Biomedical subjects

Malcolm A Halcrow

Publications and source records attributed to Malcolm A Halcrow.

30 records · Page 2Linked to original sources

PubMed2003

(eta2-tetracyanoethene)bis(triphenylphosphine-kappaP)palladium-dichloromethane (1/0.7).

The title compound, [Pd(C(6)N(4))(C(18)H(15)P)(2)].0.7CH(2)Cl(2), shows a planar coordination geometry around the metal atom that is an almost perfect isosceles triangle if the tetracyanoethene (tcne) ligand is deemed to occupy a single coordination site. The framework of the tcne ligand shows small distortions due to intramolecular steric contacts between the C[triple-bond]N groups and phenyl rings of the triphenylphosphine ligands.

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PubMed2003

Hexa-mu-chloro-mu4-oxo-tetrakis[[5-(2,4,6-trimethylphenyl)pyrazole-kappaN2]copper(II)].

The title compound, [Cu(4)Cl(6)O(C(12)H(14)N(2))(4)], is a new example of the well known [Cu(4)(mu(4)-O)(mu-X)(6)L(4)] class of complex (X(-) is Cl(-), Br(-) or I(-), and L is a monodentate ligand). The molecule has crystallographic C(2) symmetry, with two Cl(-) ions on each edge of a Cu(4) tetrahedron. Two of these, on opposite edges of the tetrahedron, accept intramolecular hydrogen bonds from two of the pyrazole N-H donors.

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PubMed2003

Bis(2,6-bis[3-(2,4,6-trimethylphenyl)pyrazol-1-yl-kappaN2]pyridine-kappaN)cobalt(II) dinitrate at 290 and 150 K.

The title compound, [Co(C(29)H(29)N(5))(2)](NO(3))(2), contains a six-coordinate high-spin Co(II) ion with approximate local D(2d) symmetry. The bond lengths and angles at cobalt undergo only small changes between the two temperatures, which confirms that the Co(II) ion does not undergo a spin-state transition over this temperature range.

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PubMed2003

Light induced excited high spin-state trapping in [FeL2](BF4)2 (L = 2,6-di(pyrazol-1-yl)pyridine).

The spin-crossover complex [FeL2](BF4)2 undergoes a LIESST transition at 30 K on irradiation; the structures of the low-spin ground and high-spin metastable states at this temperature are presented.

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PubMed2002

A cyclic hexacopper(II) fluoro complex that encapsulates two fluoride anions.

The complex [[Cu3(HpztBu)4(mu-pztBu)2(mu-F)2(mu 3-F)]2]F2 (HpztBu = 3[5]-tert-butylpyrazole) has a cyclic, C2v-symmetric hexacopper core. The two non-coordinated F- anions are encapsulated within cavities formed by three HpztBu ligands.

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PubMed2002

Bis[mu-3[5]-(2-pyridyl)pyrazolido]bis[(acetonitrile)copper(II)] diperchlorate.

The title compound, [Cu(2)(C(8)H(6)N(3))(2)(C(2)H(3)N)(2)](ClO(4))(2), contains a centrosymmetric dinuclear dication, with square-pyramidal Cu(II) centres linked by two 1,2-pyrazolide bridging groups. There is a weak apical interaction between each Cu ion and a perchlorate O atom.

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PubMed2002

[2,6-Bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine]iodocopper(I) dichloromethane solvate.

The title compound, [CuI(C(17)H(21)N(5))] x CH(2)Cl(2), contains a tetracoordinate Cu(I) centre with an unusual distorted tetrahedral stereochemistry, which has also been observed in other Cu(I) complexes containing this tridentate ligand. This distortion is probably a result of intermolecular steric contacts between the I(-) ligand and a neighbouring CH(2)Cl(2) molecule.

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PubMed2002

Tetrakis(5-tert-butylpyrazole-1kappaN2)tetrachloro-1kappaCl,2kappa3Cl-micro-oxo-1:2kappa2O-diiron(III).

The title compound, [Fe(2)Cl(4)O(C(7)H(12)N(2))(4)], contains vertex-sharing distorted tetrahedral [FeOCl(3)](-) and octahedral [FeOCl(Hpz(t)Bu)(4)](+) moieties (Hpz(t)Bu is 5-tert-butylpyrazole), linked by a bent oxo bridging ligand. The two Fe(III) centres are also bridged by intramolecular hydrogen bonds between the pyrazole N-H groups and the O(2-) and Cl(-) ligands.

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PubMed2002

3(5)-tert-butylpyrazole is a ditopic receptor for zinc(II) halides.

The complexes [ZnX(HpztBu)3]X (X- = Cl-, Br-, I-) contain a non-coordinated X- anion hydrogen-bonded within a pocket formed by the HpztBu tert-butyl groups.

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PubMed2002

3,4-(4-Methoxybenzo):8,9-benzobicyclo[4.4.1]undeca-3,8-dien-11-one ethylene acetal.

The title compound, 5-methoxyspiro[tetracyclo[8.8.1.0(3,8).0(12,17)]nonadeca-3,5,7,12,14,16-hexene-19,2'-[1,3]dioxolane], C(22)H(24)O(3), exhibits a twin-chair conformation with the aromatic rings overlying each other. Comparison of the dihedral angle between these two rings with those from previously reported [3.3]orthocyclophanes of this type suggests the presence of a weak attractive charge-transfer interaction between the two, different, stacked arenes.

Acetals↗

PubMed2002

Supramolecular templating of the double-cubane [(Cu3(Hpz(tBu))6(mu3-Cl)(mu3-OH)3)2Cu]Cl6 (Hpz(tBu)=5-tert-butylpyrazole).

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PubMed2001

Bis[2-(pyrazol-3-yl)phenolato-kappa2N2,O]copper(II) dimethanol solvate.

The title compound, [Cu(C9H7N2O)2]*2CH3OH, contains a crystallographically centrosymmetric near-regular square planar Cu(II) centre with trans-disposed chelating ligands. The complex molecules associate into a one-dimensional polymeric chain via hydrogen bonding to the solvent molecules.

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