Synthesis and characterization of zinc di(O-2,2-dimethylpentan-3-yl dithiocarbonates) bearing pyridine or tetramethylethylenediamine coligands and investigation of their thermal conversion mechanisms towards nanocrystalline zinc sulfide

Abstract

Different coligands on zinc xanthate complexes significantly influence the thermal decomposition mechanism in the conversion process towards nanocrystalline zinc sulfide.

Metal Sulfide Thin Films with Tunable Nanoporosity for Photocatalytic Applications

“…Zinc xanthates with alkyl ligands comprising 2, 5, 6, and 12 carbon atoms have been synthesized as outlined in Figure a and in the Experimental Section according to previous studies. ,, Due to the low solubility of these compounds in common organic solvents, such as chloroform and toluene, they have been modified with pyridine ligands, which leads to a significant increase of their solubility. In the following text, the zinc xanthate complexes and the ZnS films prepared with these precursors will be referred to as C- x ( x = 2, 5, 6, and 12, depending on the number of carbon atoms in the linear aliphatic alkyl chain).…”

“…Commonly, their thermal decomposition proceeds via a mechanism known as Chugaev elimination, which leads to the formation of COS (carbonyl sulfide) and the corresponding alkene . Very recently, we found that a second mechanism, in which the xanthate is protonated and leads to the formation of CS 2 and the corresponding alcohol, occurs simultaneously with the Chugaev elimination . Even though thermal decomposition is the most conventional method, metal xanthates can also be decomposed chemically , or photochemically, with primary amines or UV irradiation, respectively.…”

“…Even though thermal decomposition is the most conventional method, metal xanthates can also be decomposed chemically , or photochemically, with primary amines or UV irradiation, respectively. There are many studies where metal xanthates are used for the formation of nanocrystalline metal sulfides, either as powders ,, or thin films on substrates. − In these approaches, metal xanthates are initially dissolved in an appropriate solvent forming a clear solution and are subsequently deposited on substrates via several possible methods such as spin-coating, , doctor blading, or chemical vapor deposition. − The next step is their decomposition and conversion to metal sulfides. The prepared metal sulfides can be further used in applications, such as solar cells, , curing agents for epoxy resins, and supercapacitors or catalysts for water splitting. , …”

Honeycomb-structured copper indium sulfide thin films obtainedviaa nanosphere colloidal lithography method

“…The high intensity peak at 2968 cm À1 correspond to the C-H asymmetric stretching vibration, while the peaks at 1240 and 1214 cm À1 and at 1056 and at 1036 cm À1 correspond to asymmetric C-O-C, C-S and C-H stretching vibrations of the xanthates, respectively. 38 Regarding the polystyrene, lower intensity vibrations, which stem from an aromatic C-H stretching vibration, can be observed at 3025 cm À1 . The bands at 1601, 1493 and 1452 cm À1 correspond to aromatic CQC stretching vibrations and the ones at 757 and 697 cm À1 to C-H out-of-plane bending vibrations.…”

Silica-based fibers with axially aligned mesopores from chitin self-assembly and sol-gel chemistry

“…Last, we have started a preliminary study on hybrid fibers containing zinc xanthate precursors in view of the in situ formation of ZnS nanoparticles. Zinc xanthates are known to decompose under mild temperatures to yield metal sulfide nanocrystalline materials [94]. The synthesis protocol has been modified so as to spin homogeneous suspensions containing chitin nanorods, siloxane oligomers, zinc xanthate (in variable proportions relative to Si) and PVP (see Experimental section).…”