Richard Moody

Complexes of ligands providing endogenous bridges. Part 1. The syntheses and crystal structures of barium and lead(II) complexes of macrocyclic Schiff bases derived from heterocyclic dicarbonyls and 1, n-diamino-n′-hydroxyalkanes (n,n′= 3,2; 4,2; or 5,3)

Barium and lead(II) complexes of tetraimine Schiff base macrocycles derived from the (2 + 2) condensation of heterocyclic dicarbonyls (2,6-diacetylpyridine and furan-2,5-dicarbaldehyde) and 1,n-diamino-n′-hydroxyalkanes (1,3-diamino-2-hydroxypropane, 1,4-diamino-2-hydroxybutane, and 1,5-diamino-3-hydroxypentane) are reported. The crystal structures of four complexes have been determined.

Complexes of ligands providing endogenous bridges. Part 4. Copper(II) complexes of macrocyclic Schiff bases derived from 2,6-diacetylpyridine and 1,n-diamino-n′-hydroxyalkanes (n,n′= 3,2; 4,2; and 5,3): synthesis, properties, and structures

The synthesis, physicochemical properties, and X-ray crystal and molecular structures of three dinuclear copper (II)complexes of tetraimine Schiff-base macrocycles derived from 2,6-diacetylpyridine and 1,n-diamino-n′-hydroxyalkanes (n,n′= 3,2; 4,2; and 5,3) are reported. The complex derived from a 20-membered macrocycle has present a single endogenous alkoxy bridge and so can serve as a speculative model for the dicopper(II) site in oxyhaemocyanin. As the ring size is increased this bridge is lost and is replaced by an unusually short hydrogen bond between the protonated and deprotonated hydroxyl groups.

Complexes of ligands providing endogenous bridges. Part 6. The X-ray crystal structure and magnetic properties of a hexanuclear copper(II) aggregate bearing µ3-Cu3(OH) cores supported by 4-nitro-2,6-bis[(salicylideneamino)methyl]phenolate ligands

The adventitious self-assembly of a hexanuclear copper(II) aggregate [{Cu3L(OH)(dmf)}2(µ-Cl)(µ-L)]·2dmf (dmf = dimethylformamide) during the recrystallisation of a dinuclear copper(II) hydroxo-complex derived from 4-nitro-2,6-bis[(salicylideneamino)methyl)]phenol (H3L) is reported together with an account of the magnetic properties of the aggregate. The crystal structure of the aggregate consists of two µ3-Cu3(OH) cores held by three peripheral bridging ligands and a µ-chloro bridge. The compound crystallises in the triclinic space group P(Ci, no. 2) and has unit-cell dimensions a= 13.288(10), b= 14.678(7), c= 22.591(23)A, α= 102.96(6), β= 89.07(7), γ= 113.15(5)°, and Z= 2. Antiferromagnetic coupling is observed with J values of –51, –70, and –72 cm–1 noted for the three dicopper pairings. The complexity of the system however leaves an uncertainty in the interpretation of the magnetic data, illustrating an inherent weakness in the capability of the technique to deal with high-nuclearity clusters.

Complexes of ligands providing endogenous bridges. Part 2. The non-template synthesis of tetraimine Schiff base macrocycles derived from 1,3-diamino-2-hydroxypropane

The synthesis of metal-free tetraimine Schiff base macrocycles derived from the (2 + 2) condensation of 1,3-diamino-2-hydroxypropane with pyrrole-2,5-dicarbaldehyde and with thiophene-2,5-dicarbaldehyde are described.

Compartmental ligands. Part 10. Syntheses and crystal and molecular structures of the copper(II) complexes of Schiff bases derived from 1-(pyrrol-2-yl)butane-1,3-dione and 1,3-bis-(2-aminophenoxy)propane, and from pyrrole-2-carbaldehyde and 3,6-dioxaoctane-1,8-diamine

The synthesis of the acyclic Schiff bases H4L7 and H2L8, derived from 1-(pyrrol-2-yl)butane-1,3-dione and 1,3-bis(2-aminophenoxy)propane, and from pyrrole-2-carbaldehyde and 3,6-dioxaoctane-1,8-diamine, respectively are reported, together with their respective copper(II) complexes. Crystals of [Cu(H2L7)] are monoclinic; R= 0.0549 for 1 901 observed reflections. The copper is co-ordinated in the inner (N2O2) compartment with a trans mode of attachment by the ligand; the approximately square-planar co-ordination geometry shows a significant tetrahedral distortion. The pyrrole and ether functions are not bonded to the copper. In the structure of [Cu(HL8)(O2CMe)](R= 0.0363, 4 800 reflections), the co-ordination geometries of the copper atoms in the two independent molecules are tetragonally-distorted octahedral, the two long axial bonds being to one acetate oxygen and to one of the ether oxygen atoms; one pyrrole residue is not co-ordinated to copper.