NoteA comparison between the structures of [MnIII(bbpen)][PF6] and [MnIII(bbppn)][PF6] (H2bbpen=N,N′-bis(2-hydroxybenzyl)-N,N′-(2-pyridylmethyl)ethylenediamine, H2bbppn=N,N′-bis(2-hydroxybenzyl)-N,N′-(2-pyridylmethyl)-1,3-propanediamine)1

Add time:09/24/2019    Source:sciencedirect.com

The reaction of Mn(OAc)·2H2O in methanolic solution with N,N′-bis(2-hydroxybenzyl)-N,N′-(2-pyridylmethyl)-1,3-propanediamine (H2bbppn; C29H32N4O2) affords upon addition of NH4PF6 green crystals of the monomeric [MnIII(bbppn)][PF6] (2) complex. The crystal structure of 2 has been determined by X-ray crystallography. Crystal data: monoclinic P21/n (No. 14), a=12.762(1), b=12.543(2), c=19.008(2) Å, β=93.18(2)°, V=3038(1) Å3, Z=4. The structure has been refined to an R factor of 6.5% based on 2322 observed reflections. The arrangement of bbppn2− around the MnIII center in 2 is compared to the close related [MnIII(bbpen)][PF6] (1) complex (H2bbpen=N,N′-bis(2-hydroxybenzyl)-N,N′-(2-pyridylmethyl)ethylenediamine). The fundamental geometric difference between the two structures lies in the isomeric nature of the coordination of the N4O2-donor set, which results in quite different bond distances around the metal centers.

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