The review shall introduce and analyse the current developments in the chemical modification of native amino acids on peptides or proteins and their applicability to ADC linkers.

We have synthesized ac ompletely new family of acyclic trimeric cyclodiphosphazane compounds comprising NH, N i Pr,N t Bu and NPh bridging groups.Inaddition, the first NH-bridged acyclic dimeric cyclophosphazane has been produced. The trimeric species display highly tuneable characteristics so that the distance between the terminal N(H)R moieties can be readily modulated by the steric bulk present in the bridging groups (ranging from % 6t o% 10). Moreover, these species exhibit pronounced topological changes when aw eak non-bonding NH•••p aryl interaction is introduced. Finally,t he NH-bridged chloride binding affinities have been calculated and benchmarked along with the existing experimental data available for monomeric cyclodiphosphazanes. Our results underscore these species as promising hydrogen bond donors for supramolecular host-guest applications.

No abstract

We have synthesized ac ompletely new family of acyclic trimeric cyclodiphosphazane compounds comprising NH, N i Pr,N t Bu and NPh bridging groups.Inaddition, the first NH-bridged acyclic dimeric cyclophosphazane has been produced. The trimeric species displayh ighly tuneable characteristics so that the distance between the terminal N(H)R moieties can be readily modulated by the steric bulk present in the bridging groups (ranging from % 6to% 10). Moreover,these species exhibit pronounced topological changes when aw eak non-bonding NH•••p aryl interaction is introduced. Finally,the NH-bridged chloride binding affinities have been calculated and benchmarked along with the existing experimental data available for monomeric cyclodiphosphazanes.O ur results underscore these species as promising hydrogen bond donors for supramolecular host-guest applications.

Artificial molecular machines have captured the full attention of the scientific community since Jean-Pierre Sauvage, Fraser Stoddart, and Ben Feringa were awarded the 2016 Nobel Prize in Chemistry. The past and current developments in molecular machinery (rotaxanes, rotors, and switches) primarily rely on organic-based compounds as molecular building blocks for their assembly and future development. In contrast, the main group chemical space has not been traditionally part of the molecular machine domain. The oxidation states and valency ranges within the p-block provide a tremendous wealth of structures with various chemical properties. Such chemical diversitywhen implemented in molecular machinescould become a transformative force in the field. Within this context, we have rationally designed a series of NH-bridged acyclic dimeric cyclodiphosphazane species, [(μ-NH){PE(μ-NtBu)2PE(NHtBu)}2] (E = O and S), bis-PV 2N2, displaying bimodal bifurcated R2 1(8) and trifurcated R3 1(8,8) hydrogen bonding motifs. The reported species reversibly switch their topological arrangement in the presence and absence of anions. Our results underscore these species as versatile building blocks for molecular machines and switches, as well as supramolecular chemistry and crystal engineering based on cyclophosphazane frameworks.