro-OMeTAD, is the most widely-used HTM to obtain high-efficiency devices. However, it is a tremendously expensive material with mediocre hole carrier mobility. To ensure wide-scale application of PSC-based technologies, alternative HTMs are being proposed. Solution-processable HTMs are crucial to develop inexpensive, high-throughput and printable large-area PSCs. In this review, we present the most recent advances in the design and development of different types of HTMs, with a particular focus on mesoscopic PSCs. Finally, we outline possible future research directions for further optimization of the HTMs to achieve low-cost, stable and large-area PSCs.

Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole‐transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo‐functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level alignment. Thanks to the compact and ordered interface, PFI displays increased resistance to solvent exposure compared to its not‐interacting counterpart. Moreover, PFI devices show suppressed nonradiative recombination and reduced hysteresis, with a Voc enhancement of ≥20 mV and a remarkable stability, retaining more than 90% efficiency after 550 h of continuous maximum‐power‐point tracking. This work highlights the potential that XB can bring to the context of PSCs, paving the way for a new halo‐functional design strategy for charge‐transport layers, which tackles the challenges of charge transport and interface improvement simultaneously.

Organic hole-transporting materials (HTMs), AZO-I and AZO-II, were synthesized via Schiff base chemistry by functionalizing a phenothiazine core with triarylamine(s) through azomethine bridges. Substantial enhancements in the power conversion efficiency (PCE = 12.6% and 14% for AZO-I and AZO-II, respectively) and stability (68% or 91% of PCE retained after 60 days for AZO-I or AZO-II, respectively) of perovskite solar cells (PSCs) were achieved when switching from mono-(AZO-I) to disubstituted (AZO-II) HTMs. The extremely low production costs (9 and 12 $/g for AZO-I and AZO-II, respectively), together with the Pd-catalyst-free synthesis, make these materials excellent candidates for lowcost and eco-friendly PSCs.

Two new solution processable pyrene based electroluminescent organic semiconductors (PY-PH & PY-CA) and their OLED performance reported.

Tw on ew chemically stable triazine-and phenylcore-based crystalline porous polymers (CPPs) have been synthesized using as ingle-step template-free solvothermal route.U nique morphological diversities were observed for these CPPs [2,3-DhaTta (ribbon) and 2,3-DhaTab (hollow sphere)] by simply altering the linker planarity.Adetailed time-dependent study established as ignificant correlation between the molecular level structures of building blocks with the morphology of CPPs.M oreover,aDFT study was done for calculating the interlayer stacking energy,w hich revealed that the extent of stacking efficiency is responsible for governing the morphological diversity in these CPPs.Twodimensionalcrystallineporouspolymers(CPPs),including covalent organic frameworks (COFs) [1] and covalent triazine frameworks (CTFs), [2] are porous materials constructed by covalently linked light elements,such as C, N, O, H, B, and Si. These materials have triggered substantial research interest because of their extensive applications in molecular storage, [3] catalysis, [4] sensing, [5] and opto-electronics.[6] However,the overall properties of such porous materials do not rely only on their composition, structure,and porosity, but also on their nanoscale morphologies.[7] Therefore,a n explicit understanding of the morphology-modulation with respect to their constituents is required.[8] To achieve such am olecular level understanding, herein we report two CPPs that self-assemble to ribbon and hollow spherical [9] morphologies upon crystallization in as ingle step without any templating agents.Hollow spherical structures are considered to be ah ighly important morphology in polymeric materials owing to several potential applications.H owever,t heir existence is extremely rare and often require the usage of templating agents.[10] Thei ntermediates responsible for producing these above morphologies were prepared at different time intervals to understand the mechanism for the formation of the final morphology (at 72 h).TheC PPs reported here show high crystallinity as revealed from their PXRD patterns (Figure 1). Ahigh intense peak at 2.88 8 (2q)f or 2,3-DhaTta and 2,3-DhaTab (Figure 1e and 1f,r espectively) appear owing to the strong reflections from the 100 planes.2,3-DhaTta and 2,3-DhaTab show other minor peaks at 4.9, 5.7, 7.5, and 9.98 8 (2q)o wing to the reflections from the 110, 200, 120, and 220 planes,r espectively.P eaks at 268 8 (2,3-DhaTta) and 25.88 8 (2,3-DhaTab) correspond to their 001 plane reflections.T he d-spacing values between the 001 planes were used to calculate the p-p stacking distances between vertically stacked CPP layers [3.3 and 3.4 inthe respected CPPs].The high crystallinity of these CPPs is attributed to the presence of strong intramolecular OÀH···N hydrogen bonding [11] interactions between the imine nitrogen and the hydroxy functionality of the aldehyde core,w hich is influential in keeping the phenyl rings in one plane and increases stacking interactions within adjacent CPP layers.T og et an overview...

In this work we report the antibacterial activity of alkylaminophenols. A series of such compounds was prepared by a multicomponent Petasis-borono Mannich reaction starting from salicylaldehyde and its derivatives. The obtained compounds were tested against a large panel of microorganisms, Gram-positive and Gram-negative bacteria, and a yeast. Among the several tertiary amine derivatives tested, indoline-derived aminophenols containing a nitro group at the para-phenol position showed considerable activity against bacteria tested with minimal inhibitory concentrations as low as 1.36 μm against Staphyloccocus aureus and Mycobacterium smegmatis. Cytotoxicity of the new para-nitrophenol derivatives was observed only at concentrations much higher than those required for antibacterial activity.

In this work, three novel pyrene cored small conjugated molecules, namely 1,3,6,8-tetrakis(6-(octyloxy)naphthalene-2-yl)pyrene (PY-1), 1,3,6,8-tetrakis((E)-2-(6-(n-octyloxy)naphthalene-2-yl)vinyl)pyrene (PY-2) and 1,3,6,8-tetrakis((6-(n-octyloxy)naphthalene-2-yl)ethynyl)pyrene (PY-3) have been synthesized by Suzuki, heck and Sonogashira organometallic coupling reactions, respectively. The effects of single, double and triple bonds on their optical, electrochemical, and thermal properties are studied in detail. These are all materials fluorescent and they have been used in organic light-emitting diodes (OLEDs) and their electroluminescent properties have been studied.