bluuebunny/crossref_metadata_2025_split huggingface dataset:
HoF[SeO3] und Ho3F[SeO3]4: Zwei fluorid‐derivatisierte Oxoselenate(IV) des Holmiums
Authors: Lipp Christian , Schleid Thomas 
Published: July 2008

AbstractHoF[SeO3] and Ho3F[SeO3]4: Two Fluoride‐ Derivatized Holmium Oxoselenates(IV)Three different structure types of rare‐earth metal(III) fluoride oxoselenates(IV) with the formula MF[SeO3] (M = Y, La, Lu) exist so far, whereas for the intermediate lanthanoids M3F[SeO3]4‐type compounds are known with the elements gadolinium and dysprosium. Holmium is now the first lanthanoid realizing both formula types of fluoride oxoselenates(IV), HoF[SeO3] as well as Ho3F[SeO3]4. HoF[SeO3] crystallizes isotypically to YF[SeO3] in the monoclinic system with space group P21/c (a = 657.84(6), b = 688.73(7), c = 718.25(7) pm, β = 99.213(5)° and Z = 4). Ho3+ at the general site 4e is surrounded by six oxide and two fluoride anions forming [HoO6F2]11− polyhedra (d(Ho–O) = 229−244 plus 261 pm, d(Ho–F) = 219 and 221 pm, CN(Ho3+) = 8). Like in YF[SeO3] the $^{2}_{\infty}\rm \{[HoO_{3}F]^{4-}\}$ sheets resulting from condensation of these polyhedra are interconnected by Se4+ cations showing a ψ1‐tetrahedral oxygen coordination as discrete [SeO3]2− anions (d(Se–O) = 167 – 175 pm), but by imaginary removal of the latter only $^{1}_{\infty}\rm \{[HoF^{v}_{2/2}]^{2+}\}$zigzag chains running parallel to the [001] direction remain. Ho3F[SeO3]4 crystallizes in the non‐centrosymmetric hexagonal space group P63mc (a = 1030.24(3), c = 680.37(2) pm and Z = 2). Three [HoO8F]14− polyhedra (d(Ho–O) = 232–254 pm and d(Ho–F) = 233 pm, CN(Ho3+) = 9) at a time are connected via common O2···F edges and four attached ψ1‐tetrahedral [SeO3]2− anions (d(Se–O) = 169–170 pm) to complete the basic building block {FHo3[(Se1)(O1)3][(Se2)(O2)(O3)2]3}. These entities with F−‐centered (Ho3+)3 triangles represent a single formula unit and share triangular (O1,O3,O3) faces with six other blocks in [001] direction. Large hexagonal channels are remaining in between which harbor the “lone‐pair” electrons of the isolated [(Se2)(O2)(O3)2]2− anions. Due to the free position of z/c in space group P63mc, z/c = 1/4 was chosen for the unique fluoride anion on site 2b (site symmetry: 3m.) in order to unify the descriptions for all M3F[SeO3]4‐type compounds eventually. The syntheses of HoF[SeO3] and Ho3F[SeO3]4 succeeded by reacting holmium sesquioxide (Ho2O3), holmium trifluoride (HoF3) and selenium dioxide (SeO2) in molar ratios of 1 : 1 : 3 and 4 : 1 : 12, respectively, with CsBr as fluxing agent within five days at 750 °C in evacuated graphitized fused‐silica ampoules.
Synthesis, Crystal Structure and Magnetic Behaviour of {[Co(dimb)2(H2O)2]·(NO3)2·(H2O)2}n
Authors: Yao Jing‐Cai , Zhang Li , Wang Yu‐Fang , Ma Lu‐Fang , Wang Li‐Ya 
Published: July 2008

AbstractThe title complex {[Co(dimb)2(H2O)2]·(NO3)2·(H2O)2}n (1) (dimb = 1,3‐di(imidazol‐1‐ylmethyl)‐5‐methylbenzene) has been hydrothermally synthesized by the reaction of dimb with Co(NO3)2·6H2O in aqueous solution. The cobalt(II) atoms are linked by bridging dimb ligands to form 2D corrugated and wavy networks containing Co4(dimb)4 macrocyclic motifs. Two neighboring independent layers interlinked each other in a parallel fashion to construct three‐dimensional structure by O–H···O, N–H···O and C–H···O hydrogen bonds. Magnetic measurement shows the weak antiferromagnetic interaction with a one‐dimensional chain model in the range of 5–300 K, with J of –0.68 cm−1.
Synthesis and Kinetic Study of Hydroxy/Fluoroapatite Solid Solution Formation by Decomposition of a Ca‐EDTA Complex
Authors: Arguedas Rebeca , Ledezma‐Gairaud Marisol , Sáenz Alejandro , Arias Juan D. , Montero Mavis L. 
Published: July 2008

