Journal Article

PUBDB-2024-01634

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tetramerization of BEB-Doped Phenalenyls to Obtain (BE)$_8$-[16]Annulenes (E = N, O)

Scholz, A. S. ; Bolte, M. ; Virovets, A.Extern* ; Peresypkina, E.Extern* ; Lerner, H.-W. ; Anstöter, C. S. (Corresponding author) ; Wagner, M. (Corresponding author)Extern*

2024
ACS Publications Washington, DC

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Please use a persistent id in citations: doi:10.1021/jacs.4c02163

Abstract: Two (BE)8-[16] annulenes were prepared and fully characterized by experimental and quantum-chemical means (1,E =N;2, E=O). The 1,8-naphthalenediyl-bridged diborane(6)3 served as their common starting material, which was treated with [Al(NH$_3$)$_6$]Cl$_3$ to form 1 (91%yield) or with 1,8-naphthalenediboronic acid anhydride to form 2 (93%yield). As a result, the heteroannulenes 1 and 2 are supported by four aromatic “clamps” and may also be viewed as NH-or O-bridged cyclic tetramers of BNB-or BOB-doped phenalenyls. X-ray crystallography on mono-, di-, and tetra adducts 2*thf, 2*py$_2$, and 2*py$_4$ showed that 2 is an oligotopic Lewis acid (thf/py: tetrahydrofuran/pyridine donor). The applicability of 2 also as a Lewis basic ligand in coordination chemistry was demonstrated by the synthesis of the mononuclear Ag$^+$ complex [Ag(py)$_2$(2*py$_4$)]$^+$ and the dinuclear Pb$^{2+}$ complex 6. During the assembly of 6, the rearrangement of 2 led to the formation of two (BO)$_9$-macrocycles linked by two BOB-phenalenyls to form a nanom$eter-sized cage with four negatively charged, tetracoordinated B atoms. Both 1 and 2 show several redox waves in the cathodic regions of the cyclicvoltammograms. An in depth assessment of the consequences of electron injection on the aromaticity of 1 and 2was achieved by electronic structure calculations. 1 and 2 are proposed to exhibit aromatic switching capabilities in the [16]annulene motif.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20220822 (I-20220822) (I-20220822)

Experiment(s):

1. PETRA Beamline P24 (PETRA III)

Appears in the scientific report 2024

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