Optical detection of parts-per-million (ppm) levels of CO by a structurally well-defined monolayer consisting of bimetallic rhodium complexes on glass substrates has been demonstrated.

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The thioethers 2-pyridylmethyl p-tolyl sulfide (a) and p-chlorophenyl 2-pyridylmethyl sulfide (b) react with the precursors cis-[RuCl 2 (N,N-diimine) 2 ] [diimine = di-2-pyridyl sulfide (dps), 1; 2,2Ј-bis(4-methylpyridyl) sulfide (4mdps), 2; 2,2Ј-bis(5-methylpyridyl) sulfide (5mdps), 3; di-2-pyrimidyl sulfide (dprs), 4; and 2,2Ј-bis(5-ethylpyrimidyl) sulfide (5edprs), 5] in the presence of NH 4 PF 6 to give the complexes [Ru(N,Ndiimine) respectively. As a consequence of the N,S chelation all the complexes contain a five-membered RuSCCN(Ru−N) ring, the sulfur and ruthenium atoms of which are stereogenic centres, with (R) and (S) and ∆ and Λ configurations, respectively. Furthermore, the coordinated thioethers contain anisochronous methylene protons and phenyl protons which are sensor nuclei for pyramidal sulfur inversion and rotation of the pendant phenyl ring, respectively. In the low-temperature 1 H NMR spectra of the complexes a single AB system for the methylene protons, in agreement with a fast sulfur inversion, is observed. Well-separated signals of the two ortho-as well as the meta-phenyl protons, indicating restricted phenyl rotation, are also observed. At higher temperatures

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This review offers an overview of the most recent research activities on counteracting the biodeterioration process of stone monuments, underlining all those aspects regarding eventual procedural drawbacks and compliance with sustainable criteria. For this purpose, the definition of “green conservation of cultural heritage” has been proposed. Its basics have been utilized in the text to highlight the issues arising from the most common conservative procedures as well as guidelines for the development of innovative technologies. The review then deals with the most innovative antimicrobial approaches, among which nano- and bio-technologies play a main role. Ionic liquids are a special class of salts, which can be prepared by applying Safe by Design concepts, to meet the Green Conservation criteria.