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DOI: 10.1039/A804768E (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 3325-3334

Copper and calcium complexes with the anionic O2-donor 4-tert-butylacetyl-3-methyl-1-phenylpyrazol-5-onato (Q–). Influence of hydrogen-bond interactions on lattice architecture in the crystal structures of [CuQ2(H2O)] and [CaQ2(EtOH)2]

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Fabio Marchetti, Claudio Pettinari, Augusto Cingolani, Dante Leonesi, Andrei Drozdov and Sergei I. Troyanov

Abstract

By interaction of 4-tert-butylacetyl-3-methyl-1-phenylpyrazol-5-one (HQ) with Cu(O2CCH3)2·H2O in EtOH, the derivative [CuQ2(H2O)] 1 has been synthesized. It possesses a square-pyramidal structure with the asymmetric β-diketonate ligands arranged in an “anti[hair space]” configuration to each other and with a molecule of H2O at the apex of polyhedron. Both protons of H2O are involved in an intermolecular hydrogen-bonding network with pyridinic nitrogen atoms of Q donors belonging to two neighbouring complexes. Compound 1 reacts with substituted phenanthrolines (2,9-Me2Phen with 4,7-Ph2Phen) in Et2O to give [CuQ2(2,9-Me2Phen)] and [CuQ2(4,7-Ph2Phen)] derivatives. During the reaction of 1 with an excess of 2,9-Me2Phen in EtOH reduction of copper(II) to copper(I) was observed with formation of the ionic diamagnetic copper(I) derivative [Cu(2,9-Me2Phen)]Q. Ethylenediamine (en) reacted with 1 affording the ionic complex [Cu(en)3]Q2·2H2O. By interaction of 1 with N-methylimidazole (N-MeIm) the compound [CuQ2(N-MeIm)2] has been isolated. Finally the P-donors triphenylphosphine and tricyclohexylphosphine (PCy3) reduced copper(II) affording the copper(I) derivatives [CuQ(PPh3)2] and [CuQ(PCy3)2]. The reaction between HQ and CaCl2 in basic (KOH) EtOH produced the derivative [CaQ2(EtOH)2]. It contains the calcium atom in an axially distorted octahedral environment with the two β-diketonate ligands in “anti” positions and the EtOH molecules trans to each other. The O–Ca–O axis is bent [172.86(6)°]. The protons of the solvent molecules are involved in a hydrogen-bonding network with the nitrogen atoms of Q donors of other molecular units, and the structure is constituted of infinite chains. The derivatives [CaQ2(ROH)2] have been obtained in alcoholic ROH solvents when R = Me, Et or Pri, whereas the [CaQ2(H2O)2] complex formed when R = But, HC[triple bond, length half m-dash]CCH2 or Pri(But)CH. The interaction between [CaQ2(EtOH)2] and 1,10-phenanthroline afforded the adduct [Ca(Q)2(Phen)2].

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