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Recent development in the synthesis and characterization of noble-gas compounds is reviewed, i.e., noble-gas chemistry reported in the last five years with emphasis on the publications issued after 2017. XeF 2 is commercially available and has a wider practical application both in the laboratory use and in the industry. As a ligand it can coordinate to metal centers resulting in [M(XeF 2 ) x ] n+ salts. With strong Lewis acids, XeF 2 acts as a fluoride ion donor forming [XeF] + or [Xe 2 F 3 ] + salts. Latest examples are [Xe 2 F 3 ][RuF 6 ]·XeF 2 , [Xe 2 F 3 ][RuF 6 ] and [Xe 2 F 3 ][IrF 6 ]. Adducts NgF 2 ·CrOF 4 and NgF 2 ·2CrOF 4 (Ng = Xe, Kr) were synthesized and structurally characterized at low temperatures. The geometry of XeF 6 was studied in solid argon and neon matrices. Xenon hexafluoride is a well-known fluoride ion donor forming various [XeF 5 ] + and [Xe 2 F 11 ] + salts. A large number of crystal structures of previously known or new [XeF 5 ] + and [Xe 2 F 11 ] + salts were reported, i.e., [Xe 2 F 11 ][SbF 6 ], [XeF 5 ][SbF 6 ], [XeF 5 ][Sb 2 F 11 ], [XeF 5 ][BF 4 ], [XeF 5 ][TiF 5 ], [XeF 5 ] 5 [Ti 10 F 45 ], [XeF 5 ][Ti 3 F 13 ], [XeF 5 ] 2 [MnF 6 ], [XeF 5 ][MnF 5 ], [XeF 5 ] 4 [Mn 8 F 36 ], [Xe 2 F 11 ] 2 [SnF 6 ], [Xe 2 F 11 ] 2 [PbF 6 ], [XeF 5 ] 4 [Sn 5 F 24 ], [XeF 5 ][Xe 2 F 11 ][Cr V OF 5 ]·2Cr VI OF 4 , [XeF 5 ] 2 [Cr IV F 6 ]·2Cr VI OF 4 , [Xe 2 F 11 ] 2 [Cr IV F 6 ], [XeF 5 ] 2 [Cr V  2 O 2 F 8 ], [XeF 5 ] 2 [Cr V  2 O 2 F 8 ]·2HF, [XeF 5 ] 2 [Cr V  2 O 2 F 8 ]·2XeOF 4 , A[XeF 5 ][SbF 6 ] 2 (A = Rb, Cs), Cs[XeF 5 ][Bi x Sb 1-x F 6 ] 2 (x = ~0.37-0.39), NO 2 XeF 5 (SbF 6 ) 2 , XeF 5 M(SbF 6 ) 3 (M = Ni, Mg, Zn, Co, Cu, Mn and Pd) and (XeF 5 ) 3 [Hg(HF)] 2 (SbF 6 ) 7 . Despite its extreme sensitivity, many new XeO 3 adducts were synthesized, i.e., the 15-crown adduct of XeO 3 , adducts of XeO 3 with triphenylphosphine oxide, dimethylsulfoxide and pyridine-N-oxide, and adducts between XeO 3 and N-bases (pyridine and 4-dimethylaminopyridine). [Hg(KrF 2 ) 8 ][AsF 6 ] 2 ·2HF is a new example of a compound in which KrF 2 serves as a ligand. Numerous new charged species of noble gases were reported (ArCH 2  + , ArOH + , [ArB 3 O 4 ] + , [ArB 3 O 5 ] + , [ArB 4 O 6 ] + , [ArB 5 O 7 ] + , [B 12 (CN) 11 Ne] - ). Molecular ion HeH + was finally detected in interstellar space. The discoveries of Na 2 He and ArNi at high pressure were reported. Bonding motifs in noble-gas compounds are briefly commented on in the last paragraph of this review.

Noble-Gas Chemistry More than Half a Century after the First Report of the Noble-Gas Compound