Volume 37, Issue 1

This review summarized and analyzed the structural parameters of 174 monomeric organoplatinum complexes with an inner coordination sphere of trans-PtP 2 C 2 . These complexes crystallized in four crystal systems: hexagonal (x2), orthorhombic (x13), triclinic (x76), and monoclinic (x84). These complexes, on the basis of the coordination mode of the respective donor ligands, can be divided into the seven sub-groups: Pt(PL) 2 (CL) 2 , Pt(PL) 2 (η 2 -C 2 L), Pt(η 2 -P 2 L)(CL) 2 , Pt(PL)(η 2 -P,CL)(CL), Pt(η 2 -P,CL) 2 , Pt(η 3 -P,C,PL)(CL), and Pt(η 3 -C,P,CL)(PL). The chelating ligands create 4-, 5-, 6-, 16-, 17-, 18-, and 19-membered rings. The total mean values of Pt-L bond distances are 2.055 Å (C) and 2.300 Å (P). There are examples that exist in two isomeric forms and are examples of distortion isomerism. The structural parameters of trans-PtP 2 C 2 are discussed with those of cis-PtP 2 C 2 derivatives.

In most cases, the combination of both anatase (up to 80%) and rutile (up to 20%) structures in a mixed-phase TiO 2 semiconductor results in a better photocatalytic performance compared to the pure phase. The improvement from anatase to rutile is brought about by the enhanced transportation of photogenerated electrons. This consequently results in improved efficiency of the photoelectric and photocurrent conversion. This review highlights the effects of the morphology, particle size, and crystal structure of mixed-phase TiO 2 toward the photodegradation of water pollutants. It was demonstrated that the synergistic effect between anatase and rutile TiO 2 due to the interfacial electron transfer from rutile to anatase improved the photocurrent as well as the overall conversion efficiency of the anatase photoanodes. The morphologies of mixed-phase TiO 2 also contributed to the final photodegradation properties. The charge and electron transfer of mixed-phase TiO 2 improved the 1D structure. This consequently enables photodegradation at the visible light range.

Silver(I)- N -heterocyclic carbene (Ag(I)-NHC) complexes of mononuclear and binuclear species, synthesised by our group and others in recent years, offer a fascinating outlook on their bioactivity. These complexes advance a range of adaptable structural patterns, leading to intra-specific variation in anticancer and antimicrobial activities. This study therefore reviews the synthesis, structural analysis and bioactivity of Ag complexes derived from mononuclear-NHC complexes either with coordinating or non-coordinating anions and binuclear NHC complexes. Specifically, the effect of stability, chain lengths and lipophilicity on the biological activity of recently reported Ag(I)-NHC complexes is reviewed. These complexes can be further explored as novel antibacterial and anticancer drugs in the nearest future.