The X-ray crystal structure analysis of [AuCl-(terpy)](BF 4 ) 2 and [AuCl(terpy)](SO 3 CF 3 ) 2 show with the counter anions BF 4 -and SO 3 CF 3 -an expanded, more or less distorted octahedral coordination geometry. These secondary bonding interactions of the counter anions with the square planar complex cation [AuCl(terpy)] 2? are discussed and compared with those found in related gold(III) terpyridine complexes. In [AuCl(terpy)](SO 3 CF 3 ) 2 a very short non-bonding Au-O distance of 2.7641(4)Å of one of the triflate ions was found. The tetrafluoroborate complex is monoclinic with space group P2 1 / c and cell parameters a = 8.7587 (12)Å , b = 13.2623(19)Å , c = 15.537(2)Å , b = 90.362(2)°, V = 1804.7(4)Å 3 , Z = 4. The triflate complex is triclinic with space group P " 1 and cell parameters a = 7.4198(15)Å , b = 12.069(2)Å , c = 13.583(3)Å , a = 101.414(3)°, b = 101.922(3)°, c = 94.838(4)°, V = 1156.6(4)Å 3 , Z = 2.
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