S.-F. Tung

Di-μ-acetato-bis[dicarbonyl(pyrazole)ruthenium(I)] and Di-μ-acetato-bis[dicarbonyl(3,5-dimethylpyrazole)ruthenium(I)]

The crystal structures of the title compounds, [Ru 2 (C 2 H 3 O 2 ) 2 (C 3 H 4 N 2 ) 2 (CO) 4 ], (1), and [Ru 2 (C 2 H 3 O 2 ) 2 (C 5 H 8 N 2 ) 2 (CO) 4 ], (2), have been determined. The octahedral coordination about the Ru I ion is slightly distorted in (1) and more distorted in (2), with the two O atoms and two C atoms in the equatorial positions, and one N atom and another Ru ion in the axial positions. Compound (2) has mirror symmetry.

(Isothiocyanato-κN)(1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane-κ4N)- copper(II) perchlorate

In [Cu(NCS)(C 14 H 32 N 4 )]ClO 4 , the Cu II ion is fivefold coordinated in a distorted trigonal-bipyramidal environment and the tetradentate macrocyclic ligand coordinates in a folded fashion. All four methyl groups of the macrocycle are disposed towards the same side as the isothiocyanato group.

A selenium-bridged mixed-metal cluster, (CO)5(PPh3)2FePt2(μ3-Se)

Stirring at room temperature of [(CO) 6 Fe 2 {μ-SeC(H)= C(CH 2 OH)Se}] with Pt(PPh 3 ) 4 or Pt(C 2 H 4 )(PPh 3 ) 2 in dichloromethane affords the μ 3 -Se-bridged mixed-metal cluster pentacarbonyl-1κ 3 C,2κC,3κC-μ 3 -selenido-1:2:3κ 3 Se-bis(triphenylphosphine)-2κP,3κP-irondiplatinum(2 Fe-Pt), [FePt 2 (μ 3 -Se)(C 18 H 15 P) 2 (CO) 5 ]. The structure can be described as an FePt 2 Se butterfly; each Pt atom is coordinated by one CO and one PPh 3 group, whereas the Fe atom is bonded to three CO groups. The Fe atom is in a distorted octahedral environment. The bridging Se atom is bonded to the open triangular array of FePt 2 in a μ 3 coordination mode. The geometry around the Pt atoms is distorted square planar.

Chloro(1,4,7,11-tetraazacyclotetradecane-N,N',N,N)zinc(II) perchlorate

In the title compound, [ZnCl(C 10 H 24 N 4 )ClO 4 , the coordination about the Zn II ion is distorted square pyramidal with the four N atoms of the macrocycle in the basal positions and the Cl ion axial. The Zn-Cl and average Zn-N bond lengths are 2.2734 (8) and 2.125 (3) A, respectively.

Bis[2-(1,3-benzothiazol-2-yl)phenolato-O,N]chlorooxorhenium(V)–dichloromethane (1/1.5)

The X-ray structure of the title compound, [Re-(C 13 H 8 NOS) 2 ClO].1.5CH 2 Cl 2 , shows distorted octahedral coordination geometry around rhenium. Bond lengths and angles are typical of related rhenium and technetium complexes. The average Re-N and Re-O distances are 2.140 (4) and 1.977 (4) A, respectively. The Re=O and Re-Cl distances are 1.679 (4) and 2.365 (1) A, respectively.

trans‐Dichloro[(1RS,4RS,5SR,7RS,8SR,11SR,12RS,14SR)‐5,7,12,14‐tetramethyl‐1,4,8,11‐tetraazacyclotetradecane‐κ4N]cobalt(III) Perchlorate

The crystal and molecular structure of the title compound, [CoCl2(C14H32N4)]ClO4, has been determined. The CoIII ion is six-coordinate with a distorted octahedral geometry consisting of the four N atoms of the macrocyclic ligand in equatorial positions and the two Cl atoms in axial positions. The quadridentate macrocyclic ligand adopts its most stable configuration, with two six-membered rings in chair conformations and two five-membered rings in gauche forms.

Two Conformational (Configurational) Isomers of Diperchlorato[(5RS,6RS,12SR,13SR)-5,6,12,13-tetramethyl-1,4,8,11-tetraazacyclotetradecane-κ4N]copper(II)

The crystal structure of the title compound, [Cu(ClO4)2(C14H32N4)], has been determined by X-ray diffraction. X-ray structure analysis reveals that, owing to disorder, the compound exists in two forms, A and B. The coordination polyhedron about the CuIIion is centrosymmetric. The CuII ion is six-coordinated in a distorted octahedral geometry, with the four N atoms of the macrocyclic ligand in equatorial positions and the two perchlorate O atoms in axial positions. The four chiral N-atom centres have a 1RS,4RS,8SR,11SR configuration and a 1SR,4RS,8RS,11SR configuration, respectively, for the two forms A and B. However, both have a 5RS,6RS,12SR,13SR configuration for the four chiral C-atom centres. Hydrogen bonds help stabilize the crystal structure.

[7-Methyl-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),13,15-triene-κ4N](nitrato-κO)copper(II) Nitrate Hydrate

The Cu II ion of the title complex, [Cu(NO 3 )(C 14 H 24 N 4 )]-NO 3 .H 2 O, is five-coordinate and the geometry is distorted square pyramidal, with the four N atoms of the macrocyclic ligand equatorial and an O atom of the nitrato group axial. The tetradentate ligand adopts its most stable conformation, with two six-membered rings in chair forms and two five-membered rings in skew forms. The complex has the 3RS, 11SR configuration for the two chiral N centers.

(1,4,7,11,13-Pentaazacyclohexadecane-κ5N)(perchlorato-κO)nickel(II) Perchlorate

The crystal structure of the title compound, [Ni(ClO 4 )(C 11 H 27 N 5 )]ClO 4 , shows that the Ni II ion is six-coordinate involving the pentadentate macrocycle and one perchlorate O atom. There are two independent molecules in the asymmeteric unit. The conformation of the ligand is in the most stable form, with the six-membered ring in a chair form and all four five-membered rings in gauche forms.