AbstractFluoroapatite/hydroxyapatite (FA/HA) solid solutions were synthesized through the decomposition of a Ca(EDTA) complex in presence of phosphate and fluoride ions. Fluorine content and morphology depend on initial pH value. Phase identification, fluorine content, crystallinity and morphology of the obtained products were studied via chemical analysis, FTIR, SEM, XRD, and EDS. The kinetic study shows a catalytic dependence on pH value. The values of k0, kH+ and kOH are reported.
α‐Tetraphosphorus Trichalcogenide Diamides and Imides containing both Sulfur and Selenium
Authors: Tattershall Bruce W. , Holmes Kathryn E. , Tweedy Catherine , Valks Gina C. 
Published: July 2008

AbstractReaction of a mixture of bicyclic phosphorus sulfide selenide iodides α‐P4SnSe3−nI2 (n = 0–3) with PriNH2 and Et3N gave corresponding diamides α‐P4SnSe3−n(NHPri)2 (n = 0–3) and imides α‐P4SnSe3−n(μ‐NPri) (n = 2–3), identified in solution by 31P NMR. In one isomer of α‐P4S2Se(μ‐NPri), the C2 symmetry of imides such as α‐P4S3(μ‐NPri) was broken, allowing relative assignment of 2J NMR couplings to the PNP bridge and the PSP bridge opposite to it. The coupling through the sulfur bridge was found to be reduced to ca. zero, in contrast to previous assumptions for this class of compounds. Ab initio models were calculated at the MPW1PW91/svp level for the sulfide selenide imides and for a selection of bond rotamers of the diamides, and at the MPW1PW91/LanL2DZ(d) level for the sulfide selenide diiodides. Different skeletal isomers were prevalent for the mixed chalcogenide diamides than for the diiodides, showing that exchange of chalcogen between skeletal positions took place in the amination reaction even at room temperature. Similar differences to those observed were predicted by the models, suggesting that equilibrium was attained.
Salts of 1H‐Tetrazole – Synthesis, Characterization and Properties
Authors: Klapötke Thomas M. , Stein Marco , Stierstorfer Jörg 
Published: July 2008

