The Schiff base N,NЈ-bis(salicylidene)-1,5-diamino-3-oxapentane (H 2 L) and its lanthanide(III) complexes, PrL(NO 3 )(DMF)(H 2 O) (1) and Ho 2 L 2 (NO 3 ) 2 ·2H 2 O (2), were synthesized and characterized by physicochemical and spectroscopic methods. Single crystal X-ray structure analysis revealed that complex 1 is a discrete mononuclear species. The Pr III ion is nine-coordinate, forming a distorted capped square antiprismatic arrangement. Complex 2 is a centrosymmetric dinuclear neutral entity in which the Ho III ion is eight-coordinate with distorted square antiprismatic arrangement. The DNA-binding proper-

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An erbium (III) complex of a pentadentate Schiff base ligand [(NO 3 )Er(µ-L) 2 Er(NO 3 )].2H 2 O [H 2 L=bis(N-salicylidene)-3oxapentane-1,5-diamine] has been synthesised, characterised and its structure confirmed by X-ray crystallography. H 2 L and the Er(III) complex both bind to DNA via a groove binding mode, and the Er(III) complex binds to DNA more strongly than H 2 L. The complex shows strong scavenging effects for hydroxyl radicals (OH·) and superoxide radicals (O 2 −· ).

V-shaped ligand bis(2-benzimidazolylmethyl)amine containing three copper(II) ternary complexes: synthesis, structure, DNA-binding properties and antioxidant activity †

Three novel structure Ag(i) complexes have been synthesized and characterized. The three ligands and Ag(i) complexes bind to DNA in an intercalation mode. The Ag(i) complexes have stronger ability of antioxidation for hydroxyl radical and superoxide radical.

Nonfullerene‐acceptor‐based organic solar cells (NFA‐OSCs) are now set off to the 20% power conversion efficiency milestone. To achieve this, minimizing all loss channels, including nonradiative photovoltage losses, seems a necessity. Nonradiative recombination, to a great extent, is known to be an inherent material property due to vibrationally induced decay of charge‐transfer (CT) states or their back electron transfer to the triplet excitons. Herein, it is shown that the use of a new conjugated nitroxide radical polymer with 2,2,6,6‐tetramethyl piperidine‐1‐oxyl side groups (GDTA) as an additive results in an improvement of the photovoltaic performance of NFA‐OSCs based on different active layer materials. Upon the addition of GDTA, the open‐circuit voltage (VOC), fill factor (FF), and short‐circuit current density (JSC) improve simultaneously. This approach is applied to several material systems including state‐of‐the‐art donor/acceptor pairs showing improvement from 15.8% to 17.6% (in the case of PM6:Y6) and from 17.5% to 18.3% (for PM6:BTP‐eC9). Then, the possible reasons behind the observed improvements are discussed. The results point toward the suppression of the CT state to triplet excitons loss channel. This work presents a facile, promising, and generic approach to further improve the performance of NFA‐OSCs.

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