Self-Assembly Properties of Amphiphilic Iron(III) Spin Crossover Complexes in Water and at the Air–Water Interface

Barry O'Hagan, George McKerr, Paulo N Martinho, Irina Kuhne, Brendan Gildea, Tia Keyes, Tibebe Lemma, Claudio Gandolfi, Martin Albrecht, Grace Morgan

Research output: Contribution to journalArticle

Abstract

Abstract: The assembly properties of three known spin crossover iron(III) complexes 1–3, at the air–water interface, are reported. All three complexes are amphiphiles, each bearing a pair of Cn alkyl chains on the polyamino Schiff base sal2trien ligand (n = 6, 12, or 18). Complex 1 is water-soluble but complexes 2 and 3 form Langmuir films, and attempts were made to transfer the film of the C18 complex 3 to a glass surface. The nature of the assembly of more concentrated solutions of 3 in water was investigated by light scattering, cryo-SEM (scanning electron microscopy), and TEM (transmission electron microscopy), all of which indicated nanoparticle formation. Lyophilization of the assembly of complex 3 in water yielded a powder with a markedly different magnetic profile from the powder recovered from the initial synthesis, notably, the spin crossover was almost completely quenched, and the thermal behavior was predominantly low spin, suggesting that nanoparticle formation traps the system in one spin state.
LanguageEnglish
JournalMagnetochemistry
Volume4
Issue number4
Publication statusPublished - 4 Nov 2018

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Self assembly
Iron
Water
Air
Powders
Bearings (structural)
Nanoparticles
Amphiphiles
Scanning electron microscopy
Schiff Bases
Langmuir Blodgett films
Light scattering
Ligands
Transmission electron microscopy
Glass

Cite this

O'Hagan, B., McKerr, G., Martinho, P. N., Kuhne, I., Gildea, B., Keyes, T., ... Morgan, G. (2018). Self-Assembly Properties of Amphiphilic Iron(III) Spin Crossover Complexes in Water and at the Air–Water Interface. Magnetochemistry, 4(4).
O'Hagan, Barry ; McKerr, George ; Martinho, Paulo N ; Kuhne, Irina ; Gildea, Brendan ; Keyes, Tia ; Lemma, Tibebe ; Gandolfi, Claudio ; Albrecht, Martin ; Morgan, Grace. / Self-Assembly Properties of Amphiphilic Iron(III) Spin Crossover Complexes in Water and at the Air–Water Interface. In: Magnetochemistry. 2018 ; Vol. 4, No. 4.
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abstract = "Abstract: The assembly properties of three known spin crossover iron(III) complexes 1–3, at the air–water interface, are reported. All three complexes are amphiphiles, each bearing a pair of Cn alkyl chains on the polyamino Schiff base sal2trien ligand (n = 6, 12, or 18). Complex 1 is water-soluble but complexes 2 and 3 form Langmuir films, and attempts were made to transfer the film of the C18 complex 3 to a glass surface. The nature of the assembly of more concentrated solutions of 3 in water was investigated by light scattering, cryo-SEM (scanning electron microscopy), and TEM (transmission electron microscopy), all of which indicated nanoparticle formation. Lyophilization of the assembly of complex 3 in water yielded a powder with a markedly different magnetic profile from the powder recovered from the initial synthesis, notably, the spin crossover was almost completely quenched, and the thermal behavior was predominantly low spin, suggesting that nanoparticle formation traps the system in one spin state.",
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O'Hagan, B, McKerr, G, Martinho, PN, Kuhne, I, Gildea, B, Keyes, T, Lemma, T, Gandolfi, C, Albrecht, M & Morgan, G 2018, 'Self-Assembly Properties of Amphiphilic Iron(III) Spin Crossover Complexes in Water and at the Air–Water Interface', Magnetochemistry, vol. 4, no. 4.

Self-Assembly Properties of Amphiphilic Iron(III) Spin Crossover Complexes in Water and at the Air–Water Interface. / O'Hagan, Barry; McKerr, George; Martinho, Paulo N; Kuhne, Irina; Gildea, Brendan; Keyes, Tia; Lemma, Tibebe; Gandolfi, Claudio; Albrecht, Martin; Morgan, Grace.

In: Magnetochemistry, Vol. 4, No. 4, 04.11.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Self-Assembly Properties of Amphiphilic Iron(III) Spin Crossover Complexes in Water and at the Air–Water Interface

AU - O'Hagan, Barry

AU - McKerr, George

AU - Martinho, Paulo N

AU - Kuhne, Irina

AU - Gildea, Brendan

AU - Keyes, Tia

AU - Lemma, Tibebe

AU - Gandolfi, Claudio

AU - Albrecht, Martin

AU - Morgan, Grace

PY - 2018/11/4

Y1 - 2018/11/4

N2 - Abstract: The assembly properties of three known spin crossover iron(III) complexes 1–3, at the air–water interface, are reported. All three complexes are amphiphiles, each bearing a pair of Cn alkyl chains on the polyamino Schiff base sal2trien ligand (n = 6, 12, or 18). Complex 1 is water-soluble but complexes 2 and 3 form Langmuir films, and attempts were made to transfer the film of the C18 complex 3 to a glass surface. The nature of the assembly of more concentrated solutions of 3 in water was investigated by light scattering, cryo-SEM (scanning electron microscopy), and TEM (transmission electron microscopy), all of which indicated nanoparticle formation. Lyophilization of the assembly of complex 3 in water yielded a powder with a markedly different magnetic profile from the powder recovered from the initial synthesis, notably, the spin crossover was almost completely quenched, and the thermal behavior was predominantly low spin, suggesting that nanoparticle formation traps the system in one spin state.

AB - Abstract: The assembly properties of three known spin crossover iron(III) complexes 1–3, at the air–water interface, are reported. All three complexes are amphiphiles, each bearing a pair of Cn alkyl chains on the polyamino Schiff base sal2trien ligand (n = 6, 12, or 18). Complex 1 is water-soluble but complexes 2 and 3 form Langmuir films, and attempts were made to transfer the film of the C18 complex 3 to a glass surface. The nature of the assembly of more concentrated solutions of 3 in water was investigated by light scattering, cryo-SEM (scanning electron microscopy), and TEM (transmission electron microscopy), all of which indicated nanoparticle formation. Lyophilization of the assembly of complex 3 in water yielded a powder with a markedly different magnetic profile from the powder recovered from the initial synthesis, notably, the spin crossover was almost completely quenched, and the thermal behavior was predominantly low spin, suggesting that nanoparticle formation traps the system in one spin state.

M3 - Article

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JO - Magnetochemistry

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