bluuebunny/crossref_metadata_2025_split huggingface dataset:
The origin of the diversity of leaf venation pattern
Authors: Fujita Hironori , Mochizuki Atsushi 
Published: August 2006

AbstractThe leaf venation pattern of plants shows remarkable diversity and species‐specificity. However, the mechanism underlying the pattern formation and pattern diversity remains unclear. We developed a mathematical model that is based on the positive feedback regulation between plant hormone auxin and its efflux carrier. This system can generate auxin flow pathways by self‐organization from an almost homogeneous state. This result explains a well‐known experimental phenomenon referred as to “polar auxin transport.” The model can produce diverse leaf venation patterns with spatial regularity under similar conditions to those of leaf development, that is, in the presence of leaf expansion and auxin sink. Final venation patterns are strikingly affected by leaf shape and leaf expansion. These results indicate that the positive feedback regulation between auxin and its efflux carrier is a central dynamic in leaf venation pattern formation. The diversity of leaf venation patterns in plant species is probably due to the differences of leaf shape and leaf expansion pattern. Developmental Dynamics 235:2710–2721, 2006. © 2006 Wiley‐Liss, Inc.
Expression analysis of IGFBP‐rP10, IGFBP‐like and Mig30 in early Xenopus development
Authors: Kuerner Klaus‐Michael , Steinbeisser Herbert 
Published: August 2006

AbstractTo date, five members of the insulin‐like growth factor‐binding protein (IGFBP) superfamily have been described in Xenopus laevis. Here, we report the isolation of two new IGFBPs: xIGFBP‐rP10, and xIGFBP‐like. The proteins share the same domain architecture, and together with Mig30, form a subgroup within the IGFBP superfamily. Temporal expression analysis shows that they are expressed differentially during early development. xIGFBP‐rP10 is continuously expressed, whereas Mig30 expression peaks during gastrulation. IGFBP‐like is expressed from neurulation onward. The three genes have characteristic spatial expression domains, which overlap in some regions. Both xIGFBP‐rP10 and Mig30 are expressed on the dorsal side of the embryo during gastrulation. Later, xIGFBP‐rP10 is expressed in the notochord, the floor plate, the somites, and the fin. xIGFBP‐like expression is seen primarily in the developing central nervous system and overlaps with Mig30 expression at the end of neurulation in the developing somites and in tail bud stages in the eyes. Developmental Dynamics 235:2861–2867, 2006. © 2006 Wiley‐Liss, Inc.
Critical role of Brg1 member of the SWI/SNF chromatin remodeling complex during neurogenesis and neural crest induction in zebrafish
Authors: Eroglu Binnur , Wang Guanghu , Tu Naxin , Sun Xutong , Mivechi Nahid F. 
Published: August 2006

AbstractBrg1 is a member of the SWI/SNF chromatin‐remodeling complex, and in some organisms Brg1 has been shown to interact with β‐catenin and positively control the TCF/LEF transcription factor that is located downstream of the Wnt signal transduction pathway. During development, TCF/LEF activity is critical during neurogenesis and head induction. In zebrafish, Brg1‐deficient embryos exhibit retinal cell differentiation and eye defects; however, the role of Brg1 in neurogenesis and neural crest cell induction remains elusive. We used zebrafish deficient in Brg1 (yng) or Brg1 specific‐morpholino oligonucleotide‐mediated knockdown to analyze the embryonic requirements of Brg1. Our results indicate that reduction in Brg1 expression leads to the expansion of the forebrain‐specific transcription factor, six3, and marked reduction in expression of the mid/hind‐brain boundary and hind‐brain genes, engrailed2 and krox20, respectively. At 12 hpf, the expression of neural crest specifiers are severely affected in Brg1‐morpholino‐injected embryos. These results suggest that Brg1 is involved in neural crest induction, which is critical for the development of neurons, glia, pigment cells, and craniofacial structures. Brg1 is a maternal factor, and brg1‐deficient embryos bearing the yng mutation derived from heterozygote intercrosses exhibit lesser effects on neural crest–specific gene expression, but show defects in neurogenesis and neural crest cell differentiation. This is exhibited by the aberrant brain patterning, a reduction in the sensory neurons, and craniofacial defects. These results further elucidate the critical role for Brg1 in neurogenesis, neural crest induction, and differentiation. Developmental Dynamics 235:2722–2735, 2006. © 2006 Wiley‐Liss, Inc.
Analysis of axis induction mutant embryos reveals morphogenetic events associated with zebrafish yolk extension formation
Authors: Lyman Gingerich Jamie , Lindeman Robin , Putiri Emily , Stolzmann Kelly , Pelegri Francisco 
Published: August 2006

