New Near-Infrared Spectrophotometry for d8 Metal Ions, NiII and PtII, with 2,2-Dithiobis(1-aminonaphthalene) in Aqueous Micellar Solutions

1-Amino-2-naphthalenethiolate ion (C10H6NH2S-), produced from 2,2ʹ-dithiobis(1-aminonaphthalene) (DTAN), forms 1:2 chelates with d8 metal ions (NiII and PtII) in aqueous PONPE 20 micellar solutions, and then subsequent oxidation of the chelates with O2 yield new NIR-absorbing chelates [MII(C10H6NHS·)2]0. The remarkable NIR absorption properties are as follows: for PtII (794 nm) e = 5.03 × 10^4 M^-1 cm^-1; for NiII (884 nm) (epsilon) = 4.73 × 104 M^-1 cm^-1.