A NEW Cu(I) IODIDE COMPLEX SHOWING DEEP-RED LUMINESCENCE
- PDF / 394,124 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 46 Downloads / 173 Views
A NEW Cu(I) IODIDE COMPLEX SHOWING DEEP-RED LUMINESCENCE A. V. Artem′ev1,2*, M. I. Rakhmanova1,2, K. A. Brylev1,2, and I. Yu. Bagryanskaya2,3
A reaction of a [1,4-C6H4(CH2PPy3)2]Cl2 cationic ligand with CuI (MeCN, r.t.) produces an ionic [C6H4(CH2PPy3)2][C6H4(CH2PPy3Cu3I5)2] complex containing structurally unprecedented [Cu3I5]2– inorganic module in the anionic part. The title complex in the solid manifests a weak deep-red luminescence with λmax = 680 nm and lifetimes of 14 μs and 17 μs at 300 K and 77 K, respectively. DOI: 10.1134/S0022476620070082 Keywords: iodocuprates, pyridylphosphonium salts, Cu(I) complexes, photoluminescence, crystal structure.
INTRODUCTION Over the past decade, copper(I) halide complexes have gained considerable attention owing to their intriguing luminescent properties, giant structural diversity, and facile synthesis [1-4]. One of the major groups of these compounds are neutral complexes [CuxIyLz], whose CuxIy unit is supported by diverse N-, P-, S- or Se-donor ligands through Cu–L coordination bonds [1]. Another principal family of the Cu(I) halide complexes is presented by so-called halocuprates bearing a [CuxIx+y]y− anion charge-balanced by a non-bonded organic cation [5, 6]. Considering luminescent characteristics, the neutral complexes commonly demonstrate a strong emission [1-4], while halocuprates are much less efficient in this regard [1, 6]. Meanwhile, a low thermal stability and a high lability in solution are inherent to neutral [CuxIyLz] complexes, hindering the fabrication of emissive films via vapor deposition or solution processability. Recently, a third class of the copper(I) halide-based complexes has been disclosed, representing zwitterionic structures in which halocuprate [CuxIx+y]y− anions are coordinated with positively charged species bearing N- or S-donor atoms [7-9]. Generally, these zwitterionic compounds are assembled by reacting CuI with cationic ligands containing free donor atoms, e.g. N-monoalkylated DABCO halides or alkyltris(2-pyridyl)phosphonium salts. These zwitterionic complexes often exhibit a high photoluminescence performance coupled with the enhanced photo/thermal stability and solution processability, making them promising emitters for OLED application [7, 8]. Previously, we have reported that alkyl-tris(pyridyl)phosphonium halides [R-PPy3]Hal (R = Pr, Bu or Bn; Hal = Cl or I) upon contact with CuI yield zwitterionic [Cu4I6(R-PPy3)2] complexes, whose [R-PPy3]+ moieties are coordinated to the [Cu4I6]2– module [9]. Herein, aiming to extend this series, the interaction of CuI with bis[tri(pyridyl)phosphonium] salts has
1
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia; *[email protected]. 2Novosibirsk State University, Novosibirsk, Russia. 3Vorozhtsov Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia. Original article submitted December 26, 2019; revised January 17, 2020; accepted January 23, 2020. 1068
0022-4766/20/6107-1068 © 2020 by P
Data Loading...