AbstractWe analyze patterning and morphogenetic events during somitogenesis in hecate mutant embryos, which exhibit early axis induction defects. The posterior region, in the absence of a dorsal axis, is capable of forming organized gene expression patterns. The aberrant morphogenesis of mutant embryos is associated with anteriorly directed cell movements, underlying the enveloping layer, from the posterior region. In both wild‐type and mutant embryos, these changes result in an accumulation of cells, whose location correlates with a constriction in the posterior yolk cell, which in the wild‐type corresponds to the yolk extension. The region encompassing the constriction corresponds to a region of expression of zangptl2 in the yolk syncytial layer, which expands anteriorly together with the anteriorly migrating tail bud–derived cell population. Our data indicate that yolk extension formation is associated with coordinated changes involving the anterior migration of cells from the posterior region, changes in surface cellular layers, and inductive gene expression events in the YSL. Developmental Dynamics 235:2749–2760, 2006. © 2006 Wiley‐Liss, Inc.
Lineage specification in neural crest cell pathfinding
Authors: Harris Melissa L. , Erickson Carol A. 
Published: August 2006

AbstractThere are two principal models to explain neural crest patterning. One assumes that neural crest cells are multipotent precursors that migrate throughout the embryo and differentiate according to cues present in the local environment. A second proposes that the neural crest is a population of cells that becomes restricted to particular fates early in its existence and migrates along particular pathways dependent on unique cell‐autonomous properties. Although it is now evident that the neural crest cell population, as a whole, is actually heterogenous (composed of both multipotent and restricted progenitors), evidence supporting the model of prespecification has increased over the past few years. This review will begin by telling the story of melanoblasts: a neural crest subpopulation that is biased toward a single fate and subsequently acquires intrinsic properties that guide cells of this lineage to their final destination. The remainder of this review will explore whether this model is exclusive to melanoblasts or if it can also be used to explain the patterning of other neural crest cells like those of the sensory, sympathoadrenal, and enteric lineages. Developmental Dynamics 236:1–19, 2007. © 2006 Wiley‐Liss, Inc.
Three‐dimensional slice cultures from murine fetal gut for investigations of the enteric nervous system
Authors: Metzger Marco , Bareiss Petra M. , Nikolov Ivan , Skutella Thomas , Just Lothar 
Published: August 2006

AbstractThree‐dimensional intestinal cultures offer new possibilities for the examination of growth potential, analysis of time specific gene expression, and spatial cellular arrangement of enteric nervous system in an organotypical environment. We present an easy to produce in vitro model of the enteric nervous system for analysis and manipulation of cellular differentiation processes. Slice cultures of murine fetal colon were cultured on membrane inserts for up to 2 weeks without loss of autonomous contractility. After slice preparation, cultured tissue reorganized within the first days in vitro. Afterward, the culture possessed more than 35 cell layers, including high prismatic epithelial cells, smooth muscle cells, glial cells, and neurons analyzed by immunohistochemistry. The contraction frequency of intestinal slice culture could be modulated by the neurotransmitter serotonin and the sodium channel blocker tetrodotoxin. Coculture experiments with cultured neurospheres isolated from enhanced green fluorescent protein (eGFP) transgenic mice demonstrated that differentiating eGFP‐positive neurons were integrated into the intestinal tissue culture. This slice culture model of enteric nervous system proved to be useful for studying cell–cell interactions, cellular signaling, and cell differentiation processes in a three‐dimensional cell arrangement. Developmental Dynamics 236:128–133, 2007. © 2006 Wiley‐Liss, Inc.
MEKK4 regulates developmental EMT in the embryonic heart
Authors: Stevens Mark V. , Parker Patti , Vaillancourt Richard R. , Camenisch Todd D. 
Published: August 2006

