Synthesis of photoluminescent europium dithiocarbamate complexes with dimethyl phenanthroline and bipyridyl co-ligands

Preparation, characterisation and biological activity of some metal complexes derived from new dithiocarbamate of heterocyclic ligand

“…This band was shifted and appeared at 3300-3388 cm -1 , corresponding to the absence of the amine group alone (NH) in Figs. (3)(4)(5). The (NH) group includes the bands at 1583-1603.…”

“…The chemistry of dithiocarbamates has achieve more attention in last years, due to their variable ability of coordination modes and strong ability to coordination to many groups [1] and transition metal ions [2]. The dithiocarbamates derivatives had great attention due to their biological activity [3] such as antitumor [4], antibacterial [5], and antifungal [6]. The dithiocarbamates had application in supramolecular chemistry [7], and science of materials [8].…”

Effect of Pyrrolidinedithiocarbamate Ligand on the Luminescence Properties of Heteroligand Samarium and Europium Complexes: Experimental and Theoretical Study

“…16,17,20−24 They are successfully used in photochemistry, 17,21,22,25 as precursors of Ln sulfides 26,27 and demonstrate certain features, which are suitable for the development of novel electronic devices. 28 It has been reported that the combination of phen and dtc ligands results in better sensitization for Sm 3+ and Pr 3+ ions and the corresponding complexes exhibit more intense emission than those of the Eu 3+ , Tb 3+ , and Dy 3+ analogues. 17,20,23 The observed low luminescence intensity of Eu(S 2 CNR 2 ) 3 (phen) was surprisingly relying on the Dexter mechanism and taking into account that (1) T 1 state (concentrated mainly on phen) is a potential antenna for the excited energy transfer to Eu 3+23 similar to the highly luminescent Eu 3+ -phen complexes; 12,29 (2) the resonance between the excited T 1 (phen) state (21,740 cm −1 , 2.69 eV) 22 and the acceptor levels of Eu 3+ (17,277 cm −1 , 2.14 eV)/Sm 3+ (17,860 cm −1 , 2.21 eV) 30 are suitable (ΔE ∼0.5−0.6 eV) 31,32 for both ions unlike the higher energy acceptor levels of Dy 3+ (21,056 cm −1 , 2.61 eV) 30,33 and Tb 3+ (20,500 cm −1 , 2.54 eV); 30,33 (3) the heteroligand Eu 3+ and Sm 3+ complexes studied are isostructural.…”

“…Compared to the O-donor ligands, the S-donor chromophores increase the HOMO energy, decrease the HOMO–LUMO gap, and may lead to enhanced electronic communication between the sulfur donor ligand and lanthanide center . Due to their extensive range of applications, the resulting structures form a class of compounds, which has attracted significant attention in the last decades. , The necessary stability for practical application was achieved for the heteroligand Ln complexes, consisting of dtc anion and L = phen or 2,2′ -bipy (with general formula Ln­(S 2 CNR 2 ) 3 (L)). ,,− They are successfully used in photochemistry, ,,, as precursors of Ln sulfides , and demonstrate certain features, which are suitable for the development of novel electronic devices . It has been reported that the combination of phen and dtc ligands results in better sensitization for Sm 3+ and Pr 3+ ions and the corresponding complexes exhibit more intense emission than those of the Eu 3+ , Tb 3+ , and Dy 3+ analogues. ,, The observed low luminescence intensity of Eu­(S 2 CNR 2 ) 3 (phen) was surprisingly relying on the Dexter mechanism and taking into account that (1) T 1 state (concentrated mainly on phen ) is a potential antenna for the excited energy transfer to Eu 3+ similar to the highly luminescent Eu 3+ - phen complexes; , (2) the resonance between the excited T 1 ( phen ) state (21,740 cm –1 , 2.69 eV) and the acceptor levels of Eu 3+ (17,277 cm –1 , 2.14 eV)/Sm 3+ (17,860 cm –1 , 2.21 eV) are suitable (Δ E ∼0.5–0.6 eV) , for both ions unlike the higher energy acceptor levels of Dy 3+ (21,056 cm –1 , 2.61 eV) , and Tb 3+ (20,500 cm –1 , 2.54 eV); , (3) the heteroligand Eu 3+ and Sm 3+ complexes studied are isostructural.…”