Application of Discrete First‐Row Transition‐Metal Complexes as Photosensitisers. Issue 12 (2nd December 2020)

• Record Type: Journal Article
• Authors: Behm, Kira; McIntosh, Ruaraidh D.
• Is Part Of: ChemPlusChem. Volume 85:Issue 12(2020)
• Page Start: 2611
• Page End: 2618
• Publication Date: 2020-12-02
• Subjects: charge transfer -- luminescence -- photocatalysis -- photosensitisers -- transitionmetal complexes; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.202000610
• Languages: English
• ISSNs: 2192-6506

Abstract

Abstract: This Minireview summarises and critically evaluates recent advances in the utilisation of discrete first‐row transition‐metal (TM) complexes as photosensitisers. Whilst many compounds absorb light, TM complexes are generally more desirable for photochemical applications, as they usually exhibit strong absorption of visible light, making them ideally suited to exploiting the sun as a freely available light source. Due to their outstanding activities, precious metals, such as iridium and ruthenium, are currently still at the forefront of photochemistry research. However, they also bear disadvantages with respect to abundance, cost and toxicity. Therefore, it is desirable to move to more abundant and less expensive systems that retain good photosensitising abilities. This Minireview will focus on first‐row transition‐metals, specifically titanium, copper, iron, and zinc, which have become the focus of increased attention over recent years as potential replacements for noble metals as photosensitisers. Their structure – activity relationships are explored and challenges in designing the ligands and complexes are discussed. Abstract : First‐row is first rate ! Recent advances in the utilisation of discrete first‐row transition‐metal complexes as photosensitisers are summarised and discussed in this Minireview. Complexes of Ti, Cu, Fe, and Zn are highlighted, as these dominate the literature on applied photosensitisers. Even though first‐row transition‐metal complexes exhibit lower activity than established precious‐metal complexes, they are of crucial interest as they are generally more sustainable and less expensive than their second‐and third‐row counterparts.