AbstractCongenital heart malformations occur at a rate of one per one hundred births and are considered the most frequent birth defects. This high incidence of cardiac defects underscores the complex developmental processes required to form the first functioning organ in mammals. The molecular cues which govern heart development are poorly defined and require an improved understanding in order to advance repair strategies for heart defects. The cytoplasmic MAP kinase kinase kinase, MEKK4, is a critical effector in cellular stress responses; however, the function of MEKK4 during embryonic development and cardiogenesis is not well understood. We have identified MEKK4 as a critical signaling molecule during cardiovascular development. We report the detection of MEKK4 transcripts to early myocardium, endocardium and to cardiac cushion cells that have executed epithelial to mesenchymal transformation (EMT). These observations suggest that MEKK4 may function during production of the cushion mesenchyme as required to create valves and the septated heart. We used a kinase inactive form of MEKK4(MEKK4KI) in an in vitro assay that recapitulates in vivo EMT, and show that MEKK4KI attenuates mesenchyme production. However, addition of a constitutively active MEKK4 into ventricular explants, a system that does not normally undergo EMT, is not able to cause mesenchymal cell outgrowth. Thus, the kinase activity of MEKK4 is essential, but not sufficient, to support developmental EMT. This knowledge provides a basis to understand how MEKK4 may integrate signaling cascades controlling heart development. Developmental Dynamics 235:2761–2770, 2006. © 2006 Wiley‐Liss, Inc.
Chiral Platinum(II) Compounds Containing Ferrocenyl Schiff Bases Acting as (N), (N,O)–, [C(sp2,ferrocene),N]– or [C(sp2,ferrocene),N,O]2– Ligands
Authors: López Concepción , Caubet Amparo , Pérez Sonia , Solans Xavier , Font‐Bardía Mercè , Molins Elies 
Published: August 2006

AbstractA study of the reactions of the following ferrocenyl Schiff bases: (SC)‐(+)‐[FcCH=NCH(R1)CH2OH] {Fc = (η5‐C5H5)Fe(η5‐C5H4), R1 = Me (1a) or CHMe2 (1b)} with cis‐[PtCl2(dmso)2] under different experimental conditions is reported. This study enabled the isolation and characterisation of the enantiomerically pure platinum(II) complexes trans‐(SC)‐[Pt{FcCH=NCH(R1)CH2OH}Cl2(dmso)] {R1 = Me (2a)or CHMe2 (2b)} and cis‐(SC)‐[Pt{FcCH=NCH(R1)CH2OH}Cl2(dmso)] {R1 = Me (3a) or CHMe2 (3b)} as well as four isomeric forms of (SC)‐[Pt{FcCH=N–CH(R1)CH2O}Cl(dmso)] {R1 = Me or CHMe2} (4–7a,b). These isomers differ in the conformation of the imine {anti‐(E) (in 4 and 6) or syn‐(Z) (in 5 and 7)} or in the relative arrangement of the nitrogen and the dmso group {trans (in 4 and 5) or cis (in 6 and 7)}. Imines 1 behave as a N‐donor ligand in 2 and 3 and as a (N,O)– group in 4–7. We also prepared the diastereomers {(Sp,SC) and (Rp,SC)} of the platinacycles [Pt{[(η5‐C5H3)CH=NCH(R1)CH2OH]Fe(η5‐C5H5)}Cl(dmso)] {8 and 9; R1 = Me (Sp,SC) (8a) and (Rp,SC) (9a) or R1 = CHMe2 (Sp,SC) (8b) and (Rp,SC) (9b)}, [Pt{[(η5‐C5H3)CH=NCH(R1)CH2O]Fe(η5‐C5H5)}(dmso)] {10 and 11; R1 = Me (Sp,SC) (10a) and (Rp,SC) (11a) or R1 = CHMe2 (Sp,SC) (10b) and (Rp,SC) (11b)} and [Pt{[(η5‐C5H3)CH=NCH(R1)CH2OH]Fe(η5‐C5H5)}Cl(PPh3)] {12 and 13; R1 = Me (Sp,SC) (12a) and (Rp,SC) (13a) or R1 = CHMe2 (Sp,SC) (12b) and (Rp,SC) (13b)}, containing a [C(sp2,ferrocene),N]– (in 8, 9, 12 and 13) or a [C(sp2,ferrocene),N,O]2– (in 10 and 11) group. The X‐ray crystal structures of 1b·H2O, 3b, 7b·CH2Cl2·1/2H2O and 9a are also reported. Our study allows the elucidation of the factors affecting the preferential formation of a given platinum(II) complex. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Synthesis, Characterization, and Luminescence Properties of Eu3+ 3‐Phenyl‐4‐(4‐toluoyl)‐5‐isoxazolonate Based Organic‐Inorganic Hybrids
Authors: Lima Patricia P. , Junior Severino A. , Malta Oscar L. , Carlos Luis D. , Sá Ferreira Rute A. , Pavithran Rani , Reddy M. L. P. 
Published: August 2006

