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How Do Stomata Sense Reductions in Atmospheric Relative Humidity？

Molecular Plant 2013年第5期6卷 1703-1706页

作者： hubert bauer Peter Ache Florian Wohlfart Khaled A.S. Al-Rasheid Sophia Sonnewald Uwe Sonnewald Susanne Kneitz Alistair M. Hetherington Rainer Hedrich Julius-von-Sachs-Institut fur Biowissenschaften Biozentrum University of Wurzburg D-97082 Wurzburg Germany College of Science King Saud University Riyadh 11451 Saudi Arabia Department of Biology Friedrich-Alexander-University Erlangen- Nuremberg 91058 Erlangen Germany Theodor-Boveri-Institute of Biosciences University of Wurzburg D-97074 Wurzburg Germany School of Biological Sciences University of Bristol Bristol BS8 1UG UK

Dear Editor, It has been known since the work of Francis Darwin that, in response to a reduction in atmospheric relative humidity （rh）, stomatal aperture decreases. Screening for Arabidopsis mutants compromised in stomatal responses to reduced rh resulted in the identification of two genes, OST1 and ABA2, that are involved in stomatal response to low rh conditions. Interestingly both encode proteins previously known to be involved in ABA signaling （Xie et al., 2006, and references therein）. These findings strongly suggested that, at least in part, the stomatal response to low rh is mediated by ABA and the intracellular ABA signaling pathway. Our most recent data show that low rh-induced stomatal closure can pro- ceed by guard cell autonomous ABA synthesis （bauer et al., 2013）,

关键词： ABA signaling regulate SLAC1 ABA signaling pathway

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An inverted triplesalen ligand by a convergent synthesis and its influence on trinuclear Fe_3~Ⅲ complexes

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Science China Chemistry 2012年第6期55卷 951-966页

作者： FELDSCHER Bastian KRICKEMEYER Erich MOSELAGE Marc THEIL hubert HOEKE Veronika KAISER Yvonne STAMMLER Anja BGGE Hartmut GLASER Thorsten Lehrstuhl für Anorganische Chemie I Fakultt für Chemie Universitt Bielefeld Universittsstr. 25 D-33615 Bielefeld Germany

The inverted triplesalen ligand H6feldMe has been synthesized from 2,4,6-triformyl-phloroglucinol and a ketimine salen half-unit in a convergent synthesis. NMR, IR, and UV-vis spectroscopy reveal that this ligand is not in the O-protonated tau- tomer but in the N-protonated tautomer with substantial heteroradialene contribution. This ligand and the conventional triple- salen ligand H6talent-au2 have been used to synthesize the trinuclear Fem complexes [（feldMe）（FeCl）3] and [（talent-Bu2）（FeC1）3], respectively. The molecular structures of these complexes were obtained by single-crystal X-ray diffraction. Two trinuclear Fem complexes of [（feldMe）（FeCl）3] dimerize via two Fe-phenolate bonds, whereas due to steric hindrance no dimerization is observed for [（talent-Bu2）（FeC1）3]. The structural data also reveal some heteroradialene contribution in the trinuclear complexes. Whereas UV-vis and MOlSbauer spectroscopy are not suitable to distinguish between the two complexes, FT-IR spectra show characteristic features due to the different substitution patterns of the conventional and the inverted triplesalen ligands. Another handle is provided by electrochemistry. Whereas both complexes exhibit an irreversible oxidation wave （0.94 V vs. Fc＋/Fc for [（feldMe）（FeC1）3] and 0.84 V vs. Fc~/Fc for [（talent-Bu2）（FeC1）3]）, which is assigned to the oxidation of the central backbone, higher potential oxidations are reversible for [（talent-Bu2）（FeC1）3]） but irreversible for [（feldMe）（FeC1）3]. This is attributed to the reversible oxidation of the terminal phenolates in the di-tert-butyl substituted [（talentBu2）（FeCl）3] in contrast to the mono-methyl-substituted phenolates in [（feld^ae）（FeC1）3]. The magnetic properties of [（talen^-Bu2）（FeC1）3] reveal a very small ferromagnetic coupling with significant zero-field splitting of the Feul S = 5/2 ions. In contrast, the dimerization of two trinu- clear complexes in [（feldMe）（FeCl）3] results in antiferromagnetic interactions between the two pheno

关键词： magnetic properties iron complexes spin-polarization triplesalen

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An inverted triplesalen ligand by a convergent synthesis and its influence on trinuclear FeXII3 complexes

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中国科学：化学 2012年第6期42卷 897-900页

作者： Bastian FELDSCHER Erich KRICKEMEYER Marc MOSELAGE hubert THEIL Veronika HOEKE Yvonne KAISER Anja STAMMLER Hartmut BGGE Thorsten GLASER Lehrstuhl f黵 Anorganische Chemie I Fakult鋞 f黵 Chemie Universit鋞 Bielefeld Universit鋞sstr. 25 D-33615 Bielefeld Germany

The inverted triplesalen ligand H6feldMehas been synthesized from 2,4,6-triformyl-phloroglucinol and a ketimine salen half-unit in a convergent synthesis. NMR, IR, and UV-vis spectroscopy reveal that this ligand is not in the O-protonated tautomer but in the N-protonated tautomer with substantial heteroradialene contribution. This ligand and the conventional triplesalen ligand H6talent-Bu2 have been used to synthesize the trinuclear FeⅢcomplexes [(feldMe)(FeCl)3] and [(talent-Bu2)(FeCl)3], respectively. The molecular structures of these complexes were obtained by single-crystal X-ray diffraction. Two trinuclear FeⅢcomplexes of [(feldMe)(FeCl)3] dimerize via two Fe-phenolate bonds, whereas due to steric hindrance no dimerization is observed for [(talent-Bu2)(FeCl)3]. The structural data also reveal some heteroradialene contribution in the trinuclear complexes. Whereas UV-vis and M??bauer spectroscopy are not suitable to distinguish between the two complexes, FT-IR spectra show characteristic features due to the different substitution patterns of the conventional and the inverted triplesalen ligands. Another handle is provided by electrochemistry. Whereas both complexes exhibit an irreversible oxidation wave (0.94 V vs. Fc+/Fc for [(feldMe)(FeCl)3] and 0.84 V vs. Fc+/Fc for [(talent-Bu2)(FeCl)3]), which is assigned to the oxidation of the central backbone, higher potential oxidations are reversible for [(talent-Bu2)(FeCl)3]) but irreversible for [(feldMe)(FeCl)3]. This is attributed to the reversible oxidation of the terminal phenolates in the di-tert-butyl substituted [(talent-Bu2)(FeCl)3] in contrast to the mono-methyl-substituted phenolates in [(feldMe)(FeCl)3]. The magnetic properties of [(talent-Bu2)(FeCl)3] reveal a very small ferromagnetic coupling with significant zero-field splitting of the FeⅢS = 5/2 ions. In contrast, the dimerization of two trinuclear complexes in [(feldMe)(FeCl)3] results in antiferromagnetic interactions between the two phenolate-bridged

关键词：三核配合物合成收敛反铁磁相互作用复合物单晶X-射线衍射紫外可见光谱铁配合物

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