Coordination Chemistry of Macrocyclic Compounds by Gordon A. Melson (auth.), Gordon A. Melson (eds.)

By Gordon A. Melson (auth.), Gordon A. Melson (eds.)

Chemists were conscious of the lifestyles of coordination compounds con­ taining natural macrocyclic ligands because the first a part of this century ; even if, basically prior to now few years have they accelerated examine into the chemistry of those compounds. the growth was once initiated within the early Sixties by means of the synthesis and characterization of compounds containing a few new macrocyclic ligands. The synthesis of compounds that can function version platforms for a few common items containing huge earrings as ligands supplied the most objective for the early enlargement of analysis attempt; certainly, a recurrent subject matter in the back of a lot of the mentioned chemistry has been the analogy among artificial macrocyclic compounds and plenty of natural-product platforms. extra lately, the emphases of mentioned examine have ranged over the full spectrum of chemistry, and the variety of guides that debate macrocyclic chemistry has elevated at a dramatic price. the finished study has been suggested in quite a few journals through the global yet there was no prior try to convey the foremost advancements jointly less than one disguise. This booklet, for that reason, makes an attempt to meet the necessity for a unmarried resource during which there's either a suite and a correlation of data in regards to the coordination chemistry of macrocyclic compounds. The chapters during this booklet talk about a variety of points of macrocyclic chemistry, and whereas those chapters as an entire represent an in-depth survey of the state-of­ the-art of the sector, each one bankruptcy is written as a whole unit.

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The 42 Gordon A. Melson bromide and iodide derivatives are not binuclear species, although the monomeric complexes [Cu(rac-(5,12)-Mes[14]aneN4)X]CI04 (X = Br, I) are obtained. The binuclear chloro complex has been shown to contain the ligand in a folded form. A variety of other complexes containing the Mes[14]aneN4 ligands have been synthesized. 102) The physical properties of the complexes indicate that the nickel(II) ion is six coordinated in all the species. With the exception of the acetylacetonate derivative, the ms-(5,12)Mes[14]aneN4 macrocyclic ligand is coordinated in a planar manner with the anions in trans positions (in [Ni(ms-(5,12)-Mes[14]aneN4)acac]CI04, the ligand folds to accommodate the acetylacetonate ion(151».

4H2O COL(NCS)2 NiL(NCS)2 COL(NCS)2 [CoLBr)CI2 NiL(NCS)2 NiL(NCS)2 [NiLCI)CIO. ),,· 5HIIO COL(NCS)2 61 62 62 62 62 62 62 62 63 63 63 63 63 64 61 64 64 64 64 64 64 65 64 65 61 65 64 64 64 65 64 64 65 64 64 64 64 65 ctNItinued overleqf 26 Gordon A. Melson TABLE 1 (continued) Name I m n ([13]ane-l,5,9-Na) 3 3 4 ([14]ane-l,5,9-Ns) ([15]ane-l,5,9-Ns) 3 3 3 3 5 6 Complex NiL(NCS)2 [NiLCI]CIO& COL(NCS)2 NiL(NCS)2 NiL(NCS)2 COL(NCS)2 " I-tmOH = 2,3-diamino-l-propanol; 2-tmOH Reference 64 64 65 64 64 65 = l,3-diamino-2-propanol.

Mter filtration, a stream of O2 was passed through the filtrate for 24 hr and methanol was allowed to evaporate. Treatment of the red glassy residue with concentrated HCI results in the formation of green crystals. Recrystallization from methanol produces two distinctly different kinds of crystal, dark green plates, approximately 20%, isomer a, and fine green needles, isomer b. Isomer a is less soluble than isomer b in methanol, and the isomeric products can be readily separated by fractional crystallization from MeOH.

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