AbstractOrganic‐inorganic hybrids incorporating Eu(TPI)3·3H2O or Eu(TPI)3·2TOPO [where TPI and TOPO stand for 3‐phenyl‐4‐(4‐toluoyl)‐5‐isoxazolone and tri‐n‐octylphosphane oxide, respectively] were synthesized either by acetic acid solvolysis or a conventional hydrolysis sol‐gel route. The host framework of these materials, named as di‐ureasil, consists of a siliceous skeleton grafted, through urea cross‐linkages, to both ends of poly(ethylene oxide) chains. The resulting Eu3+‐based di‐ureasils were characterized by X‐ray diffraction and Fourier transform mid‐IR, 29Si and 13C NMR, and photoluminescence spectroscopy. The room‐temperature photoluminescence (PL) spectra of the Eu3+‐based di‐ureasils display the typical Eu3+ red emission, assigned to transitions between the first excited state (5D0) and the ground multiplet (7F0–4). Enhanced 5D0 quantum efficiency (η = 13 % vs. 32 %) and a longer lifetime (τ = 0.30 vs. 0.42 ms) was noticed for the hybrid incorporating the Eu(TPI)3·3H2O complex, compared with the undoped complex. The enhancement is explained by the coordination ability of the organic counter part of the host structure, which is strong enough to displace the water molecules of the Eu(TPI)3·3H2O complex from the Eu3+ neighborhood in the hybrids. On the other hand, a decrease in the 5D0 quantum efficiency (η = 76 % vs. 61 %) and lifetime (τ = 0.98 vs. 0.75 ms) was noticed for the hybrid incorporating the Eu(TPI)3·2TOPO complex, relative to the undoped complex, probably because of an increase in the nonradiative transition probability. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Syntheses, Structures and Near‐IR Luminescent Studies on Ternary Lanthanide (ErIII, HoIII, YbIII, NdIII) Complexes Containing 4,4,5,5,6,6,6‐Heptafluoro‐1‐(2‐thienyl)hexane‐1,3‐dionate
Authors: Sun Li‐Ning , Yu Jiang‐Bo , Zheng Guo‐Li , Zhang Hong‐Jie , Meng Qing‐Guo , Peng Chun‐Yun , Fu Lian‐She , Liu Feng‐Yi , Yu Ying‐Ning 
Published: August 2006

AbstractThe ligand Hhfth [4,4,5,5,6,6,6‐heptafluoro‐1‐(2‐thienyl)hexane‐1,3‐dione], which contains a heptafluoropropyl group, has been used to synthesize several new ternary lanthanide complexes (Ln = Er, Ho, Yb, Nd) in which the synergistic ligand is 1,10‐phenanthroline (phen) or 2,2′‐bipyridine (bipy). The two series of complexes are [Ln(hfth)3phen] [abbreviated as (Ln)1, where Ln = Er, Ho, Yb] and [Ln(hfth)3bipy] [abbreviated as (Ln)2, where Ln = Er, Ho, Yb, Nd]. Members of the two series have been structurally characterized. The growth morphology, diffuse reflectance (DR) spectra, thermogravimetric analyses, and photophysical studies of these complexes are described in detail. After ligand‐mediated excitation of the complexes, they all show the characteristic near‐infrared (NIR) luminescence of the corresponding Ln3+ ions (Ln = Er, Ho, Yb, Nd). This is attributed to efficient energy transfer from the ligands to the central Ln3+ ions, i.e. an antenna effect. The heptafluorinated substituent in the main hfth sensitizer serves to reduce the degree of vibrational quenching. With these NIR‐luminescent lanthanide complexes, the luminescent spectral region from 1300 to 1600 nm, which is of particular interest for telecommunication applications, can be covered completely. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Tuned Helical Array of RhIII/IrIII Cp* Complexes with Polypyridyl Ligands
Authors: Singh Sanjay K. , Chandra Manish , Dubey Santosh K. , Pandey Daya S. 
Published: August 2006

