Most compounds of gold (Au) bound to a porphyrin recorded in the CCDC database are red, followed by orange and brown, as shown in the table:
SHORT IDENTIFIER COLOR FORMULA CHEMICAL NAME REFERENCE URL JOURNAL AUTHORS
GAFTAI Red C8 N4 Pt1 S4 2-,2(C44 H28 Au1 N4 1+) bis(Dithiomaleonitrilo-S,S')-platinum(ii) bis(tetraphenylporphyrinato-gold(iii)) Not informed Mem.Fac.Sci.Kyushu U.,Ser.C Zhung Jin Zhong; Y.Nishida; H.Okawa; S.Kida
GUTVAT Red C68 H44 Au1 N4 1+,Cl1 1-,C3 H7 N1 O1 (5,10,15,20-tetrakis(Biphenyl-4-yl)porphyrinato)-gold(iii) chloride dimethylformamide solvate http://dx.doi.org/10.1002/chem.200902741 Chem.-Eur.J. R.W.-Y.Sun; C.K.-L.Li; Dik-Lung Ma; J.J.Yan; Chun-Nam Lok; Chung-Hang Leung; Nianyong Zhu; Chi-Ming Che
GUTVEX Red C44 H24 Au1 F4 N4 1+,Au1 Cl2 1- (5,10,15,20-tetrakis(4-Fluorophenyl)porphyrinato)-gold(iii) dichloro-gold(i) http://dx.doi.org/10.1002/chem.200902741 Chem.-Eur.J. R.W.-Y.Sun; C.K.-L.Li; Dik-Lung Ma; J.J.Yan; Chun-Nam Lok; <PERSON>; Nianyong Zhu; Chi-Ming Che
KOLWOA Red C38 H9 Au1 F15 N4 1+,Cl1 1-,C1 H2 Cl2 (5,10,15-tris(pentafluorophenyl)porphyrinato)-gold(iii) chloride dichloromethane solvate http://dx.doi.org/10.1002/asia.201900422 Chem.Asian J. 268
H.Tanaka; Y.Haketa; N.Yasuda; H.Maeda
KOLWUG Red C44 H8 Au1 F20 N4 1+,4(C1 H1 Cl3),Cl1 1- [5,10,15,20-tetrakis(pentafluorophenyl)porphyrinato]-gold(iii) chloride chloroform solvate http://dx.doi.org/10.1002/asia.201900422 Chem.Asian J. H.Tanaka; Y.Haketa; N.Yasuda; H.Maeda
KOLXAN Red C44 H8 Au1 F20 N4 1+,0.61(C2 H4 Cl2),B1 F4 1- [5,10,15,20-tetrakis(pentafluorophenyl)porphyrinato]-gold(iii) tetrafluoroborate 1,2-dichloroethane solvate http://dx.doi.org/10.1002/asia.201900422 Chem.Asian J. H.Tanaka; Y.Haketa; N.Yasuda; H.Maeda
KOLXER Red C32 H10 Au1 F10 N4 1+,0.5(C2 H4 Cl2),F6 P1 1- [5,15-bis(pentafluorophenyl)porphyrinato]-gold(iii) hexafluorophosphate 1,2-dichloroethane solvate http://dx.doi.org/10.1002/asia.201900422 Chem.Asian J. H.Tanaka; Y.Haketa; N.Yasuda; H.Maeda
KOLXIV Red C38 H9 Au1 F15 N4 1+,F6 P1 1-,1.46(C1 H2 Cl2) [5,10,15-tris(pentafluorophenyl)porphyrinato]-gold(iii) hexafluorophosphate dichloromethane solvate http://dx.doi.org/10.1002/asia. 268