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The high spin Fe(iii) complex Fe(RhoCat)3 is reported as a smart dual-modal T1 MRI-optical imaging probe to visualize the NO molecule and an acidic pH environment.

A simple copper(II) complex of the anthracenylappended terpyridine ligand 4′-(anthracen-9-yl)-2,2′:6′,2′′-terpyridine (L), [Cu(L)Cl 2 ] (1, ESI-MS, m/z = 507.08), is reported as a highly selective "turn-on" optical imaging probe for L-cysteine. Probe 1 shows a Cu II /Cu I redox potential [E 1/2 = -0.194 V versus normal hydrogen electrode (NHE)] within a biologically viable range. The copper center in 1 adopts a square-pyramidal geometry (τ = 0.0851), and the Cu-N py bond (1.970 Å) of the middle pyridine (py) ring is shorter than the other two Cu-N py bonds (2.069 and 2.040 Å). The Cu-Cl bonds (2.444 and 2.027 Å) are labile enough to be replaced by solvent molecules. The squarebased geometry is further supported by the A s value of 156.8 × 10 -4 cm -1 determined by electron paramagnetic resonance (EPR) spectroscopy at 70 K. The d-d transition of 1 in [a]