Versatile pentadentate 1,5-bis(salicylideneamino)pentan-3-ol type ligands yield novel tri- and tetra-manganese(II) complexes: structure and properties

Abstract

Fig. 3 View of four [Mn II 3 (L 3 ) 2 (m 2 -OAc)] 2 , Na + •H 2 O ion pairs 2 emphasizing the infinite p-stackings perpendicular to [001]. The intramolecular p-stacking distances are 3.4 and 3.5 Å. The two crystallographically independent intermolecular p-stacking distances are 3.3 and 3.4 Å.

Two Molecular-Type Complexes of the Octahedral Rhenium(III) Cyanocluster Anion [Re6Se8(CN)6]4− with M2+ (Mn2+, Ni2+)

“…The CN ligands are coordinated to rhenium atoms through the carbon atom. The bond lengths and angles in the anion (see Table 1) do not differ from those found in other salts with an Re 6 Se 8 cluster core [K 4 Re 6 Se 8 (CN) 6 ·3.5H 2 O: [2] ReϪRe ϭ 2.633 Å ; ReϪSe ϭ 2.526 Å ; ReϪC ϭ 2.11 Å ; CϪN ϭ 1.15 Å ; NaCs 3 Re 6 Se 8 (CN) 6 : [4] ReϪRe ϭ 2.634 Å ; ReϪSe ϭ 2.52 Å ; ReϪC ϭ 2.10 Å ; CϪN ϭ 1.17 Å ; Cs 4 Re 6 Se 8 I 6 : [5] ReϪRe ϭ 2.625; ReϪSe ϭ 2.519 Å ].…”

“…In the related compound [(nPr) 4 6 ]} fragment of 3 is shown in Figure 2c and some bond lengths and angles are presented in Table 2 for comparison. In contrast to compounds 1 and 2, the manganese(II) cation in 3 has a distorted octahedral coordination environment [1N ϩ 5O(H 2 O)] with an MnϪNϪC angle of 158(5)°The reason for such a deviation from linearity is the different arrangement of the ionic pairs in the solid state.…”

“…Stelzig et al [6] have reported the complexes [Mn II 2 L 3 (µ 3 -OMe)(MeOH)] 2 and Na[Mn II 3 (L 3 ) 2 (µ 2 -OAc)]·H 2 O·0.25THF, where L 3 ϭ 1,5-bis(3-Cl, 5-NO 2 -salicylideneamino)pentan-3-ol, a voluminous pentadentate ligand. The Mn 2ϩ coordination arrange- [7] To confirm the difference in the manganese environments in 2 and 3 we have recorded the MnK XANES (X-ray Absorption Near Edge Structure) spectra for these com- pounds ( Figure 4).…”

“…[1] Complex cluster anions [Re 6 (µ 3 -Se) 8 (CN) 6 ] 4Ϫ with terminal CN groups [2] can also interact with transition metals to form new polymeric cluster solids based onReϪCϵNϪMϪNϵCϪRe-bridges. [3,4] The type of polymeric compound formed and the coordination environment of the metal cation are influenced enormously by the nature of the additional cations present in the reaction mixture.…”

“…We have found that an increase of cation size in the series Cs ϩ Ͻ Me 4 N ϩ Ͻ Et 4 N ϩ Ͻ nPr 4 N ϩ results in a reduction of the dimensionality of the formed solids. In the case of Cs ϩ , [3a] Me 4 N ϩ and Et 4 N ϩ , [3b] a three-dimensional polymeric framework {M 3 [Re 6 Se 8 (CN) 6 ] 2 } 2Ϫ is formed which includes these cations and water molecules in its cavities. In the case of nPr 4 N ϩ , [3c] polymeric chains or molecular-type structures built from complex anions and M 2ϩ are obtained.…”