Spin-crossover in iron(II)-phenylene ethynylene-2,6-di(pyrazol-1-yl) pyridine hybrids: toward switchable molecular wire-like architectures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73603242" target="_blank" >RIV/61989592:15310/20:73603242 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/20:PU136400

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1361-648X/ab6cc2" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-648X/ab6cc2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-648X/ab6cc2" target="_blank" >10.1088/1361-648X/ab6cc2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spin-crossover in iron(II)-phenylene ethynylene-2,6-di(pyrazol-1-yl) pyridine hybrids: toward switchable molecular wire-like architectures

Popis výsledku v původním jazyce

Luminescent oligo(p-phenylene ethynylene) (OPE) and spin-crossover (SCO) active Fe(II)2,6-di(pyrazol-1-yl) pyridine (BPP) systems are prominent examples proposed to develop functional materials such as molecular wires/memories. A marriage between OPE and Fe(II)-BPP systems is a strategy to obtain supramolecular luminescent ligands capable of metal coordination useful to produce novel spin-switchable hybrids with synergistic coupling between spin-state of Fe(II) and a physical property associated with the OPE skeleton, for example, electronic conductivity or luminescence. To begin in this direction, two novel ditopic ligands, namely L-1 and L-2, featuring OPE-type backbone end-capped with metal coordinating BPP were designed and synthetized. The ligand L-2 tailored with 2-ethylhexyloxy chains at the 2 and 5 positions of the OPE skeleton shows modulated optical properties and improved solubility in common organic solvents relative to the parent ligand L-1. Solution phase complexation of L-1 and L-2 with Fe(BF4)(2)center dot 6H(2)O resulted in the formation of insoluble materials of the composition [Fe(L-1)](n)(BF4)(2n) and [Fe(L-2)](n)(BF4)(2n) as inferred from elemental analyses. Complex [Fe(L-1)](n)(BF4)(2n) underwent thermal SCO centred at T-1/2 = 275 K as well as photoinduced low-spin to high-spin transition with the existence of the metastable high-spin state up to 52 K. On the other hand, complex [Fe(L-2)]n(BF4)(2n), tethered with 2-ethylhexyloxy groups, showed gradual and half-complete SCO with 50% of the Fe(II)-centres permanently blocked in the high-spin state due to intermolecular steric interactions. The small angle x-ray scattering (SAXS) pattern of the as-prepared solid complex [Fe(L-1)](n)(BF4)(2n) revealed the presence of nm-sized crystallites implying a possible methodology towards the template-free synthesis of functional-SCO nanostructures.

Název v anglickém jazyce

Spin-crossover in iron(II)-phenylene ethynylene-2,6-di(pyrazol-1-yl) pyridine hybrids: toward switchable molecular wire-like architectures

Popis výsledku anglicky

Luminescent oligo(p-phenylene ethynylene) (OPE) and spin-crossover (SCO) active Fe(II)2,6-di(pyrazol-1-yl) pyridine (BPP) systems are prominent examples proposed to develop functional materials such as molecular wires/memories. A marriage between OPE and Fe(II)-BPP systems is a strategy to obtain supramolecular luminescent ligands capable of metal coordination useful to produce novel spin-switchable hybrids with synergistic coupling between spin-state of Fe(II) and a physical property associated with the OPE skeleton, for example, electronic conductivity or luminescence. To begin in this direction, two novel ditopic ligands, namely L-1 and L-2, featuring OPE-type backbone end-capped with metal coordinating BPP were designed and synthetized. The ligand L-2 tailored with 2-ethylhexyloxy chains at the 2 and 5 positions of the OPE skeleton shows modulated optical properties and improved solubility in common organic solvents relative to the parent ligand L-1. Solution phase complexation of L-1 and L-2 with Fe(BF4)(2)center dot 6H(2)O resulted in the formation of insoluble materials of the composition [Fe(L-1)](n)(BF4)(2n) and [Fe(L-2)](n)(BF4)(2n) as inferred from elemental analyses. Complex [Fe(L-1)](n)(BF4)(2n) underwent thermal SCO centred at T-1/2 = 275 K as well as photoinduced low-spin to high-spin transition with the existence of the metastable high-spin state up to 52 K. On the other hand, complex [Fe(L-2)]n(BF4)(2n), tethered with 2-ethylhexyloxy groups, showed gradual and half-complete SCO with 50% of the Fe(II)-centres permanently blocked in the high-spin state due to intermolecular steric interactions. The small angle x-ray scattering (SAXS) pattern of the as-prepared solid complex [Fe(L-1)](n)(BF4)(2n) revealed the presence of nm-sized crystallites implying a possible methodology towards the template-free synthesis of functional-SCO nanostructures.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF PHYSICS-CONDENSED MATTER

ISSN

0953-8984

e-ISSN

—

Svazek periodika

32

Číslo periodika v rámci svazku

20

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

"204002-1"-"204002-9"

Kód UT WoS článku

000537544900001

EID výsledku v databázi Scopus

2-s2.0-85082109070