Herein we report on the synthesis and some aspects of the chemistry of the new redox‐active ligands 2,3,5,6‐tetrakis(tetramethylguanidino)pyridine, 2,3,5,6‐tetrakis(tetramethylguanidino)‐p‐benzoquinone and 2,3,5,6‐tetrakis(N,N′‐dimethyl‐N,N′‐ethyleneguanidino)‐p‐benzoquinone. All three ligands are strong electron donors. In addition, the p‐benzoquinone systems feature low LUMO energies and small HOMO–LUMO gaps. A comparison of the ligands was made with regard to their optical properties, Brønsted basicity and electron‐donor properties; results of quantum chemical calculations were included in this comparison. Subsequently, dinuclear copper complexes were prepared. Preliminary experiments on their redox chemistry followed.

Due to their high basicity, guanidines are versatile ligand systems. In principal, they could use both their imino and amino nitrogen to establish a dative metal–N bond. However, generally only the imino N of a guanidine ligand is bound to a metal. Herein we present some examples in which both the imino and amino groups of guanidine ligands are directly engaged in the bonding to a metal ion. Under certain conditions the amino group could establish an additional link to a metal center acting as a hemilabile ligand. This result is likely to be of relevance for catalytic reactions, demonstrating the possibility to stabilize a vacancy at the metal (for instance generated by ligand dissociation).

Herein, we report a rational synthetic access to dinuclear Cu II complexes with radical monocationic guanidine ligands. The starting point was the first directed synthesis of a dinuclear Cu II complex of the redox-active, neutral guanidino-functionalized aromatic (GFA) compound 1,2,4,5-tetrakis(tetramethylguanidino)benzene (1) as ligand by treatment of 1 with Cu(OAc) 2 . The neutral complex [1{Cu(OAc) 2 } 2 ] was then oxidized with several oxidizing reagents. With I 2 twoelectron oxidation occurred, thus leading to green salts of the dication [1{Cu(OAc) 2 } 2 ] 2+ . In contrast, with AgPF 6 or AgSbF 6 one-electron oxidation was observed to yield red salts of the monocation [1{Cu(OAc) 2 } 2 ] + , which is a three-spin system[a] Anorganisch-

Aim The study aim was to explore the physical, mental, and social effects of the COVID‐19 pandemic on Austrian nurses working in hospitals. Background The COVID‐19 pandemic required nurses to work extremely hard and over long periods, which can have physical, psychological, and social consequences. Methods This study was carried out using a qualitative descriptive design and data was collected through individual interviews using an interview guide. A qualitative content analysis was conducted taking both deductive and inductive approaches. Findings Eighteen nurses (average age of 34.7 years) participated in the study. Their general attitude and feelings regarding working during the COVID‐19 pandemic in the hospital setting were positive. Several behavioral changes in the nurses’ daily working and private daily lives were reported. Psychological impacts included the fear of infecting someone at home, insomnia, and sadness. Headaches, diarrhea, muscle tension, skin redness, and increased sweating were identified as the most common physical impacts. In terms of social impact, all nurses mentioned social isolation and the increased use of (new) media. Conclusions Working with people suffering from COVID‐19 had psychological and physical effects on caregivers. Caregivers felt socially isolated in their private environments; however, they often compensated for this isolation by using social media. Implications for nursing and implications for nursing policy Staff perceived the provision of sufficient information, regular team meetings, and the employer's positive reinforcement as supportive, enhancing their feelings of security. We recommend providing more psychological support and making structural adjustments in daily clinical practice to counteract the negative effects of working during a pandemic.

Proton-coupled electron transfer (PCET) is currently intensively studied because of itsi mportance in synthetic chemistry and biology. In recent years it was shownt hat redox-active guanidines are capable PCET reagents for the selective oxidation of organic molecules. In this work, the scope of their PCET reactivity regardingr eactions that involve CÀHa ctivation is explored and kinetics tudies carried out to disclose the reaction mechanisms. Organic molecules with potentialu pt o1 .2 Vv s. ferrocenium/ferrocene are efficiently oxidized. Reactions are initiated by electron transfer, followed by slow protont ransfer from an electron-transfer equilibrium.