Morpholine adducts of Co, Ni, and Mn benzoylacetonates: isostructurality and C–H···O hydrogen bonding

Abstract

Morpholine adducts of nickel(II), cobalt(II), and manganese(II) benzoylacetonates, as well as a morpholine solvate of manganese(II) benzoylacetonate, were prepared and characterized by X-ray diffraction and thermal analysis. All four compounds crystallize in the P2 1 /c space group with two complex molecules per unit cell. The morpholine solvate, along with the two adduct molecules, also contains four solvent morpholine molecules in the unit cell. The non-solvate compounds are isostructural, with crystal structures comprising 2D networks formed by C-HÁÁÁO hydrogen bonding between phenyl rings and morpholine oxygen atoms. The topology of these networks can be described as intersecting C 2 2 (24) chains forming R 4 4 (48) rings. Networks with the same topology are also present in the solvate, but they are heavily distorted due to the presence of solvent morpholine molecules. Thermogravimetric analysis shows similar behavior of the non-solvate compounds upon thermal decomposition, with three degradation steps which can be related to gradual loss of morpholine molecules and subsequent overall decomposition. Decomposition of the solvate also proceeds in several steps, the first of which can be related to loss of solvent morpholine molecules and the further steps are analogous to those in the non-solvate compounds.

The palladium-based complexes bearing 1,3-dibenzylbenzimidazolium with morpholine, triphenylphosphine, and pyridine derivate ligands: synthesis, characterization, structure and enzyme inhibitions

“…Since a ligand's ability to form hydrogen bonds with other ligands can have an important effect on coordination geometries. Incorporation of neutral ligands to the complex molecule such as pyridine and amino pyridine which have excellent neutral Lewis bases coordinating to metal ions creates additional hydrogen bonding in the primary coordination sphere, therefore they have used in several examples of coordination chemistry [ [71] , [72] ]. The aminopyridine ligand of the molecule 4 creates strong intermolecular hydrogen bond to the bromine atoms of the chelate plane and C20 carbon atom bounded to imidazole ring (N4–H4B Br2; C20–H20 N4) with change of the molecular packing of the complex.…”

Control of Interpenetration in Two-Dimensional Metal–Organic Frameworks by Modification of Hydrogen Bonding Capability of the Organic Bridging Subunits

“…However, when methanol is employed, solvent molecules replace some of the L2 ligand. As this does not occur in the case of L1 , one is led to the conclusion that the ligand replacement is not facilitated (solely) by MeOH being a “better” ligand than L2 , but rather by additional hydrogen bonding of MeOH molecules, as hydrogen donors, to L2 carbonyl atoms, an interaction impossible both in 1 and 3 . , However, when the solvent employed is a sterically more demanding ethanol, the solvent molecules cannot incorporate in the structure, and the crystallized product is a solvent free [Mn(NCS) 2 L2 2 ] n network, 2 , in which close packing is achieved by interpenetration.…”

Bis(morpholine) hydrogen bond pincer – a novel series of heteroleptic Cu(ii) coordination compounds as receptors for electron rich guests

“…9 In either case, the geometry of the primary coordination sphere determines the geometry of the binding sites for recognition and specific binding of guest molecules in the second coordination sphere. 3a,5 Morpholine (morph) has been recognised as a convenient ligand for the design of supramolecular structures, 10 since it is a ditopic heterocyclic molecule that can coordinate the metal ion via one heteroatom, leaving the other free for linking to other molecules either by coordination to metal ions 11 or by hydrogen bonding. 12 The coordination of a morpholine molecule to a metal ion activates the morpholine molecule as a hydrogen bond donor by increasing the partial positive charge of the morpholine amine hydrogen.…”