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The new mononuclear complex [Ni(TAMEN)](ClO4)2·DMF (TAMEN = N,N′-tetra-(4-antipyrylmethyl)-1,2-diaminoethane) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction. It crystallizes with monoclinic symmetry, space group P21/c (no. 14) and unit cell parameters of a = 10.8736(3), b = 10.9560(4), c = 45.820(2) A, β = 90.23(1)°, Z = 4. The TAMEN molecule acts as a hexadentate ligand incorporating a 1,2-diaminoethane bridge in the staggered conformational gauche isomer. The nickel(II) ion is octahedrally coordinated with metal-ligand distances ranging from 2.023(2) to 2.145(3) A. Electronic and vibrational spectroscopy data agree well with the crystal structure.

The synthesis of the Mannich base N,N′-tetra(antipyryl-4-methyl)-1,2-ethanediamine (TAMEN) (1), its crystal structure as well as the synthesis and the crystal structure of the copper complex [Cu(TAMEN)](ClO4)2·H2O·DMF (2) are reported. C50H56N10O4·2C2H5OH (TAMEN·2EtOH) crystallizes with triclinic symmetry, space group , lattice parameters: a = 877.3(1), b = 1078.1(1), c = 1433.3(2) pm, α = 71.93(1), β = 82.16(1), γ = 84.54(1)° and Z = 1. The copper complex [Cu(TAMEN)](ClO4)2·H2O·DMF also crystallizes with triclinic symmetry, space group , lattice parameters: a = 1279.2(2), b = 1485.6(2), c = 1513.6(2) pm, α = 98.04(1), β = 101.24(1), γ = 94.66(1)° and Z = 2. The copper(II) atom is six-coordinate with an elongated pseudo-octahedral geometry due to a strong Jahn-Teller effect.

The syntheses and the crystal structures of the complexes Co2(BAMP)Cl4 (1) and [Cu(BAMP)(H2O)](ClO4)2(2) are reported. 1 crystallizes in the monoclinic space group C2/c with the unit cell dimensions a = 3129.7(4), b = 772.9(1), c = 1503.4(2) pm, β = 112.47(1)° and Z = 4. Cobalt(II) is surrounded in the fashion of a distorted tetrahedron built from the NO donor atoms of the BAMP ligand and two chloride anions. The copper compound 2 crystallizes in the monoclinic space group I2/a with unit cell dimensions of a = 2539.0(3), b = 1448.1(1), c = 1887.0(2) pm, β = 93.40(1)° and Z = 8. Copper(II) coordination can be described as a square-based pyramid with the N2O2 donor atoms of the BAMP molecule forming the basal plane completed by a water molecule in the apical position. Spectroscopic (IR and UV-Vis) and conductivity data of the new complex compounds are presented. Neue Kupfer(II)- und Cobalt(II)-Komplexe mit dem BAMP-Liganden (N,N′-Bis(antipyryl-4-methyl)-piperazin). Kristallstrukturen von Co2(BAMP)Cl4 und [Cu(BAMP)(H2O)](ClO4)2 Die Verbindungen Co2(BAMP)Cl4 (1) und [Cu(BAMP)(H2O)](ClO4)2 (2) wurden synthetisiert und durch Einkristallrontgenstrukturanalyse charakterisiert. Der Co-Komplex kristallisiert monoklin (C2/c, a = 3129.7(4), b = 772.9(1), c = 1503.4(2) pm, β = 112.47(1)° und Z = 4). Das Co2+-Ion ist verzerrt tetraedrisch von den NO-Atomen des BAMP-Liganden und den Chlorid-Ionen koordiniert. Die Cu-Verbindung 2 kristallisiert in der monoklinen Raumgruppe I2/a mit acht Formeleinheiten in der Elementarzelle (a = 2539.0(3), b = 1448.1(1), c = 1887.0(2) pm, β = 93.40(1)°). Die N2O2-Donor-Atome des BAMP-Liganden bilden gemeinsam mit einem H2O-Molekul einen quadratisch-pyramidablen Koordinationspolyeder um das Cu-Kation. An beiden Verbindungen wurden spektroskopische (IR und UV-Vis) und Leitfahigkeits-Messungen durchgefuhrt.

The complex Co(C14H13NO)2Cl2 with the protonated N-salicylidene-p-toluidine ligand was synthesized from an ethanolic solution of CoCl2·6H2O and N-salicylidene-p-toluidine. The crystal structure was determined from X-ray single crystal data (monoclinic, space group Cc, a = 1496.2(3) pm, b = 1257.4(4) pm, c = 1544.6(3) pm, β = 115.01(1)°, Z = 4). Co2+ adopts a distorted tetrahedral geometry. The UV-Vis and IR spectra of the complex are discussed.

Polar Iminoboranes: Reactions of (tert-Butylimino)(pentafluorophenyl)borane The reactions of the iminoborane C6F5-B≡N-tBu (1) with nitriles and isonitriles are studied. Nitriles RCN give cycloadducts either of the triazadiboracyclohexane type (3a; R = iPr) or of the tetrazatriborabicyclo[4.2.0]octane type [4b-d; R = Ph, p-C6H4Me, p-C6H4(CF3)] or of the (iminomethyl)borazine type (5e, f; R = Me, Et). Isonitriles RNC yield mainly adducts of RNC to a cycloaddition product of the diazadiboracyclopentane type (6a, b; R = 2,6-C6H3Me2, tBu); the adduct of RNC to a diazadiboracyclobutane may be a side-product (7b; R = tBu). The iminoborane Me3Si(tBu)N-B=NtBu reacts with two molecules of (2,6-C6H3Me2)NC to give the corresponding azaboracyclobutane 8. The iminoborane tBu-B≡N-C6F5 (1′), formed by gas-phase elimination of ClSiMe3 from Cl(tBu)B = N(C6F5)SiMe3 (9), cyclodimerizes more readily than the isomeric borane 1. The cyclodimer 2′ gives 1:1-addition reactions with tBuNC, PMe3, and MeNC, respectively; the added components fluctuate in solutions of the products 7b'-d'. A similar fluctuation is observed with the 1:1 adduct 7c from PMe3 and the cyclodimer 2 of the iminoborane 1. The products 3a, 5e, 6a, 8 crystallize in the space groups P21/c, P21/n, Pbca, and P21/c, respectively.