Slight ligand modifications within multitopic linear hydroxamates promotes connectivity differences in Cu() 1-D coordination polymers
The novel multitopic ligands N -hydroxy-4-((2-hydroxy-3-methoxybenzyl)amino)benzamide (L 3 H 3 ) and N -hydroxy-4-((2-hydroxybenzyl)amino)benzamide (L 4 H 3 ) have been synthesised through the Schiff base coupling and subsequent reduction of 4-aminophenylhydroxamic acid and either o -vanillin (to gi...
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Veröffentlicht in: | CrystEngComm 2021-08, Vol.23 (32), p.5531-5539 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The novel multitopic ligands
N
-hydroxy-4-((2-hydroxy-3-methoxybenzyl)amino)benzamide (L
3
H
3
) and
N
-hydroxy-4-((2-hydroxybenzyl)amino)benzamide (L
4
H
3
) have been synthesised through the Schiff base coupling and subsequent reduction of 4-aminophenylhydroxamic acid and either
o
-vanillin (to give L
3
H
3
) or 2-hydroxybenzaldehyde (to give L
4
H
3
). These linear multitopic ligands bind Cu(
ii
) centres at both the hydroxamate and phenol ends to form the 1-D coordination polymers [Cu(
ii
)(L
3
H
2
)
2
]
n
(
1
) and {[Cu(
ii
)(L
4
H
2
)
2
]·2MeOH}
n
(
2
). Slight differences in the structures of L
3
H
3
and L
4
H
3
lead to significant extended connectivity changes upon Cu(
ii
) metalation that are exampled by a 27% decrease in intra-chain Cu(
ii
) Cu(
ii
) distance upon moving from
1
to
2
. The significant conformation and metal binding differences shown by L
3
H
2
−
and L
4
H
2
−
in
1
and
2
respectively have been rationalised using density functional theory (DFT) calculations. Hirshfeld surface analysis has been employed to assess and visualise the intra- and intermolecular interactions in both complexes.
Two novel hydroxamic acids have been used in constructing two 1-D coordination polymers. Slight structural differences promote connectivity changes upon Cu(
ii
) metalation as rationalised using DFT calculations and Hirschfeld surface analysis. |
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ISSN: | 1466-8033 1466-8033 |
DOI: | 10.1039/d1ce00807b |