Structures and hydrogen bonding in the 1:1 and 1:2 complexes of trimethylamine N–oxide with pentachlorophenol

Hydroxylamine as an Oxygen Nucleophile. Structure and Reactivity of Ammonia Oxide

“…The measured pK a of 1 + , which reflects the ionizations of both groups, is close to 6 at 25 °C, while that of Me 3 N + OH, the closest analogue of 1 + , is 4.65. 16 Me 3 N + is more strongly electron-withdrawing than H 3 N + , 17 no doubt because of H-bonding solvation, but these figures clearly suggest that 1z could be present in significant amounts.…”

catena-Poly[1,4-dihydroxy-1,4-diazoniabicyclo[2.2.2]octane [aquatri-μ-chlorido-trichloridodicuprate(II)]]

“…The C-N [1.493 (4)-1.506 (4) Å ] and C-C [1.514 (5)-1.522 (5) Å ] bond lengths are nearly equal to those found previously in other DABCO compounds (Cai, 2011;Xiao, 2010). The N-O bond length [1.410 (4) Å ] is similar to those of other N-oxides of organic cations (Jaskolski & Kosturkiewicz, 1984;Tykarska et al, 1999). The presence of the organic cations may contribute to the formation of the interesting zigzag chains.…”

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“…Von der Natur der starken H-Bru È cken in 3, zwei catenierenden (ii) x ± 0,5, y ± 0,5, z; (iii) x, ±y, z + 0,5; (iv) x + 0,5, ±y + 0,5, z + 0,5; (v) x ± 0,5, ±y + 0,5, z + 0,5; (vi) x + 1, y, z; (vii) ±x + 0,5, y + 0,5, ±z + 1,5; (viii) ±x + 0,5, y ± 0,5, ±z + 0,5; (ix) ±x + 1, ±y + 2, ±z + 1; (x) ±x + 1, ±y + 1, ±z + 1; (xi) x, ±y + 1,5, z ± 0,5; (xii) ±x + 1, ±y + 1, ±y + 1, ±z; (xiii) x, ±y + 0,5, z + 0,5, b) bei 2 und 3: CH-Donoren aus Pr 4 N + -Kation [a-sta È ndig: C (41,44,47), b-sta È ndig: C ( Di(4-carbamoylbenzolsulfonyl)amin (1 j). 1 und 2).…”

“…Auûerdem zeigt die Aminoxid-Komponente von 4 eine auffa È llige Diskrepanz der Winkel O±N±C, wie sie dem [Me 3 NOH] + -Kation eigentu È mlich ist[40,41]; fu È r 4 wurde gefunden: ±N(2)±C(6). Die Analogie zu noch markanteren Wechselbeziehungen zwischen Faltungsgrad des Anions und Optimierungsbestreben von Metall-O/N-Koodinationsnetzwerken [14] liegt auf der Hand.…”