Abstract
Chemistry of Schiff base (SB) ligands began in 1864 due to the discovery made by Hugo Schiff (Schiff, H., Justus Liebigs Ann. der Chemie 1864, 131 (1), 118–119). However, there is still a vivid interest in coordination compounds based on imine ligands. The aim of this paper is to review the most recent concepts on construction of homo- and hetero-oligonuclear Schiff base coordination compounds narrowed down to the less frequently considered complexes of platinum group metals (PGM). The combination of SB and PGM in oligonuclear entities has several advantages over mononuclear or polynuclear species. Such complexes usually exhibit better electroluminescent, magnetic and/or catalytic properties than mononuclear ones due to intermetallic interactions and frequently have better solubility than polymers. Various construction strategies of oligodentate imine ligands for coordination of PGM are surveyed including simple imine ligands, non-innocent 1,2-diimines, chelating imine systems with additional N/O/S atoms, classic N2O2-compartmental Schiff bases and their modifications resulting in acyclic fused ligands, macrocycles such as calixsalens, metallohelical structures, nano-sized molecular wheels and hybrid materials incorporating mesoionic species. Co-crystallization and formation of metallophilic interactions to extend the mononuclear entities up to oligonuclear coordination species are also discussed.
Highlights
The present paper focuses on homo- and hetero-oligonuclear Schiff base (SB) complexes of platinum group metals (PGM), which are rarely considered in numerous comprehensive reviews despite of their great importance
The present review is divided into eight sections related to various structural approaches to obtain homo- and hetero-oligonuclear coordination PGM compounds incorporating imine ligating sites
The usage of widely studied N2O2 Schiff base compartmental ligands is summarized
Summary
The present paper focuses on homo- and hetero-oligonuclear Schiff base (SB) complexes of platinum group metals (PGM), which are rarely considered in numerous comprehensive reviews despite of their great importance.The reaction between carbonyl compound and primary amine discovered by Hugo Schiff in 1864 [1] gave basis for further research in various scientific fields and resulted in thousands of papers being submitted by scientists all over the world to a diverse spectrum of scientific magazines. The present paper focuses on homo- and hetero-oligonuclear Schiff base (SB) complexes of platinum group metals (PGM), which are rarely considered in numerous comprehensive reviews despite of their great importance. The reports cover synthesis of new organic and coordination compounds, their luminescent, magnetic, catalytic or bioactive properties up to advanced applications in many industries such as dye-sensitized solar cells. The topic seems to be quite old and exploited, several scientific groups worldwide are still studying the great potential of this group of compounds finding new applications for the imine based ligands and their complexes. The azomethine molecular fragment is used as a structural element for the synthesis of polydentate ligands of various structures up to mechanically interlocked molecular architectures such as metallacycles, cages or knots [2,3,4]
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