1 Ruthenium and osmium.- 1.1 Introduction.- 1.2 The elements and uses.- 1.3 Halides.- 1.4 Oxides and related anions.- 1.5 Other binary compounds.- 1.6 Aqua ions.- 1.7 Compounds of ruthenium(0).- 1.8 Compounds of ruthenium(II) and (III).- 1.9 Complexes of ruthenium(IV).- 1.10 Complexes of osmium(0).- 1.11 Osmium complexes in oxidation states (II-IV).- 1.12 Compounds in high oxidation states.- 1.13 Simple alkyls and aryls.- 2 Rhodium and iridium.- 2.1 Introduction.- 2.2 The elements and uses 78 2.2.1 Extraction.- 2.3 Halides and halide complexes.- 2.4 Oxides, hydrides and other binary compounds.- 2.5 Aqua ions and simple salts.- 2.6 Compounds of rhodium(0).- 2.7 Compounds of rhodium(I).- 2.8 Rhodium(II) complexes.- 2.9 Rhodium(III) complexes.- 2.10 Iridium (I) complexes.- 2.11 Dioxygen complexes.- 2.12 Iridium(II) complexes.- 2.13 Iridium(III) complexes.- 2.14 Iridium(IV) complexes.- 2.15 Iridium(V) complexes.- 2.16 Nitrosyls of iridium and rhodium.- 2.17 Simple alkyls and aryls of iridium and rhodium.- 3 Palladium and platinum.- 3.1 Introduction.- 3.2 The elements and uses.- 3.3 Halides.- 3.4 Other binary complexes.- 3.5 Aqua ions.- 3.6 Palladium(O) and platinum(O) compounds.- 3.7 Palladium(I) and platinum(I) compounds.- 3.8 Complexes of palladium(II) and platinum(II).- 3.9 Palladium(III) and platinum(III).- 3.10 Complexes of platinum(IV).- 3.11 Complexes of palladium(IV).- 3.12 The ?-bonded organometallics of palladium(IV) and platinum(IV).- 3.13 Anti-tumour activity of platinum complexes.- 3.14 Bond lengths in palladium and platinum analogues.- 4 Silver and gold.- 4.1 Introduction.- 4.2 The elements and uses.- 4.3 Halides.- 4.4 Oxides and other binary compounds.- 4.5 Aqua ions.- 4.6 Silver(I) complexes.- 4.7 Silver(II) complexes.- 4.8 Silver(III) complexes.- 4.9Gold(-I) complexes.- 4.10 GoId(I) complexes.- 4.11 Gold(II) complexes.- 4.12 Gold(III) complexes.- 4.13 Gold(IV) complexes.- 4.14 Gold(V) complexes.- 4.15 Organometallic compounds of silver.- 4.16 Organometallic compounds of gold.- 4.17 Gold cluster complexes.- 4.18 Relativistic effects in gold chemistry.- 4.19 Aurophilicity.- 4.20 Silver and gold compounds in medicine.- 4.21 Mössbauer spectroscopy of gold compounds.- References.