A series of dimeric magnesium derivatives containing substituted pyrrolyl or ketiminato ligands was synthesised and the application of these derivatives for the ring opening polymerisation of ϵ‐caprolactone has been carried out. Reactions of [Mg{N(SiMe3)2}]2 (1) with one equiv. of 2‐dimethylaminomethyl pyrrole and 2‐diethylaminomethyl pyrrole in toluene generates [Mg{C4H3N(2‐CH2NMe2)}{N(SiMe3)2}]2 (2) and [Mg{C4H3N(2‐CH2NEt2)}{N(SiMe3)2}]2 (3), respectively, in high yield. Similarly, the reaction of 1 with one equiv. of 2‐tert‐butylaminomethyl pyrrole in toluene at room temperature affords [Mg{C4H3N(2‐CH2NHtBu)}{N(SiMe3)2}]2 (4). Furthermore, reactions of 1 with one equiv. of HOCMeCHCMeN(C6H3‐2,6‐iPr2) or HOCMeCHCMeN(C6H4‐2‐OMe) in toluene yielded the dimeric magnesium complexes, [Mg{OCMeCHCMeN(C6H3‐2,6‐iPr2)}{N(SiMe3)2}]2 (5) and [Mg{OCMeCHCMeN(C6H4‐2‐OMe)}{N(SiMe3)2}]2 (6), respectively, in satisfactory yields by means of deamination. All the complexes were characterised by NMR spectroscopy and X‐ray diffraction analysis in the solid state. They show moderate reactivity towards the ring opening polymerisation of ϵ‐caprolactone in dichloromethane or tetrahydrofuran.

In the title complex, [Ni(C14H12N3O)2], the NiII atom lies at the centre of a distorted octahedron formed by two tridentate hydrazone ligands. Inter­molecular hydrogen bonds of the type C—H⋯X (X = N, O) link the complexes into a two-dimensional network.

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Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.006 Å; R factor = 0.059; wR factor = 0.189; data-to-parameter ratio = 15.5.In the title complex, [Cu(C 14 H 13 N 3 O)(C 14 H 12 N 3 O)](CCl 3 -COO), the central Cu(II) ion exhibits a distorted octahedral geometry with the two ligands coordinating in an meridional format. The N 4 O 2 ligand environment is defined by two benzoyl O atoms, two pyridyl N atoms and imino N atoms. As evidenced by the bond lengths, the two benzohydrazone ligands exist in distinctively different forms, one of them as a regular neutral ligand and the other as an anionic enolate arising from deprotonation. The much longer Cu-O bond and longer Cu-N bond lengths in the neutral benzohydrazone ligand imply weak ligation in comparison with the anionic enolate form. The acute angles of the five-membered rings cause a significant deviation from a regular octahedral geometry. Related literature ExperimentalCrystal data [Cu(C 14

Two new cyano-bridged trinuclear heterometallic complexes [Ca2(phen)4(ClO4)(H2O)3- Fe(CN)6]・H2O (1) and [Ca2 (phen)4(CH3COO)(H2O)3Fe(CN)6]・2H2O (2) (where phen = 1,10- phenanthroline) have been synthesized and characterized by single-crystal X-ray diffraction techniques, IR spectroscopy and thermogravimetric analysis. The structure of complex 1 features a central [Fe(CN)6]3− unit that links a monocation [Ca(phen)2(H2O)(ClO4)]+ and a dication [Ca(phen)2- (H2O)2]2+ via two trans cyanide bridges. Similarly, complex 2 also features a central [Fe(CN)6]3− unit that links a monocation [Ca(phen)2(H2O)(CH3COO)]+ and a dication [Ca(phen)2(H2O)2]2+ via two trans cyanide bridges. In 1 and 2, both Ca centers are seven-coordinated and achieve a pentagonal- bipyramidal geometry whereas the Fe center in both the complexes possesses a distorted octahedral geometry. Intra- and intermolecular hydrogen bonding networks are present in 1 and 2 that impart the overall molecular stability to both the systems.