Copper(i) 2-pyridyl selenolates and tellurolates: Synthesis, structures and their utility as molecular precursors for the preparation of copper chalcogenide nanocrystals and thin films

Abstract

The complexes, [Cu{EC(5)H(3)(R-3)N}](4) (E/R = Se/Me or Te/R; R = H or Me) were isolated by the reaction between CuCl and NaEC(5)H(3)(R-3)N and were characterized by elemental analyses, uv-vis and NMR ((1)H, (13)C) spectroscopy. The crystal structures of [Cu{SeC(5)H(3)(Me-3)N}](4) and [Cu(TeC(5)H(4)N)](4) revealed that the molecules are tetrameric in which each copper atom lies at the vertex of the tetrahedron and each face of the tetrahedron is capped by the bridging pyridylchalcogenolate ligand. Thermal behavior of these complexes was studied by thermogravimetric analysis. Depending on reaction conditions, thermolysis gave both stoichiometric and non-stoichiometric copper chalcogenides, which were characterized by XRD, EDX, SEM, TEM and SAED techniques. These precursors were used for the preparation of nanocrystals and for deposition of thin films of copper chalcogenides by AACVD (Aerosol Assisted Chemical Vapor Deposition).

Versatility of Bis(2‐pyridyl)ditellane

“…The crystal structure of [Cu(TeC 5 H 4 N)] 4 revealed that the molecules are tetrameric — each copper atom lies at the vertex of the tetrahedron and each face of the tetrahedron is capped by the bridging pyridylchalcogenolate ligand. This suggests that 8 is the possible intermediate of [Cu(TeC 5 H 4 N)] 4 …”

Syntheses of Pd(ii)/Pt(ii) complexes with non-chelating 4-pyridylselenolate ligand ranging from mononuclear to macrocyclic structures and their utility as catalysts in Suzuki C–C coupling reaction

“…Metal complexes based on ligands containing chalcogen atom and nitrogen donor, in particular, have not only been used as catalysts in C-C coupling reactions, 7-10 but have also emerged as versatile molecular precursors for metal chalcogenide nanomaterials. [11][12][13] Recently we have examined the chemistry of palladium and platinum complexes derived from two different classes of hemilabile ligands, viz. N,N-dimethylaminoalkylchalcogenolate [14][15][16][17][18][19] and 2-pyridylchalcogenolate.…”

Hemilabile silver(i) complexes containing pyridyl chalcogenolate (S, Se) ligands and their utility as molecular precursors for silver chalcogenides

“…6 N-heterocyclic thiolate complexes of coinage metals are fairly well investigated; 6,7 however, the heavier chalcogenolate (Se or Te) complexes have received attention only recently. 8 The hexanuclear ijAg{SeC 4 HIJMe-4,6) 2 N 2 }] 6 has been successfully employed as a molecular precursor for the synthesis of monodispersed Ag 2 Se nanoparticles. 8 Of late solution phase pyrolytic methods have emerged as a successful strategy to prepare metal chalcogenide nanomaterials.…”

“…8 The hexanuclear ijAg{SeC 4 HIJMe-4,6) 2 N 2 }] 6 has been successfully employed as a molecular precursor for the synthesis of monodispersed Ag 2 Se nanoparticles. 8 Of late solution phase pyrolytic methods have emerged as a successful strategy to prepare metal chalcogenide nanomaterials. 8,9 The homoleptic silver chalcogenolate complexes are polymeric and are insoluble in common organic solvents, thus limiting their utility as precursors for the preparation of silver-chalcogenides.…”

“…8 Of late solution phase pyrolytic methods have emerged as a successful strategy to prepare metal chalcogenide nanomaterials. 8,9 The homoleptic silver chalcogenolate complexes are polymeric and are insoluble in common organic solvents, thus limiting their utility as precursors for the preparation of silver-chalcogenides.…”