Crystal and molecular structure of manganese(II) lapacholate, a novel polymeric species undergoing temperature-reversible metal to ligand electron transfer.

Lapachol (2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphtoquinone) (HLap, C(15)H(14)O(3)) reacts with Mn(2+) producing a novel polymeric complex with formula: [Mn(Lap)(2)](n). Two ligands chelate the metal through their ortho oxygen (O1, O2) moiety while two para oxygens, from other Lap ligands, complete the octahedral coordination sphere. Thus far, all reported Lap metal complexes are mononuclear, lack the metal-trans-quinonic (para) oxygen binding and have Lap as a bidentate ligand.

The structure of the FeNO group in two metastable states (MS1 and MS2) of the nitroprusside anion in Na2[Fe(CN)5NO].2H2O. Infrared spectra and quantum chemistry calculations for the normal and the 15NO and N18O isotopic substituted substance.

Low temperature infrared spectra of light induced metastable states MS1 and MS2 of the nitroprusside anion in Na(2)[Fe(CN)(5)NO].2H(2)O, isotopically normal and substituted with (15)NO and N(18)O, are presented and discussed. As a consequence of the relatively high population of the MS2 state achieved by further irradiation with 1064 nm light of samples previously irradiated with 488.