Recent advances in luminescent heavy metal complexes for sensing

Synthesis of Novel Pyridyl-Based Schiff Base and Its Coordination Behaviour with Ruthenium(II) and Zinc(II)

“…Transition metal complexes with Schiff bases have been of significant interest due to their antibacterial and antifungal activities [3][4][5]. Schiff base complexes can be tailored and designed as materials in many applications such as molecular sensing [6,7], optical switching [8], non-linear optics and photo-initiated processes [9]. Schiff bases are accessible by refluxing primary amines and aldehyde to form the carbinolamine moiety which undergoes a dehydration reaction to form the Schiff base.…”

Homo‐ and Heteroleptic Phototoxic Dinuclear Metallo‐Intercalators Based on RuII(dppn) Intercalating Moieties: Synthesis, Optical, and Biological Studies

“…Excitation of all three complexes using a 7 ps laser pulse at 355 nm, measured over a time window of 3.5 nanoseconds, leads to the formation of several transient bands due to ground state bleaching Ð Fig 2. The transient spectra for the three complexes are unmatched, implying that the excited state accessed on the picosecond time scale is not the same in each case. As expected, the observed transient spectrum of complex 4 4+ (Fig 2A) and mononuclear analogue (see SI), shows a broad absorption at ̴ 600 nm, indicating occupation of the Ru→dppz-based 3 MLCT state. However, the transient absorption spectrum of complex 2 4+ (Fig 2B) differs significantly from that of 4 2+ and is consistent with an expected dppn-based 3 ππ*state, which displays an absorption at ̴ 540 nm; [29] comparable to its mononuclear analogue 1…”

“…The structured 3 ππ* absorption grows in at 540 nm accompanied by the broad 3 MLCT absorption around ̴ 600 nm, indicating that Ð at least on this timescale Ð both excited states are occupied. The normalised excited states at 100 ps for all complexes is shown in panel D for comparison -2 and 3 are shown at 100 ps, the spectrum for 4 has been summed between 30-200 ps to improve signal-tonoise, as no spectral changes are observe during this timescale.…”

“…[1][2][3][4][5] In this context, the photophysics and biomolecular recognition properties of polypyridyl complexes containing the Ru II dppz unit have attracted particular attention, as many of the complexes display a ÒDNA light-switchÓ effect, in which Ru→dppz-based 3 MLCT emission is Òswitched onÓ through DNA intercalation. [6][7][8][9] Although the parent complex,…”

Principles of chemosensory system organization for detecting metal ions in aqueous solutions

“…Существующая в настоящее время флуоресцентная методика определения концентрации химических веществ в водном растворе основана на измерении изменения интенсивности или спектра люминесценции чувствительного по-крытия в присутствии определяемого вещества (аналита) [11][12][13][14]. Так, в случае люмокупферона в присутствии ионов меди происходит образование хорошо люминесцирующего фотодимера из слабо люминесцирующей формы реактива.…”