One-Dimensional Vanadium(III) Chalcogenidostannates Incorporating [V(tepa)]³⁺ Complexes as Bridging Groups

Abstract

Two new one-dimensional (1D) vanadium­(III) chalcogenidostannates, [H2tepa]0.5n [VIII(tepa)­(μ-Sn2Q6)] n [Q = S (1), Se (2); tepa = tetraethylenepentamine], were achieved by solvothermal methods, which offer the first examples of organic hybrid polymeric chalcogenidostannates incorporating [V­(tepa)]3+ complexes as bridging groups. Both 1 and 2 feature the 1D sinusoidal chains of [VIII(tepa)­(μ-Sn2Q6)] n containing two types of novel bridging modes of the [μ-Sn2Q6]4– anion. Their magnetic, photocurrent response, and optical properties are also studied.

Magnetic anisotropy of transition metal and lanthanide ions in pentagonal bipyramidal geometry

“…17 Magnetic behavior, high-field EPR investigations, and theoretical studies concluded to the absence of first-order spin-orbit coupling due to degeneracy lifting of the two lower energy levels, and converged on anisotropy parameters D in the range of 3.9-4.5 cm À1 , and negligibly small E. For two complexes, [V III (tepa)(m-Sn 2 Q 6 )] n (tepa stands for tetraethylenepentamine, Q = S or Se), featuring an open N5pentadentate ligand and either S or Se atoms in the apical positions, magnetic behavior has been reported but no information on magnetic anisotropy has been provided. 18 Significantly larger ZFS effects have been found for second and third row metal ions. A 4d complex with Mo IV , [Mo(L1 Ph )Cl 2 ], was found to undergo a rapid decrease of its magnetic moment below 50 K attributed to thermal depopulations of the excited M S = AE1 levels resulting from ZFS of the S = 1 triplet state.…”

“…For two complexes, [V III (tepa)(μ-Sn 2 Q 6 )] n (tepa stands for tetraethylenepentamine, Q = S or Se), featuring an open N5-pentadentate ligand and either S or Se atoms in the apical positions, magnetic behavior has been reported but no information on magnetic anisotropy has been provided. 18…”

Vanadium O-Centered Selenoiodide Complex: Synthesis and Structure of V4O(Se2)4I6·I2

“…The coordination environment of vanadium atoms (2I + O + 4Se) represents a distorted pentagonal bipyramid (Figure c). For vanadium cations, coordination number 7 may be found both for mononuclear vanadium complexes and a binuclear complex …”