Recent Advances in Thiourea Based Colorimetric and Fluorescent Chemosensors for Detection of Anions and Neutral Analytes: A Review

Thiourea-Based Receptors for Anion Recognition and Signaling

“…This colorimetric response, like the one described above, has been widely reported in the literature for receptors analogous to those reported in this study and is, therefore, a common strategy for fluoride signaling. 22,44 It is important to note that the UV−vis response of MT1N in the presence of the other anions was considerably different from that observed with fluoride (see Figures S12−S16), as the charge-transfer band related to deprotonation was not observed in these systems. In the case of titrations involving the MT4N receptor, its spectral behavior in the presence of the anions Cl − , NO 3 − , and HSO 4 − was also markedly different from that observed with fluoride (see Figures 3 and S17−S19).…”

“…During the last decades, anion recognition has been a very important area of supramolecular chemistry that is currently growing. , In part, this is because the chemistry involved in this field has diverse applications in different topics such as catalysis, , medicine, − and materials science, among others. − Likewise, anions play a significant role in various environmental processes. ,− Therefore, the design of selective and sensitive receptors is a very important issue as well as the implementation of real-time monitoring methods for these species. However, the recognition of anions remains a challenge due to the intrinsic characteristics of these species, such as geometry, small charge density, high solvation energies, and possible pH dependence, among others. , In this context, in recent decades various approaches to anion recognition and signaling have been addressed, the most common involving hydrogen bond donor groups as receptor units, such as amides, , ureas, , thioureas, , squaramides, − and some combinations of the previous ones, , among others. This approach is based on taking advantage of the directionality and additivity that hydrogen bonding (HB) can confer.…”

Probing the Reactions of Thiourea (CH4N2S) with Metals (X = Au, Hf, Hg, Ir, Os, W, Pt, and Re) Anchored on Fullerene Surfaces (C59X)

“…The secondorder perturbation energy is evaluated using the mathematical representation given in eq 2 49 In eq 2, q represents the donor occupancy, E i and E j represent the diagonal elements, and F(i,j) represent the element in the Fock matrix. The second-order perturbation energy (E (2) ) of the donor and acceptor interacting NBOs within the studied complexes is depicted in Table 4. The analysis in this present study is characterized by the secondorder perturbation energies corresponding to the contributions from each excited-type transition from the donor (i) to the acceptor (j).…”

“…Exposure to this poisonous substance can bring about various health consequences. 2 It can be taken into the body system through inhalation of its aerosol, and ingestion when in solid state can lead to poisoning of the body system, as a consequence causing damages to the human cells. 3 On exposure repeatedly for a longer period of time, it causes skin irritations and a whole lot of thyroid problems, 4 which has the potency of causing death.…”

“…Due to its poisonous characteristics, it is a contributor to pollution, thereby causing sustainability issue to the environment. Exposure to this poisonous substance can bring about various health consequences . It can be taken into the body system through inhalation of its aerosol, and ingestion when in solid state can lead to poisoning of the body system, as a consequence causing damages to the human cells .…”