Reaction of 2,2':6',2''-terpyridyl
(tpy) with ruthenium dicarbonyl
dihalides yields the complexes Ru(CO)2X2(tpy) (X = Br or Cl), which can be protonated
giving [Ru(CO)2X2(tpyH)]ClO4. Crystal structures of the two forms
(red and yellow) of Ru(CO)2Br2(tpy) show each to have octahedral stereo-chemistry with cis-carbonyls, trans-bromines, and bidentate tpy.
Treatment of Ru(CO)2X2(tpy) complexes with trimethylamine
N-oxide in dichloromethane at room temperature gives cis-Ru(CO)X2(tpy) complexes. The presence of cis halogens and tridentate terpyridyl in
the chloro complex has been established by X-ray
crystallography. Reaction of terpyridyl with
ruthenium trichloride in dimethylformamide
yields trans-Ru(CO)Cl2(tpy), the crystal structure of which has been determined.
Cardiovascular disease is the leading cause of death in developed nations, and there is a clear link with physical inactivity. The benefits of resistance training in patients with coronary heart disease are well documented and can contribute to secondary prevention of heart disease with corresponding improvements in patient survival. This review describes the benefits of resistance exercise for cardiac patients, details of its prescription in this group, and considers safety and contraindications.
Recrystallization of lead(II) halides, PbX2 (X = C1, Br, I), from n- methylpyridine, n = 3, 4, yields crystalline 1 : 2 adducts; these have all been shown by single-crystal X-ray structure determination to contain the lead in an essentially octahedral six-coordinate environment, two of the coordination sites being occupied by monodentate pyridine base moieties and four by bridging halogen, yielding infinite polymeric arrays. For X = Cl, Br, n = 3, the nitrogen atoms lie cis in the coordination sphere; for the other complexes, they are trans. In the two cis complexes, distortion from ideal orthogonal geometry is more substantial than in the trans, possibly indicative of the presence of a sterically active 'lone pair'.
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