Electronic structures of chromium(V) and manganese(V) in phosphate and vanadate hosts

Milstein, J.B.; Ackerman, John; Holt, S. L.; McGarvey, Bruce R.

doi:10.1021/ic50112a004

Cited by 65 publications

(19 citation statements)

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“…1 and 2. The sharpness of these bands, the characteristic presence of peak series, as well as the spectral range where they appear are similar to the spectroscopic features reported for tetrahedrally coordinated Cr(V) in Ca 2 (PO 4 ,CrO 4 )Cl and Ca 2 (VO 4 ,CrO 4 )Cl crystals [12,13]. This suggests that they can be ascribed to the 2 E 3 2 T 2 crystal field transition of Cr 5+ in tetrahedral coordination.…”

Section: Resultssupporting

confidence: 80%

Tetrahedral Cr4+ and Cr5+ in Bi12TiO20 Single Crystals

Егорышева

Волков

Coya

et al. 1998

phys. stat. sol. (b)

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Section: Resultssupporting

confidence: 80%

Tetrahedral Cr4+ and Cr5+ in Bi12TiO20 Single Crystals

Егорышева

Волков

Coya

et al. 1998

phys. stat. sol. (b)

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“…During early development of sturgeon culture in the USSR moist artificial rations were formulated using bone and blood meals, silk worms, and mineral and vitamin supplements (Gordienko et al 1970). Since such formulations were ineffective, the use of live organisms was adopted (Milstein 1972). Later attempts to utilize artificial rations also met with little success (Charlon & Williot 1978) and growout to market size was only possible using natural feeds (Suzuki & Nishi 1976, Romanycheva 1976.…”

Section: Feeding and Development Of Formulated Rationsmentioning

confidence: 99%

“…Currently Soviet hatcheries are dependent on a labor intensive industry to supply live feeds for sturgeon rearing (Milstein 1972). However, because of inadequate supplies and nutritional deficiencies that can result from their use it is not possible to grow the fish to market size.…”

Section: Introductionmentioning

confidence: 99%

Digestive and feeding characteristics of the chondrosteans

Buddington

Christofferson

1985

Environ Biol Fish

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SynopsisStructure and function of the digestive system and feeding characteristics of the chondrosteans are reviewed. Although the group exhibits a wide diversity of feeding habits including piscivory, benthophagy, and planktivory, they are principally carnivores throughout their life history. Examination of digestive system structure reveals the basic structure to be similar among the species with some modification to accomodate the different food types. For the species studied, composition of the adult digestive enzyme complement is consistent with the carnivorous habits with proteases dominating and only low levels of carbohydrase activity. There are three secretory phases during development of the digestive system. Each corresponds with different food habits of the different life-history intervals. Vis,ion is apparently not utilized for feeding in any interval. Instead food is recognized and located primarily by gustation, olfaction, textural qualities, and, possibly, electroreception.

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“…Resonance Raman studies of manganates(VII) and -(VI) have confirmed the CT origin of such transitions. 2,3 The presence of a CT band in the red spectral region was also proposed by Milstein et al 19 1 6 e 2 ! t 1 5 e 3 t 1 6 e 2 !…”

Section: Introductionmentioning

confidence: 53%

“…1 A 1 ), which confirms the tetrahedral geometry, since in this case these transitions are both spin and Laporte forbidden. Also on basis of their results on manganese(V) as a dopant in sites of lower symmetry such as spodiosite, Ca 2 PO 4 , MnO 4 Cl, 18,19 , the authors proposed an assignment for the Li 3 PO 4 , MnO 4 crystal which agrees with that of Kingsley et al 17 for the manganate(V) as a dopant in chlorapatite, Ca 5 PO 4 , MnO 4 Cl, in the sense that there is a CT transition in the visible region.…”

Section: Introductionmentioning

confidence: 99%

Electronic transitions of the manganate(V) ion in aqueous solution: a resonance Raman study

Noda

Ribeiro

Gonçalves

et al. 1999

J. Raman Spectrosc.

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The resonance Raman spectra of manganate(V) ion in aqueous solution in the visible and near-UV regions were studied. The maximum in the Raman excitation profile (REP) of the totally symmetric vibrational mode (n 1 ) at ca 600 nm is assigned to a charge-transfer transition with appreciable d-d character. Owing to marked orbital mixing in such systems, the observed Raman enhancement could also be assigned to a d-d transition with a high charge-transfer character. The absence of overtones in the Raman spectrum indicates a small shift in the equilibrium Mn-O bond distances (d r ) between the excited and fundamental electronic states. This finding was confirmed by the calculation of the REP within the time formalism approach. The best fitted d r value is lower than the corresponding reported values for manganate(VII) and manganate(VI) ions. Two models were used in the calculations, in which whether a single or two electronic transitions were considered in the visible range of the absorption spectrum. Similar d r values were obtained with both models.

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Electronic structures of chromium(V) and manganese(V) in phosphate and vanadate hosts

Cited by 65 publications

References 0 publications

Tetrahedral Cr4+ and Cr5+ in Bi12TiO20 Single Crystals

Tetrahedral Cr4+ and Cr5+ in Bi12TiO20 Single Crystals

Digestive and feeding characteristics of the chondrosteans

Electronic transitions of the manganate(V) ion in aqueous solution: a resonance Raman study

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