Search Results

You are looking at 1 - 10 of 950 items for :

  • "coordination" x
Clear All

Molle, W. (2009): European policies for innovation and cohesion; from loose coordination to partial integration. In: Molle, W. — Djarova, J. (eds): Enhancing the Effectiveness of Innovation Policy; New Roles for Key Players . Cheltenham: Edward

Restricted access

Thermoanalytical studies of imidazole-substituted coordination compounds

Mn(II)-complexes of bis(1-methylimidazol-2-yl)ketone

Journal of Thermal Analysis and Calorimetry
Authors: S. Materazzi, S. Vecchio, L. W. Wo and Curtis S. De Angelis

Introduction Manganese(II) coordination compounds with nitrogen donor ligands like substituted imidazoles have been thoroughly investigated during the past years. These compounds can be good models to simulate several

Restricted access

Morin, D., Viala, D. (2002) Coordination of locomotor and respiratory rhythms in vitro are critically dependent on hindlimb sensory inputs. J. Neurosci. 22 , 4756-4765. Coordination

Restricted access

Thermal latent coordination compounds

II. The thermal degradation of imidazole and pyrazole adducts of metal(II) picolinate and quinaldinate

Journal of Thermal Analysis and Calorimetry
Authors: M. Döring, J. Wuckelt, W. Ludwig and H. Görls

Abstract  

Complexes of the type M(Pa)2(HAz)2 and M(QA)2(HAz)2 (M=cobalt(II) and nickel(II); HPa=picolinic acid, HQa=quinaldic acid; HAz=azoles like imidazole (Him), pyrazole (HPz), benzimidazole (HBzIm) etc.) show a similar thermal behaviour. In the first step of decomposition the corresponding azolinium picolinates or quinaldinates (H2AzPa, H2AzQa) are split off with formation of polymeric mixed ligand complexes M(Pa)(Az) or M(Qa)(Az). X-ray analysis of Co(Qa)2(HBzIm)2 XIIIa illustrates a proton transfer and a subsequent thermal removal of benzimidazolinium quinaldinate (H2BzImQa): Hydrogen bridges from pyrrole nitrogen of the benzimidazole to the non-coordinated oxygen of the quinaldinate predetermine the thermal initiated proton transfer. The high volatility of the heterocyclic acids and the nitrogen coordination are responsible for the formation of the mixed ligand complex Co(Qa)(BzIm) XIVa. Exceptions are the complexes M(Pa)2(HPz)2 XIa-b and M(Qa)2(HIm)2 XVIIa-b. Pyrazole is eliminated from the complexes XIa-b with formation of the solvent-free inner complex M(Pa)2 XIIa-b. From compounds XVIIIa-b quinaldic acid or their decomposition products are split off and a high temperature modification of M(Im)2 XVIIIa-b is formed at elevated temperature. XVIIIa-b are decomposed to the cyanides M(CN)2 similarly to the thermal behaviour of Cu(Im). In the first step the thermal degradation of imidazole and pyrazole adducts of copper(II) picolinates and quinaldinates is characterized by the elimination of azoles. The reason for this thermal behaviour is the weaker coordination of the azole heterocycles in copper chelate compounds.

Restricted access

Dyakonova, T. L., Dyakonova, V. E. (2008) Possible involvement of nitric oxide in coordination of buccal feeding rhythm and gut motility in Lymnaea stagnalis . Acta Biol. Hung. 59 , 33–37. Dyakonova V. E

Restricted access

társadalmi koordinációs mechanizmusok és a közszféra” [Social Co-ordinations Mechanisms and the Public Sector]. Pénzügyi Szemle 52(3–4). Chikán, A. (2008): Vállalatgazdaságtan [Business Economics]. Budapest

Restricted access

Acocella, N. — di Bartolomeo, G. (2004a): Is a Conservative Central Banker a (Perfect) Substitute for Wage Coordination? Empirica , 31: 281–294. Bartolomeo G. Is a Conservative

Restricted access

T. , Šulek P. Impact of genetic algorithm parameters on optimization of hydrothermal coordination , Pollack Periodica , Vol. 11 , No. 2 , 2016 , pp. 113 – 123 . [4

Restricted access

] Zoumas C. E. , Bakirtzis A. G. , Theocharis J. B. , Petridis V. A genetic algorithm solution approach to the hydrothermal coordination problem , IEEE Trans Power Syst , Vol. 19 , No. 2 , 2004 , pp. 1356

Restricted access

. The coordination via pyridinic N atom was clearly detected in the IR spectra of 1 – 4 by the shift of the absorption band attributed to the ring breathing vibrational mode (Φ) to higher frequency (ca. 1062 cm −1 ) when compared to that one of the

Restricted access