title: Regioselective bis-functionalization of endohedral dimetallofullerene, La2@C80: extremal La-La distance.
abstract: Bis-functionalization of endohedral metallofullerene La(2)@C(80) by carbene addition is reported herein. Adducts were characterized using spectroscopic and single-crystal X-ray structure analyses. Crystallographic data for bisadduct La(2)@C(80)(CClPh)Ad (3, Ad = adamantylidene) revealed that both carbene additions occur at the 6,6-bond junction on the C(80) cage with ring cleavages and that La atoms are positioned collinearly with spiro carbons. It is noteworthy that the La-La distance in 3 is highly elongated by carbene bis-functionalization compared to the distance in pristine La(2)@C(80) and reported functionalized derivatives. The metal positions were confirmed through density functional calculations.
authors.affiliation: TARA Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Midori O
authors.initials: MO
authors.lastname: Ishitsuka
authors.forename: Shogo
authors.initials: S
authors.lastname: Sano
authors.forename: Haruka
authors.initials: H
authors.lastname: Enoki
authors.forename: Satoru
authors.initials: S
authors.lastname: Sato
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Nikawa
authors.forename: Takahiro
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Slanina
authors.forename: Naomi
authors.initials: N
authors.lastname: Mizorogi
authors.forename: Michael T H
authors.initials: MT
authors.lastname: Liu
authors.forename: Takeshi
authors.initials: T
authors.lastname: Akasaka
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nagase