Exploring the Magnetic Behavior of Nickel-Coordinated Pyrogallol[4]arene Nanocapsules

Abstract

The magnetic behavior of nickel-seamed C-propylpyrogallol[4]arene dimeric and hexameric nanocapsular assemblies has been investigated in the solid state using a SQUID magnetometer. These dimeric and hexameric capsular entities show magnetic differentiation both in terms of moment per nanocapsule and potential antiferromagnetic interactions within individual nanocapsules. The weak antiferromagnetic behavior observed at low temperatures indicates dipolar interactions between neighboring nickel atoms; however, this effect is higher in the hexameric nickel-seamed assembly. The differences in magnetic behavior of dimer versus hexamer can be attributed to different coordination environments and metal arrangements in the two nanocapsular assemblies.

An Indium‐Seamed Hexameric Metal–Organic Cage as an Example of a Hexameric Pyrogallol[4]arene Capsule Conjoined Exclusively by Trivalent Metal Ions

“…In that work, retroinsertion of 24 Cu 2+ ions in the framework of hydrogen‐bonded hexameric capsule resulted in substitution of 48 of the 72 phenolic protons involved in hydrogen bonding to yield a structure supported in part by 96 O→Cu coordinate bonds and 24 intramolecular hydrogen bonds. This trend was also observed in other M 24 L 6 systems that contained M 2+ ions . The X‐ray diffraction structural study revealed that the In 3+ /PgC5 hexameric MONC is a charge neutral capsule.…”

“…Peculiarly, these distinctive chemical environments on the upper and lower rims of the PgC n macrocycle impart to it the ability to generate metal‐seamed hexameric supramolecular capsules wherein 6 PgC n units are seamed together by 24 metal ions (M 24 L 6 ). This M 24 L 6 coordination geometry is evident from previous successful attempts to assemble hexameric MONCs based on the metals ions Cu, Ga, Co, Mg, Ni, Zn, and Mn …”

Highly Efficient D2 Generation by Dehydrogenation of Formic Acid in D2O through H+/D+ Exchange on an Iridium Catalyst: Application to the Synthesis of Deuterated Compounds by Transfer Deuterogenation

“…As is common for paramagnets, the sample does not completely saturate even at 5 K under 7 T. The paramagnetic behavior of PgC 1 Fe is similar to that observed for PgC 3 Ni dimers and hexamers or Fc‐enclosed tubes and dimers 4c. 5b, 7, 15…”

Assessment of the in vitro toxicity of calixarenes and a metal-seamed calixarene: a chemical pathway for clinical application

“…Calix [n]arenes and the closely related calix [4]resorcinarenes and pyrogallol [4]arenes constitute a class of cyclic oligomers that can be prepared easily via the reaction of a phenolic substrate with an appropriate aldehyde, typically under acidic conditions. This class of compounds has largely been exploited in supramolecular chemistry for the formation of nanoassemblies and host-guest complexes (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). The structural scaffolds offered by the modifiable upper and lower rims of these cyclic oligomers are at the focal point of their interesting chemistry.…”