Kyoung-Tae Youm

Design and properties of mixed metal multinuclear molecules: Part 1. Molecular structures of [Ag(PR3)2]2[Ni(mnt)2] type complexes (R=Me, Et, Cy and mnt=maleonitriledithiolate) and [AgL]2[Ni(mnt)2] type complexes with chelating diphosphines (L=dppf and dppm)

The trinuclear complexes [Ag(PR 3 ) 2 ] 2 [Ni(mnt) 2 ] and [AgL] 2 [Ni(mnt) 2 ] have been prepared by reactions of (NEt 4 ) 2 [Ni(mnt) 2 ] and Ag 2 SO 4 with alkyl phosphines (PR 3 =P(CH 3 ) 3 (PMe 3 ) for 1 , P(C 2 H 5 ) 3 (PEt 3 ) for 2 and P(C 6 H 11 ) 3 (PCy 3 ) for 3 ), or with chelating diphosphines (L=1,1′-bis(diphenylphosphino)ferrocene (dppf) for 4 and bis(diphenylphosphino)methane (dppm) for 5 ). The structures of all the complexes have been determined by X-ray crystallography. Interactions between the [Ag(PR 3 ) 2 ] + and [Ni(mnt) 2 ] 2− groups occur in compounds 1 and 2 with NiAg distances of 3.063(4) and 2.9311(6) A, respectively. Only one sulfur atom of each mnt ligand bridged [Ag(PR 3 ) 2 ] + cations and [Ni(mnt) 2 ] 2− anions in compound 1 through 3 with AgS distances of about 2.7 A. There is no interaction between Ag and Ni in compound 3 due to the flexibility of the cyclohexyl groups. Interactions between [AgL] + and [Ni(mnt) 2 ] 2− groups also occur in compound 4 with a much shorter AgNi distance of 2.7213(7) A, while silver atoms and the NiS 4 plane in compound 4 make a chair conformation with AgS distances of about 2.8 A. In compound 5 , dppm bridges two silver atoms, and interaction between silver atoms occurs at a distance of 2.9859(11) A, and only one sulfur atom of mnt is used to bridge Ni and Ag atoms with AgS distances of 2.582(3) and 2.663(3) A.

Copper(II) complexes of 1,3-dithian-2-ylidenemalonate: doubly layered 2D sheet induced by alkali metal ions

Abstract Novel doubly layered 2D sheets of M 2 [Cu(DTAYM) 2 (H 2 O) m ]· n H 2 O (M=K, m =0, n =2 for compound 1 ; M=Na, m =1, n =4 for compound 2 ; M=Rb, m =1, n =2 for compound 3 ) have been synthesized and characterized by single crystal X-ray structure studies. In compounds 1 , 2 and 3 the alkali metal ions hold each layer by binding oxygen donor atoms from hydrated water and DTAYM. Basic frameworks are an oxo-bridged dimer for 1 and monomers for 2 and 3 of which the apical site is occupied by hydrate water.

Synthesis of RuHCl(CO)(Hdmpz)(L)2 (L=PPh3, AsPh3, and Hdmpz=3,5-dimethylpyrazole) and crystal structure of RuHCl(CO)(Hdmpz)(AsPh3)2

Abstract Treatment of RuHCl(CO)(L)3 with a slight excess amount of K[HB(3,5-Me2pz)3] in boiling MeOH solution yielded unusual 3,5-dimethylpyrzaole (Hdmpz) complexes, RuHCl(CO)(Hdmpz)(L)2 (L=PPh3, 1 or AsPh3, 2). Unexpectedly the dissociation of the bonds between the boron atom and the nitrogen atoms of the potentially tridentate [HB(3,5-Me2pz)3]− ligand during the coordination of the ligand to the RuII metal has been observed. In a separate preparation, the RuHCl(CO)(Hdmpz)(PPh3)2 complex has also been synthesized from the reaction between RuHCl(CO)(PPh3)3 and the monodentate Hdmpz ligand. Complexes 1 and 2 have been characterized by elemental analysis, IR and 1H NMR spectroscopies. Compound 1 has also been prepared by the reaction between RuHCl(CO)(PPh3)3 and K[H2B(3,5-Me2pz)2] in boiling toluene solution. The crystal structure of 2 has been studied by X-ray crystallography. The geometrical structure around RuII of 2 is a distorted octahedral structure. The crystal structure of 2 consists of a discrete monomeric compound. It is interesting to find that the sterically-demanding [HB(3,5-Me2pz)3]− or [H2B(3,5-Me2pz)2]− ligands break up during the reaction with the RuII complexes to form the neutral 3,5-dimethylpyrazole complexes. In contrast to these observations, [H2Bpz2]− and [H2B(4-Brpz)2]− ligands form very stable RuII complexes.

Multiple-decked Gd(III) complexes induced by hydrogen bonds depending on anions

Hydrogen bonds assembled aquo Gd(III) moieties and btp into a discrete triple-decked complex and a 1-D propagating multiple-decked complex, depending on the anions.

Tetrakis(μ-6-chloropyridin-2-olato)methoxydiruthenium(II, III)

The title complex, tetrakis(μ-6-chloropyridin-2-olato)-1κ 4 O,2κ 4 N-methoxy-1κO-diruthenium(II,III)(Ru-Ru), [Ru 2 (C 5 H 3 ClNO) 4 (CH 3 O)], has a totally polar arrangement of the chp ligands (chp is 6-chloro-2-hydroxypyridine), and one methoxy group occupies the sterically available axial position. The bond distance between the two Ru atoms is 2.2559 (5) A. The axially coordinated methoxy group is bound to the Ru atom with an Ru-O bond distance of 2.250 (3) A.