Photophysical property vs. medium: mononuclear, dinuclear and trinuclear Zn(ii) complexes

Abstract

Mononuclear, acetato bridged dinuclear and phenoxo bridged trinuclear Zn(ii) complexes have been synthesized. Their photophysical properties were characterized spectroscopically and with TDDFT and attributed to intra ligand (π → π*) charge transfer.

Mono- and Rare Trinuclear Zn(II) Complexes with Near-Infrared Emissive Ligands: Anion-Responsive Nuclearity Control, Interconversion, Solid-State NIR Emission, and Latent Fingerprint Imaging

“…18 Zn(II) is one such example, and there are only a few reports on Zn(II) complexes exhibiting multiple nuclearities prepared from a series of similar ligands. 4,8,9 A fingerprint is a unique identification feature of a human being, and it constitutes valuable evidence in crime scenes. However, in most cases, the fingerprints are latent to the naked eyes and require development techniques for visualization.…”

“…The ability to control the nuclearity of complexes derived from a series of similar ligands is important in developing metal–organic systems with predesigned properties. However, such nuclearity control is often difficult due to the involvement of multiple variables. − The common approaches employed for nuclearity control in metal complexes include changing the anions, reaction temperatures, reaction conditions, and additives. − Similarly, the development of strategies for the interconversion of metal complexes of different nuclearities is also vital as a synthetic approach. − Still, the predictable nuclearity control and the interconversion of metal complexes of different nuclearities remain challenging tasks to achieve. Further, the situation becomes more complicated if the metal ions do not show any crystal field stabilization energy for a particular geometry .…”

Crystal structure of tetrakis(μ2-(E)-2,4-dibromo-6-{[2-(pyridin-2-yl)ethyl]iminomethyl}phenolato)trizinc bis(perchlorate) acetonitrile disolvate

“…The coordination environment of the title compound, illustrated in Fig. 1, has been observed in zinc(II) complexes with tridentate N,N,O ligands (Hens & Rajak, 2015;Kim et al, 2015). Transition metal complexes of the related tridentate ligand, 1,3(2-pyridyliminomethyl)phenylenediamine, have been shown to form a variety of interesting complex structures (Kundu et al, 2015;Kumar et al, 2011;Bluhm et al, 2003;Souza et al, 2011;Sanyal et al, 2014;Okeke et al, 2017a,b;Okeke et al, 2018).…”

A pyridine based Schiff base as a selective and sensitive fluorescent probe for cadmium ions with “turn-on” fluorescence responses

“…This phenomenon suggested that Cd 2+ is quickly bound with PMPA. 46 The interesting revelations in the UV-visible spectral studies with various metal ions motivated us to further investigate detailed fluorescence spectroscopic studies. Addition of metal ions changed the emission spectrum of PMPA to different extents.…”