31P NMR coordination shifts in transition metal complexes with heterocycles containing phosphorus—Update for 2012–20

An update of a review paper published in 2013 (L. Pazderski, 15N and 31P NMR coordination shifts in transition metal complexes with nitrogen- and phosphorus-containing heterocycles, Annu. Rep. NMR Spectr. 2013, 80, 33–180), devoted to 31P NMR and covering years 2012–20 (till June), with 90 references. It collects 31P NMR data for 108 complexes of such transition metal ions as Ni(II), Pd(II), Pt(II), Pt(IV), Rh(I), Ir(I), Co(III), Rh(III), Ir(III), Fe(II), Ru(II), Os(II), Cu(I), Ag(I), Au(I), Au(III), Zn(II), Cd(II) and Hg(II) with phosphorus-containing heterocycles (phosphinines and phospholes). 31P NMR coordination shifts, i.e., differences between 31P chemical shifts of the same phosphorus in the molecules of the complex and the ligand (Δ31Pcoord = δ31Pcompl—δ31Plig) are discussed in relation to some structural features of the reviewed coordination compounds, mainly to the type of the metal central ion and the donor atom in trans position in respect to the concerned P atom.