A Dodecalanthanide Wheel Supported by p‐tert‐Butylsulfonylcalix[4]arene

Abstract

A dodecaholmium wheel of [Ho12(L)6(mal)4(AcO)4(H2O)14] (1; mal = malonate) was synthesized by using p-tert-butylsulfonylcalix[4]arene (H4L) as a cluster-forming ligand. The wheel consists of three fragments of mononuclear A3- ([Ho(L)(mal)(H2O)]3-), trinuclear B3- ([Ho(H2O)2(mal)(Ho(L)(AcO))2]3-), and C3+ ([Ho(H2O)2]3+), and an alternate arrangement of these fragments (A(3-)-C(3+)-B(3-)-C(3+)-A(3-)-C(3+)-B(3-)-C(3+)-) results in a wheel structure. The longest and shortest diameters of the core were estimated to be 17.7562(16) and 13.6810(13) A, respectively, and the saddle-shaped molecule possesses a pocketlike cavity inside.

A {Co32} Nanosphere Supported by p-tert-Butylthiacalix[4]arene

“…Although there has been a report with six calixarenes bonded to one {Ho 12 } cluster, those six p-tertbutylsulfonylcalix [4]arenes are located on a ring. 21 Analysis of the 6 ], which is also supported by the fact that no absorption peaks for the CH 3 COO -or OH -anions were found in IR spectra. Each Co II site is coordinated by two phenoxyl oxygen, one sulfur, and two µ 3 -O atoms and two coordinated water molecules, while the Co III site is in a distorted octahedral coordination environment with three µ 3 -O atoms and three coordinated water molecules.…”

Strategies towards single molecule magnets based on lanthanide ions

“…An interesting example is Dy 10 (OC 2 H 4 OCH 3 ) 30 [76], which shows a regular ring structure similar to that of the "ferric wheel" [77]. The record in the nuclearity has been later surpassed in a dodecalanthanide wheel supported by calix [4]arene ligands [78]. Among the smaller complexes triangular clusters have received a deal of great attention, as discussed in detail in the following section.…”

Two Series of Sandwich Frameworks Based on Two Different Kinds of Nanosized Lanthanide(III) and Copper(I) Wheel Cluster Units

“…Generally, both mononuclear Ln ions and multinuclear Ln cores could be served as building units for making Ln wheel. Dy 6 ,15 Gd 8 ,4a Dy 10 ,4b and Ho 12 16 are discrete wheels based on mononuclear Ln ions. Tri‐ and tetranuclear are common multi‐nuclear units in the Ln wheels.…”