title: 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.
authors: Department of Chemistry, Graduate School of Science, Tohoku University and CREST (JST), Aramaki, Aoba-ku, Sendai 980-8578, Japan. kajiwara@agnus.chem.tohoku.ac.jp
authors: Takashi
authors: T
authors: Kajiwara
authors: Kensuke
authors: K
authors: Katagiri
authors: Shinya
authors: S
authors: Takaishi
authors: Masahiro
authors: M
authors: Yamashita
authors: Nobuhiko
authors: N
authors: Iki
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D002614:Chelating Agents / Q000494:pharmacology; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D003460:Crystallization; D015195:Drug Design; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008024:Ligands; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D008970:Molecular Weight; D009942:Organometallic Compounds / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*
chemical_list: C519807:4-tert-butylsulfonylcalix(4)arene; D002614:Chelating Agents; D028581:Lanthanoid Series Elements; D008024:Ligands; D009942:Organometallic Compounds; D010636:Phenols; C511968:p-sulfonatocalix(4)arene; D047250:Calixarenes