Covalent Embedding of Ni2+/Fe3+ Cyanometallate Structures in Silica by Sol-Gel Processing

• Published in: Chemistry : a European journal Vol. 20; no. 30; pp. 9212 - 9215
• Main Authors: Felbermair, Elisabeth, Sidorenko, Andrey, Paschen, Silke, Akbarzadeh, Johanna, Peterlik, Herwig, Schubert, Ulrich
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 21.07.2014; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: Chemistry; Communications; cyanometallates; iron; magnetic properties; nickel; sol-gel processes; nickel; iron; magnetic properties; cyanometallates; sol-gel processes
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.201402805

Compound [Ni(AEAPTS)2]3[Fe(CN)6]2 (AEAPTS=N‐(2‐aminoethyl)‐3‐aminopropyltrimethoxysilane), in which Ni2+ and Fe3+ ions are ferromagnetically coupled through cyano bridges, was prepared. Sol–gel processing of the AEAPTS derivative resulted in incorporation of the cyanometallate in silica. The obtained material is magnetically ordered below 22 K with an effective magnetic moment μeff of 4.46 μB at room temperature, a maximum of 8.60 μB at approximately 15 K and a narrow hysteresis at 2 K, with a saturation remanence of about 300 emu mol−1 and a coercitivity of 0.03 T. Magnetic crowd: [Ni(AEAPTS)2]3[Fe(CN)6]2 (AEAPTS = N‐(2‐aminoethyl)‐3‐aminopropyltrimethoxysilane) was covalently tethered to silica gel. The obtained material is magnetically ordered below 22 K with an effective magnetic moment μeff of 4.46 μB at room temperature, a maximum of 8.60 μB at approximately 15 K, and a narrow hysteresis at 2 K (saturation remanence≈300 emu mol−1, coercitivity 0.03 T).