AbstractReactions of the chloro‐bridged dimeric complexes [{(η5‐C5Me5)M(μ‐Cl)Cl}2] (M = Rh, Ir) with the polypyridyl ligands 2,3‐di(2‐pyridyl)pyrazine (dpp) and 2,4,6‐tri(2‐pyridyl)‐1,3,5‐triazine (tptz) in the presence of ammonium tetrafluoroborate gave the mononuclear complexes [(η5‐C5Me5)MCl(κ2‐dpp)]BF4 [M = Rh (1), Ir (2)] and [(η5‐C5Me5)MCl(κ2‐tptz)]BF4 [M = Rh (3), Ir (4)]. The complexes have been characterised by elemental analysis, FAB‐MS, ESMS, IR, NMR, electronic and emission spectroscopic studies and the molecular structures of 1, 2 and 3 have been crystallographically determined. Structural studies on the complexes revealed the presence of helical superstructures resulting from C–H···X (X = N, F, Cl and π) interactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Organoethynylxenon(II) Tetrafluoroborates, [RC≡CXe][BF4] – The First Examples of Isolated Alkynylxenonium Salts: Preparation and Multi‐NMR Characterisation
Authors: Frohn Hermann‐Josef , Bardin Vadim V. 
Published: August 2006

AbstractThe perfluorinated organoethynylxenon(II) salts, [RC≡CXe][BF4] [R = CF3, C3F7, (CF3)2CF, cis‐, trans‐CF3CF=CF, C6F5], were prepared by the reaction of XeF2 with the corresponding perfluoroorganoethynyldifluoroboranes, RC≡CBF2, in 1,1,1,3,3‐pentafluoropropane (PFP) or CH2Cl2 at –60 to –40 °C and isolated in 30–98 % yield. Similarly, the non‐fluorinated organoethynylxenon(II) salts [C4H9C≡CXe][BF4] and [(CH3)3CC≡CXe][BF4] were obtained in 20 to 40 % yield. All [RC≡CXe][BF4] salts are soluble in anhydrous HF (aHF) and the salts with R = C4H9 or R = (CH3)3C display sufficient solubility in the weakly coordinating solvents CH2Cl2 and PFP. The xenonium salts [RC≡CXe][BF4] were unambiguously characterised by their 1H‐, 11B‐, 13C‐, 19F‐, and 129Xe NMR spectra in solution. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Phosphavinylidene(oxo)phosphorane Mes*P(O)=C=PMes*: A Diphosphaallene Featuring λ5σ3‐ and λ3σ2‐Phosphorus Atoms
Authors: Septelean Raluca , Ranaivonjatovo Henri , Nemes Gabriela , Escudié Jean , Silaghi‐Dumitrescu Ioan , Gornitzka Heinz , Silaghi‐Dumitrescu Luminita , Massou Stéphane 
Published: August 2006

AbstractBis(2,4,6‐tri‐tert‐butylphenyl)phosphavinylidene(oxo)phosphorane (1) (Mes* = 2,4,6‐tri‐tert‐butylphenyl), the first 1λ5σ3,3λ3σ2‐diphosphaallene, has been synthesised by addition of the phosphaalkenyllithium Mes*P=C(Li)Cl to dichlorophosphane oxide Mes*P(O)Cl2. Compound 1 is stable in the solid‐state but undergoes a slow intramolecular cyclisation in solution by addition of a C–H bond of an ortho‐tert‐butyl group to the σ3‐P=C double bond. Water adds chemoselectively and regioselectively to the λ5σ3‐P=C bond, which appears to be more reactive than the λ3σ2‐P=C bond. This leads to the hydrolysis compound 8 which has been structurally characterised. The new bis(phosphane oxide)methylene 9 formed from the successive cyclisation of anortho‐tert‐butyl group to the λ5σ3‐P=C bond and addition of water to the λ3σ2‐P=C bond has also been structurally characterised. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Interactions of Insulin‐Mimetic Vanadium Complexes with the Cell Constituents ATP and Glutathione
Authors: Dörnyei Ágnes , Marcão Susana , Costa Pessoa João , Jakusch Tamás , Kiss Tamás 
Published: August 2006

