The copper-catalyzed 1,3-dipolar cycloaddition of an azide to a terminal alkyne (CuAAC) is one of the most popular chemical transformations, with applications ranging from material to life sciences. However, despite many mechanistic studies, direct observation of key components of the catalytic cycle is still missing. Initially, mononuclear species were thought to be the active catalysts, but l...

In the dinuclear title compound, [Zn(2)(C(14)H(12)N(3)O(2)S)(2)Cl(2)]·4C(3)H(7)NO, the two monodeprotonated Schiff base ligands N,O,S:O-chelate to Zn atoms. The formally negatively charged O atom involved in chelation also serves as a bridge. The O, O', N and S atoms comprise a square, and the Cl atom the apex of a square pyramid surrounding each metal atom. The solvate dimethyl-formamide mol-e...

Z. Naturforsch. 54 b, 1147-1154 (1999); received June 2, 1999 Dinuclear Complexes, NIR Dyes, Cobalt, Tripodal Ligands, Bridging Ligands Dinuclear Co(III) complexes of the type [(triphos)Co(C6X2Z' Z2Z3Z4)Co(triphos)]2+ (Z1 ~4 = O, NR, S; R = H, Me; X = H, Cl, Br, I; 1 62+) have been prepared and characterized by MS, IR, NMR, cyclovoltammetric and UV/VIS/NIR measurements and by X-ray analyses (12...

Assembly of dysprosium(iii) salts with versatile hydrazone H3L affords a variety molecular magnetic compounds from mononuclear, dinuclear, grid-like tetranuclear to linear 1D chain.

In the title dinuclear compound, [Zn(2)(C(6)H(6)N(3)O)(2)(C(6)H(7)N(3)O)(2)](NO(3))(2), the Zn(II) cation is N,N'-chelated by one pyridine-2-carboxamide oximate anion and one pyridine-2-carboxamide oxime mol-ecule, and is further bridged by an oxime O atom from the adjacent pyridine-2-carboxamide oximate anion, forming a distorted trigonal bipyramidal coordination. Two pyridine-2-carboxamide ox...

Two nicotinate binding modes are observed in the dinuclear title compound, [Sn(2)(C(7)H(6)Br)(4)(C(6)H(4)NO(2))(4)(H(2)O)(2)]: in the first, a terminal O,O'-chelating molecule binds to a water-coordinated diorganotin cation, while the second mode corresponds to an O:N-bridging molecule which binds to two cations. The two Sn atoms exist in trans-C(2)SnNO(4) penta-gonal-bipyramidal geometries. Ad...

A modification of the previously developed synthetic approach towards dinuclear flexibly linked salphen complexes is successfully utilized for the preparation of heterodinuclear salphen dimers. A dinuclear salphen species with Pd(II) and Cr(III) centers bears a stronger structural resemblance to the related bis-Cr(III) compound than the corresponding mononuclear Cr(III) salphen complex. Therefo...

In the title centrosymmetric dinuclear Eu(III) complex, [Eu(2)(CH(3)COO)(6)(C(12)H(8)N(2))(2)], each Eu(III) cation is coordinated by seven O atoms from five acetate anions and two N atoms from one phenanthroline ligand in a distorted tricapped trigonal-prismatic geometry. Four acetate anions bridge two Eu(III) cations to form the dinuclear complex, with an Eu⋯Eu distance of 3.9409 (8) Å. Weak ...

In the title dinuclear complex, [Cu(2)(C(5)H(10)NO(2))(2)(C(10)H(8)N(2))(3)(H(2)O)(2)](NO(3))(2)·2H(2)O, each of the two l-valinate anions chelates a Cu(II) center through the amino N and carboxyl-ate O atom, forming a five-membered ring. A 4,4'-bipyridine mol-ecule bridges two water-coordinated Cu atoms, each of which is connected to another 4,4'-bipyridine, giving rise to a square-pyramidal c...