Showing papers by "Heinz Gornitzka published in 1999"
TL;DR: In this article, a chiral cyanine dye, 4'-[methoxymethyl)pyrrolidinyl]-1-methylstilbazolium iodide (MPMS+I-) is reported.
Abstract: A new chiral cyanine dye, 4‘-[2-(methoxymethyl)pyrrolidinyl]-1-methylstilbazolium iodide (MPMS+I-) is reported. It crystallizes in the monoclinic P21 space group. a = 16.559(2) A, b = 6.263(1) A, c = 24.477(3) A, β = 109.20(1)°, Z = 2. The hyperpolarizability of MPMS+I- is compared versus that of 4‘-dimethylamino-1-methylstilbazolium iodide (DAMS+I-). MPMS+I- is phase matchable and exhibits an efficiency up to 80 times that of urea in second-harmonic generation (SHG). Both compounds (C+I-) react with tetracyanoquinodimethane (TCNQ), and the resulting C+(TCNQ2)- exhibit conductivities in the range 10-3−10-2 S cm-1. The possibility of combining conductivity and optical nonlinearities is discussed.
36 citations
TL;DR: The fragility of the benzylic C−H bonds of bis[di(2-pyridyl)methyl]amine (bdpma) has been demonstrated by a detailed crystallographic study of the wide variety of compounds obtained with the tetrapyridine ligand and manganese, iron, and cobalt salts as mentioned in this paper.
Abstract: The fragility of the benzylic C−H bonds of bis[di(2-pyridyl)methyl]amine (bdpma) has been demonstrated by a detailed crystallographic study of the wide variety of compounds obtained with the tetrapyridyl ligand and manganese, iron, and cobalt salts (figure).
36 citations
TL;DR: The first crystallographically characterized phosphonium yldiide 2 was obtained in a simple reaction by addition of n-butyllithium to the stable phosphanyl(silyl)carbene 1.
Abstract: The first crystallographically characterized phosphonium yldiide 2 was obtained in a simple reaction by addition of n-butyllithium to the stable phosphanyl(silyl)carbene 1. R=cHex2 N.
35 citations
TL;DR: Das erste Phosphonium-Yldiid, das kristallographisch charakterisiert wurde, 2, wurd in einer einfachen Reaktion durch Addition von n-Butyllithium an das stabile Phosphanyl(silyl)carben 1 erhalten as mentioned in this paper.
Abstract: Das erste Phosphonium-Yldiid, das kristallographisch charakterisiert wurde, 2, wurde in einer einfachen Reaktion durch Addition von n-Butyllithium an das stabile Phosphanyl(silyl)carben 1 erhalten. R=cHex2N.
5 citations
TL;DR: In this paper, the existence of a faible coordination intramoleculaire d'un groupement methoxyle sur le silicium was demontree par RMN du 1H.
Abstract: Resume De nouveaux (8-methoxynaphtyl)silanes ont ete prepares par voie organometallique. L'existence d'une faible coordination intramoleculaire d'un groupement methoxyle sur le silicium a ete demontree par RMN du 1H. L'action de l'acide triflique conduit aux organosilyl triflates qui presentent un silicium pentacoordonne et une forte polarisation de la liaison silicium-oxygene (triflate). Des mesures de conductivite confirment le caractere ionique de ces structures. En revanche, la formation inattendue de silaoxolenes a ete observee en presence d'iode, de Et3N ou Bu3P. Des reactions d'hydrolyse permettent d'acceder selectivement, suivant les conditions operatoires utilisees (1/2 equiv ou exces d'eau) a des siloxanes fonctionnels a groupement hydrure ou triflate. Une etude par diffraction de rayons X de l'organosiloxytriflate confirme la faible complexation du ligand sur le metal.