AbstractIn order to assess the molecular form of vanadium insulin‐mimetic complexes in cells, the interactions of VIVO–maltolate and VIVO–dipicolinate systems with adenosine 5′‐triphosphate (ATP) and glutathione (GSH) in aqueous solution were studied by employing pH potentiometry, and EPR, CD and UV/Vis spectroscopy. The stoichiometries and stability constants of the complexes formed were determined at 25 °C with an ionic strength of I = 0.2 mol dm–3 (KCl). The most probable binding mode of the complexes formed in solution was determined by means of various spectral methods. The results suggest that from among the important cell constituents, GSH mostly takes part in the reduction of VV to VIV and helps keep VIV in this oxidation state. ATP, which is a strong VIVO binder, chelates the metal ion, forming binary and/or ternary complexes. The results of this work strongly suggest that ATP binds relevant VIVO species under cellular conditions and thus might somehow be involved in the insulin‐mimetic action of VIVO compounds. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
First Example of a Gold(I) N‐Heterocyclic‐Carbene‐Based Initiator for the Bulk Ring‐Opening Polymerization of L‐Lactide
Authors: Ray Lipika , Katiyar Vimal , Raihan Mustafa J. , Nanavati Hemant , Shaikh Mobin M. , Ghosh Prasenjit 
Published: August 2006

AbstractSynthesis, structure, and catalysis studies of two Au‐ and Ag‐based initiators, namely, [3‐(N‐tert‐butylacetamido)‐1‐(2‐hydroxycyclohexyl)imidazol‐2‐ylidene]AuCl (1c) and [3‐(N‐tert‐butylacetamido)‐1‐(2‐hydroxycyclohexyl)imidazol‐2‐ylidene]AgCl (1b), for the bulk ring‐opening polymerization of L‐lactide are reported. Specifically, gold complex 1c was obtained from silver complex 1b by the transmetalation reaction with (SMe2)AuCl. Silver complex 1b was synthesized by the treatment of 3‐(N‐tert‐butylacetamido)‐1‐(2‐hydroxycyclohexyl)imidazolium chloride (1a) with Ag2O. Compound 1a was synthesized directly from the reaction of N‐tert‐butyl‐2‐chloroacetamide, cyclohexene oxide, and imidazole. The molecular structures of 1a, 1b, and 1c have been determined by X‐ray diffraction studies. The formation of neutral monomeric complexes with linear geometries at the metal centers was observed for both 1b and 1c. The Au and Ag complexes 1c and 1b successfully catalyzed the bulk ring‐opening polymerization of L‐lactide at elevated temperatures under solvent‐free melt conditions to produce moderate to low molecular weight polylactide polymers with narrow molecular weight distributions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
A Comparative Study of the Optical and Electroluminescent Properties of EuIII Complexes with TTA and 2‐(2′‐Pyridyl)azoles: The Crystal Structure of [Eu(TTA)3(PBO)]
Authors: Gao Li‐Hua , Guan Min , Wang Ke‐Zhi , Jin Lin‐Pei , Huang Chun‐Hui 
Published: August 2006

AbstractTwo EuIII mixed‐ligand complexes, namely [Eu(TTA)3(PBO)]and [Eu(TTA)3(PBT)] [TTA = 1,1,1‐trifluoro‐3‐(2‐thenoyl)acetonato, PBO = 2‐(2′‐pyridyl)‐1,3‐benzoxazole, and PBT = 2‐(2′‐pyridyl)‐1,3‐benzothiazole], have been synthesized. [Eu(TTA)3(PBO)] has been structurally characterized by single‐crystal X‐ray diffraction analysis. The complex crystallizes in the monoclinic space group C2/c. The lattice parameters are a = 41.346(4), b = 10.0538(8), c = 20.3793(16) Å, β = 110.922(2)°, Z = 8. The EuIII ion is eight‐coordinate, with three bidentate TTA– anions and one bidentate N,O‐chelated PBO molecule. A comparative study by UV and emission spectroscopy was carried out and electroluminescent properties of the related complexes [Eu(TTA)3(PBO)] and [Eu(TTA)3(PBT)] are reported as well. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)