Neutral Praseodymium(III) Complexes with Tetraselenidoantimonate Ligand: Coligand Influence of Mixed Polyamines on the Coordination Mode of [SbSe₄]3− Anion

摘要

Abstract Mix-coordinated praseodymium(III) complexes concerning the [SbSe₄]3− inorganic ligand, [Pr(en)₂(dien)(η 2-SbSe₄)] (1) and [Pr(en)(trien)(μ-η 1,η 2-SbSe₄)] _n (2) (en = ethylenediamine, dien = diethylenetriamine, trien = triethylenetetramine), were prepared by solvothermal reactions of Pr₂O₃, Sb and Se in en + dien and en + trien mixed solvents, respectively. They crystallize in the monoclinic space group P2₁ but with different molecular structures. Crystallographic data for 1: a = 8.610(2), b = 27.722(7), c = 9.294(2) Å, β = 108.987(3)°, V = 2097.7(9) Å3, Z = 4. For 2: a = 14.2987(17), b = 9.0176(9), c = 15.4357(18) Å, β = 100.708(3)°, V = 1955.6(4) Å3, Z = 4. The [SbSe₄]3− anion coordinates to the Pr3+ ion in [Pr(en)₂(dien)]3+ as a η 2-SbSe₄ chelating ligand, yielding complex 1. It acts as a μ-η 1,η 2-SbSe₄ bridging ligand to connect the [Pr(en)(trien)]3+ ions into the polymer 2. The coordination difference between 1 and 2 is attributed to the coligands of mixed polyamines.