“…The Au−P distance (248 pm) is, however, appreciably longer than those found in linear gold(I) complexes of various substituted monodentate λ 3 ‐phosphinine ligands: ClAu(PC 5 H 2 t Bu 3 ‐2,4,6) (221.9(2) pm), ClAu(PC 5 H 2 Ph 2 ‐2,6‐Me−4) (av 220.62(7) pm), ClAu(PC 5 H 2 R 2 ‐2,6‐Ph‐4) (223.4(3) pm for R=Me; ca. 222 pm for R=Ph), ClAu(PC 5 H 2 R‐2‐Ph 2 ‐4,6) (av 220.8(1) pm; R=C 6 H 3 (OMe) 2 ‐3,4), ClAu{PC 5 HR‐2‐Me‐3‐Ph 2 ‐4,6} (220.40(7) pm; R=C 6 H 3 Me 2 ‐2,3), ClAu{PC 5 H 3 (SiMe 3 ) 2 ‐2,6} (221.1(2) pm), and [Au{PC 5 H 3 (SiMe 2 R) 2 ‐2,6} 2 ][GaCl 4 ] (av 228.2(4) pm for R=Me; av 226.3(2) pm for R=CCPh) . The most salient difference to the homologous py complex 4 is the relative disposition of the heteroaromatic EC 5 H 5 ring with respect to the metal coordination plane; the dihedral angle is much smaller for E=P (20.3°) than for E=N (81.2°).…”