Metallopolymers with Schiff Base Side Chains. Synthesis and Characterization of Some Nickel(II) Containing Polymers with Unexpected Cooperative Magnetic Properties

Werner, Rüdiger; Falk, Karsten; Ostrovsky, Serghei; Haase, Wolfgang

doi:10.1002/1521-3935(20011001)202:14<2813::aid-macp2813>3.0.co;2-t

Cited by 18 publications

(1 citation statement)

References 11 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An unusual system showing ferromagnetic exchange interactions was reported by Haase and co-workers [102]. Here, the Schiff base mesogenic units containing Ni(II) metal ions are located in the side chain; however, the units form a ladder-like structure ( figure 19).…”

Section: Mesophasesmentioning

confidence: 69%

Metallo-supramolecular modules as a paradigm for materials science

Kurth

2008

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

Metal ion coordination in discrete or extended metallo-supramolecular assemblies offers ample opportunity to fabricate and study devices and materials that are equally important for fundamental research and new technologies. Metal ions embedded in a specific ligand field offer diverse thermodynamic, kinetic, chemical, physical and structural properties that make these systems promising candidates for active components in functional materials. A key challenge is to improve and develop methodologies for placing these active modules in suitable device architectures, such as thin films or mesophases. This review highlights recent developments in extended, polymeric metallo-supramolecular systems and discrete polyoxometalates with an emphasis on materials science.

show abstract

Section: Mesophasesmentioning

confidence: 69%

Metallo-supramolecular modules as a paradigm for materials science

Kurth

2008

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

show abstract

A Photoinduced Spin Transition Iron(II) Complex with Liquid‐Crystal Properties

Hayami¹,

Danjobara

Inoue

et al. 2004

Advanced Materials

View full text Add to dashboard Cite

Liquid crystals are fascinating functional materials, and are important in advanced materials fields such as electro-optic devices. Organic liquid crystals are diamagnetic and can easily be oriented by an electric field. It is possible to align liquid crystals by a magnetic field in a manner analogous to alignment by an electric field. The construction of metal-containing liquid crystals (metallomesogens) has recently attracted a great deal of attention.[1±6] Strong magnetic fields are necessary to align diamagnetic liquid crystals. On the other hand, metallomesogens containing unpaired electrons are paramagnetic liquid crystals, and the magnetic field strength required to align paramagnetic liquid crystals is much smaller than that required to align diamagnetic liquid crystals. An investigation of magnetic liquid crystals containing rare-earth ions (which are of interest because they often have a large magnetic anisotropy) has been reported. [1] Furthermore, polymeric compounds with nickel(II) side chains have been synthesized; these exhibit cooperative magnetic properties toward constructing ferromagnets with liquid-crystal properties.[3] Therefore, liquid crystals that can be controlled by external fields have been developed. Recently, Galyametdinov et al. reported a spin-crossover iron(III) compound (S = 1/2 « S = 5/2) with liquid-crystal properties.[6] When the magnitude of the intermolecular interactions overcomes a threshold value, spin-crossover occurs. In such a case, the transition between the low-spin and high-spin states is not only very abrupt, but it also occurs with a hysteresis effect. [7] Designing molecules exhibiting bi-stability is one of the main challenges in molecular materials science, in order to utilize them for information processing and storage.[8]Furthermore, multifunction spin-crossover compounds with a supramolecular structure of porous material have been designed, and are of interest because of their specific magnetic or optical properties. [9,10] For some iron(II) spin-crossoverÐhigh-spin (S = 2) « low-spin (S = 0)Ðcompounds, light-induced low-spin ® high-spin conversion can be observed by greenlight illumination into a d±d or MLCT (metal-to-ligand charge transfer) absorption band at temperatures well below the thermal transition temperature. A mechanism for this phenomenon, denoted as ªlight-induced excited spin-state trappingº (LIESST), has been proposed. [11,12] The development of novel compounds exhibiting LIESST is one of the main challenges in this field. [7,13,14] LIESST compounds can be used as opticalswitching molecular devices, and various functional materials including the optical switches can be constructed. Herein, we focus on the use of spin-crossover iron(II) compounds to control liquid crystals not only by temperature, but also by magnetic field and photoillumination. Spin-crossover iron(II) compounds exhibit spin conversion between diamagnetism (S = 0) and paramagnetism (S = 2), and the LIESST effect. The design of metallomesogens containing spin-crossover iron(...

show abstract

Metallopolymers: New Multifunctional Materials

2007

View full text Add to dashboard Cite

Since the mid 1990s soluble, well‐characterized high molecular weight metal‐containing and metallosupramolecular polymers have become readily available for the first time, even in some cases, with narrow molecular weight distributions and controlled architectures such as block copolymers. This has led to a rapidly expanding interest in their properties and uses. The review provides a survey of the range of applications for these new materials, which combine the processing advantages of polymers with the functionality provided by the presence of metal centers.

show abstract

Metallopolymers with Schiff Base Side Chains. Synthesis and Characterization of Some Nickel(II) Containing Polymers with Unexpected Cooperative Magnetic Properties

Cited by 18 publications

References 11 publications

Metallo-supramolecular modules as a paradigm for materials science

Metallo-supramolecular modules as a paradigm for materials science

A Photoinduced Spin Transition Iron(II) Complex with Liquid‐Crystal Properties

Metallopolymers: New Multifunctional Materials

Contact Info

Product

Resources

About