Biomedical subjects

Atsushi Yagasaki

Publications and source records attributed to Atsushi Yagasaki.

4 recordsLinked to original sources

PubMed2006

Icosaniobate: a new member of the isoniobate family.

Icosaniobate [Nb20O54]8- was synthesized by reacting [H4Nb6O19]4- with NO in tetrahydrofuran or MeNO2. A single-crystal X-ray diffraction study of its n-tetrabutylammonium salt [a = 17.7284(18) A, b = 33.542(3) A, c = 34.316(2) A, Z = 4, and space group P22(1)2(1)] revealed a dimeric structure where two decaniobate ions are condensed sharing two terminal O atoms. Unlike that in [(NbW5O18)2O]4-, the Nb-O-Nb bridges in icosaniobate are bent. The nonlinear bridging reduces the maximum possible symmetry of the dimeric anion to mm2, which it closely approximates.

Journal Article↗

PubMed2005

Methoxide of an Anderson-type polyoxometalate and its conversion to a new type of species, [IMo9O32(OH)(OH2)3]4-.

A totally new type of polyoxometalate, [IMo(9)O(32)(OH)(OH(2))(3)](4)(-), has been synthesized by reacting [IMo(6)O(22)(OMe)(2)](3)(-) with water. The [IMo(9)O(32)(OH)(OH(2))(3)](4)(-) anion further transforms into [(IMo(7)O(26))(2)](6)(-), a molecular oxide that has a rutile core, in dry acetonitrile, while it stays intact for several hours in wet acetonitrile.

Journal Article↗

PubMed2004

[(IMo(7)O(26))(2)](6)(-): A missing link between molecular and solid oxides.

A new molecular oxide, [(IMo(7)O(26))(2)](6)(-), that has a self-contained structure has been synthesized. Its structural relevance both to the rutile structure and several molecular oxides that had been classified as "strange ones with odd structures" has given some insights as to why those species assume such structures. The novel yet self-contained nature of the structure suggests the existence of a new class of molecular oxides of related structures.

Journal Article↗

PubMed2002

(Et4N)4[V4O12].2H2O.

The title compound, tetrakis(tetraethylammonium) cyclo-tetra-micro-oxo-tetrakis[dioxovanadium(V)] dihydrate, (C(8)H(20)N)(4)[V(4)O(12)].2H(2)O, was obtained by reacting V(2)O(5) with (C(2)H(5))(4)NOH. It consists of a discrete centrosymmetric molecular anion, [V(4)O(12)](4-), where four tetrahedral VO(4) units share two vertices with each other to form a ring. A water molecule is attached on each side of the ring through hydrogen bonds.

Journal Article↗