Spinzustandsmuster in oberflächenfixierten “Perlenschnüren” aus Eisen(II)‐Komplexen

Alam, Mohammad Sahabul; Stöcker, Michael; Gieb, Klaus; Müller, Paul; Haryono, M.Sc. Ir. T.; Student, Katja; Grohmann, Andreas

doi:10.1002/ange.200905062

Cited by 23 publications

(9 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For a review concerning the organization of electronically bistable molecule or molecular switches on surfaces see [ 4 ]. The deposition of single molecule magnets (SMMs) has received increased attention [ 12 – 14 ] and several strategies have been designed to deposit these materials as rows [ 15 ], thin films [ 16 – 19 ], or multilayers [ 20 – 26 ]. However, the limited thermal and kinetic stability of most SMMs prevents their thermal evaporation [ 27 ] and has initiated the search for milder, solution-based methods for surface functionalization.…”

Section: Introductionmentioning

confidence: 99%

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

Börner¹,

Blömer²,

Kischel³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

The chemisorption of magnetically bistable transition metal complexes on planar surfaces has recently attracted increased scientific interest due to its potential application in various fields, including molecular spintronics. In this work, the synthesis of mixed-ligand complexes of the type [NiII 2L(L’)](ClO4), where L represents a 24-membered macrocyclic hexaazadithiophenolate ligand and L’ is a ω-mercapto-carboxylato ligand (L’ = HS(CH2)5CO2 − (6), HS(CH2)10CO2 − (7), or HS(C6H4)2CO2 − (8)), and their ability to adsorb on gold surfaces is reported. Besides elemental analysis, IR spectroscopy, electrospray ionization mass spectrometry (ESIMS), UV–vis spectroscopy, and X-ray crystallography (for 6 and 7), the compounds were also studied by temperature-dependent magnetic susceptibility measurements (for 7 and 8) and (broken symmetry) density functional theory (DFT) calculations. An S = 2 ground state is demonstrated by temperature-dependent susceptibility and magnetization measurements, achieved by ferromagnetic coupling between the spins of the Ni(II) ions in 7 (J = +22.3 cm−1) and 8 (J = +20.8 cm−1; H = −2JS1S2). The reactivity of complexes 6–8 is reminiscent of that of pure thiolato ligands, which readily chemisorb on Au surfaces as verified by contact angle, atomic force microscopy (AFM) and spectroscopic ellipsometry measurements. The large [Ni2L] tail groups, however, prevent the packing and self-assembly of the hydrocarbon chains. The smaller film thickness of 7 is attributed to the specific coordination mode of the coligand. Results of preliminary transport measurements utilizing rolled-up devices are also reported.

show abstract

Section: Introductionmentioning

confidence: 99%

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

Börner¹,

Blömer²,

Kischel³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…13 Weiterhin wurde berichtet, dass Konformationsänderungen die magnetischen Eigenschaften von Molekülen auf Oberflächen beeinflussen 14. 15 Ultradünne Lagen von SCO‐Molekülen wurden aus Lösung auf hochorientiertem pyrolytischem Graphit abgeschieden 16. 17 Spektroskopische Unterschiede zwischen Clustern wurden High‐ und Low‐Spin‐Zuständen zugeordnet, wobei keine Einzelmolekül‐Auflösung zur Verfügung stand 16.…”

unclassified

“…15 Ultradünne Lagen von SCO‐Molekülen wurden aus Lösung auf hochorientiertem pyrolytischem Graphit abgeschieden 16. 17 Spektroskopische Unterschiede zwischen Clustern wurden High‐ und Low‐Spin‐Zuständen zugeordnet, wobei keine Einzelmolekül‐Auflösung zur Verfügung stand 16. Die Beobachtung eines Kondo‐Effekts von einem Eisen(II)‐Komplex in Elektronentransport‐Experimenten wurde Spin‐Crossover zugeschrieben 18…”

unclassified

Elektroneninduzierter Spin‐Crossover von Einzelmolekülen in einer Doppellage auf Gold

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Because of the numerous reports of artifacts [15] caused by solvent-substrate interactions and HOPG cleaving, extensive CITS [16] studies were performed to determine the effects of the solvent or the structural artifacts on imaging. Since the CITS technique gives an exact spatial correspondence between topography and energy-resolved spectroscopy, any structural artifacts of the HOPG surface can be avoided.…”

Section: Introductionmentioning

confidence: 99%

Self‐Assembly of a Mononuclear [Fe^III(L)(EtOH)₂] Complex Bearing an n‐Dodecyl Chain on Solid Highly Oriented Pyrolytic Graphite Surfaces

Ako

Alam

Rahman

et al. 2012

Chemistry A European J

View full text Add to dashboard Cite

The synthesis and structures of the N-[(2-hydroxy-3-methyl-5-dodecylphenyl)methyl]-N-(carboxymethyl)glycine disodium salt (HL) ligand and its neutral mononuclear complex [Fe(III) (L)(EtOH)(2)] (1) are reported. Structural and electronic properties of 1 were investigated by using scanning tunneling microscopy (STM) and current imaging tunneling spectroscopy (CITS) techniques. These studies reveal that molecules of 1 form well-ordered self-assemblies when deposited on a highly oriented pyrolytic graphite (HOPG) surface. At low concentrations, single or double chains (i.e., nanowires) of the complex were observed, whereas at high concentration the complex forms crystals and densely packed one-dimensional structures. In STM topographies, the dimensions of assemblies of 1 found on the surface are consistent with dimensions obtained from X-ray crystallography, which indicates the strong similarities between the crystal form and surface assembled states. Double chains are attributed to hydrogen-bonding interactions and the molecules align preferentially along graphite defects. In the CITS image of complex 1 a strong tunneling current contrast at the positions of the metal ions was observed. These data were interpreted and reveal that the bonds coordinating the metal ions are weaker than those of the surrounding ligands; therefore the energy levels next to the Fermi energy of the molecule should be dominated by metal-ion orbitals.

show abstract

Spinzustandsmuster in oberflächenfixierten “Perlenschnüren” aus Eisen(II)‐Komplexen

Cited by 23 publications

References 45 publications

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

Elektroneninduzierter Spin‐Crossover von Einzelmolekülen in einer Doppellage auf Gold

Self‐Assembly of a Mononuclear [Fe^III(L)(EtOH)₂] Complex Bearing an n‐Dodecyl Chain on Solid Highly Oriented Pyrolytic Graphite Surfaces

Contact Info

Product

Resources

About

Spinzustandsmuster in oberflächenfixierten “Perlenschnüren” aus Eisen(II)‐Komplexen

Cited by 23 publications

References 45 publications

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands

Elektroneninduzierter Spin‐Crossover von Einzelmolekülen in einer Doppellage auf Gold

Self‐Assembly of a Mononuclear [FeIII(L)(EtOH)2] Complex Bearing an n‐Dodecyl Chain on Solid Highly Oriented Pyrolytic Graphite Surfaces

Contact Info

Product

Resources

About

Self‐Assembly of a Mononuclear [Fe^III(L)(EtOH)₂] Complex Bearing an n‐Dodecyl Chain on Solid Highly Oriented Pyrolytic Graphite Surfaces