David J Harding

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MEASURING HETEROGENEITY IN PREGNANCY FRAMES Calculating neighborhood heterogeneity in pregnancy frames is complicated by the ordinal nature of the pregnancy frame measure, which makes the usual measure of variation for interval measures, the variance, inappropriate. I use an ordinal variation measure developed by Blair and Lacy (2000) that measures(More)
[Fe(qsal-Br)2]NO3·2MeOH is reported which undergoes abrupt two step symmetry breaking spin crossover, T½(1st step) = 136 K and T½(2nd step) = 232 K with a hysteresis of 16 K and 5 K, respectively, and an unprecedented [HS-LS] plateau of 96 K.
Solvent effects in a series of Fe(iii) spin crossover (SCO) complexes [Fe(qsal-I)2]OTf·sol (sol = MeOH 1, EtOH 2, n-PrOH 3, i-PrOH 4, acetone 5 and MeCN 6) are explored. SCO is abrupt in 1 (following MeOH loss) and 2, gradual for 3 (T1/2 = 199 K) and 4 (T1/2 = 251 K) and incomplete, even up to 350 K, for 5 and 6. In [Fe(qsal-I)2]OTf SCO occurs at T1/2↓ =(More)
The reaction of bis(1,3-diphenylpropane-1,3-dionato)cobalt(II), [Co(dbm)(2)], with bis(diphenylphosphino)ethane (dppe) affords the coordination polymer catena-poly[[bis(1,3-diphenylpropane-1,3-dionato-kappa(2)O,O')cobalt(II)]-mu-ethylenebis(diphenylphosphine oxide)-kappa(2)O:O'], trans-[Co(C(15)H(11)O(2))(2)(C(26)H(24)O(2)P(2))](n), as a result of oxidation(More)
The reaction of cobalt(II) acetate with potassium tris(pyrazolyl)borate (KTp(Ph2)) affords the title complex, [Co(Tp(Ph2))(O2CMe)(Hpz(Ph2))] (Hpz(Ph2) is 3,5-diphenylpyrazole) or [Co(C45H34BN6)(C2H3O2)(C15H12N2)], as a result of cobalt-induced B-N bond cleavage of the tris(pyrazolyl)borate ligand. The cobalt complex exhibits a distorted CoN(4)O coordination(More)
In the title complex, [Co(C(5)HF(6)O(2))(2)(C(12)H(9)BrN(2))], the Co(II) atom exhibits a pseudo-octa-hedral coordination geometry, comprising two N-donor atoms from a bidentate chelate (4-bromo-phen-yl)(2-pyridyl-methyl-idene)amine (ppa(Br)) ligand [Co-N = 2.098 (2) and 2.209 (2) Å] and four O-donor atoms from two bidentate chelate(More)
The reaction of Fe(NCS)3 prepared in situ in MeOH with Hqsal-X (Hqsal-X = 5-X-N-quinolylsalicylaldimine) in CH2Cl2 yields the FeIII complexes, [Fe(qsal-X)2]NCS·solvent (X = F 1; X = Cl, 2, Br, 3 solvent = MeOH; X = I, solvent = 0.25CH2Cl2·0.5MeOH 4) in moderate to good yields. IR spectroscopy confirms that NCS− acts as a counteranion only and that the(More)
The title compound, [Ni(C(5)HF(6)O(2))(2)(C(12)H(9)BrN(2))], the Ni(II) atom exhibits a pseudo-octa-hedral coordination geometry. The structure packs through C-H⋯Br inter-actions, forming a hydrogen-bonded ladder. There are also strong hydrogen-bonding inter-actions between two of the O atoms of the β-diketonate ligands and two H atoms on the pyridine ring(More)
A new synthesis of (8-quinolyl)-5-methoxysalicylaldimine (Hqsal-5-OMe) is reported and its crystal structure is presented. Two Fe(III) complexes, [Fe(qsal-5-OMe)(2)]Cl⋅solvent (solvent = 2 MeOH⋅0.5 H(2)O (1) and MeCN⋅H(2)O (2)) have been prepared and their structural, electronic and magnetic properties studied. [Fe(qsal-5-OMe)(2)]Cl⋅2 MeOH⋅0.5 H(2)O (1)(More)