AbstractThe most facile route for the formation of 1H‐Tetrazole (1, TZ) is the reaction of sodium azide with ammonium chloride and orthoethyl formate in glacial acetic acid. 1 was deprotonated using alkali hydroxides and carbonates yielding the corresponding metal salts LiTZ (4), NaTZ·H2O (5), KTZ (6), RbTZ (7) and CsTZ (8). The nitrogen rich salts NH4TZ·H2O (2) and N2H5TZ (3) were synthesized by the reaction of 1H‐tetrazole with aqueous NH3 and N2H4 solutions, respectively. In addition, Sr(TZ)2·5H2O (9) was obtained by deprotonation of 1 using Sr(OH)2·8H2O and its use as possible energetic ingredient in modern pyrotechnic compositions as a red component was investigated. All compounds were characterized using vibrational (IR and Raman) spectroscopy, multinuclear (1H, 7Li, 13C, 14N, 15N) NMR spectroscopy and elemental analysis. The structures in the crystalline state of compounds 2, 3, 4, 5, 6, 7, 8 and 9 were determined using low temperature X‐ray diffraction and a detailed description is given in this work. The physico‐chemical properties of all compounds were investigated using DSC (differential scanning calorimetry) and the heats of formation were calculated using heats of combustion obtained by bomb calorimetry. Since tetrazoles often are energetic materials, the sensitivities of compounds 1–9 were tested using the BAM drophammer and friction tester. Crystal Data: 2: monoclinic, P21/n, a = 7.211(1), b = 4.0108(8), c = 17.991(4) Å, β = 91.97(3)°, V = 520.0(2) Å3, Z = 4, ρ = 1.343 g cm−3; 3: orthorhombic, Ccca, a = 6.763(1), b = 17.7510(4), c = 16.3160(8) Å, V = 1958.7(3) Å3, Z = 16, ρ = 1.385 g cm−3; 4: orthorhombic, C2221, a = 13.499(2), b = 14.389(3), c = 14.125(3) Å, V = 2743.6(9) Å3, Z = 8, ρ = 1.472 g cm−3; 5: orthorhombic, Pmma, a = 6.400(2), b = 5.837(1), c = 5.608(2) Å, V = 209.51(9) Å3, Z = 2, ρ = 1.745 g cm−3; 6: hexagonal, $P{\bar 6}$, a = 14.0037(2), b = 14.0037(2), c = 10.7285(2) Å, V = 1822.03(5) Å3, Z = 6, ρ = 1.774 g cm−3; 7: hexagonal, P63/m, a = 8.260(2), b = 8.260(2), c = 11.009(3) Å, V = 650.5(3) Å3, Z = 6, ρ = 2.367 g cm−3; 8: orthorhombic, Pbca, a = 7.3406(8), b = 9.610(1), c = 12.199(1) Å, V = 860.5(2) Å3, Z = 8, ρ = 3.118 g cm−3; 9: orthorhombic, Pnnm, a = 11.314(2), b = 13.876(3), c = 7.121(1) Å, V = 1117.9(4) Å3, Z = 2, ρ = 1.877 g cm−3.
Solvothermal Syntheses and Magnetic Properties of Two New Coordination Polymers with Mixed Ligands
Authors: Lin Chia‐Her , Tsao Tai‐Hsing 
Published: July 2008

AbstractTwo new coordination polymers, [Ni(H2O)(BDC)(bpp)]n (1) and [Co(mBDC)(bpp)]n (2) (BDC = 1,4‐benzene dicarboxylate anion; bpp = 4,4′‐trimethylene dipyridine; mBDC = 1,3‐benzene dicarboxylate anion), were synthesized by solvothermal reaction and structurally characterized. Single crystal X‐ray diffraction showed that 1 consists of an inclined interpenetration of 1D nets generating an overall 3D entanglement and compound 2 of 1D chains. The luminescent and magnetic properties of both compounds in the solid state were also investigated. Crystal data: 1: orthorhombic, Pnna; a = 18.3648(6), b = 13.6854(4), c = 16.2307(5) Å, V = 4079.3(2) Å3, and Z = 8. Crystal data: 2: triclinic, $P{\bar 1}$; a = 8.6966(4), b = 10.1093(4), c = 11.8334(4) Å, α = 68.263(1)°, β = 82.895(1)°, γ = 78.370(1)°, V = 945.16(7) Å3, and Z = 2.
Ba4Cr2US9: The First Chalcogenide Analogue of the Perovskite‐related (A3A′BO6)m(A3B3O9)n Family
Authors: Yao Jiyong , Ibers James A. 
Published: July 2008

AbstractThe compound Ba4Cr2US9, which crystallizes in space group P321, consists of one‐dimensional $^{1}_{\infty}\rm [Cr_{2}US_{9}^{2-}]$ chains separated by Ba2+ cations. Each one‐dimensional chain comprises face‐sharing CrS6 octahedra and US6 trigonal prisms in the sequence oct oct tp oct oct tp with the U and Cr centers in a linear chain parallel to [001].
Syntheses, Structure, Electrochemistry, and Optical Properties of 1,3‐Diethyl‐2,3‐dihydro‐1‐H‐1,3,2‐pyrido‐[4,5‐b]‐diazaboroles
Authors: Weber L. , Kahlert J. , Stammler H.‐G. , Neumann B. 
Published: July 2008

AbstractReaction of 2,5‐bis(dibromoboryl)thiophene (4) or 1,4‐bis(dibromoboryl)benzene (6) with two equivalents of N,N′‐dilithiated 2,3‐diaminopyridine (3) led to the generation of the pyridodiazaboroles 5 and 7 in which the two diazaborole rings are linked by 2,5‐thiophen‐diyl or 1,4‐phenylene units via the boron atom. The novel compounds were characterized by elemental analyses and spectroscopy (1H‐, 11B‐, 13C‐NMR, MS, and UV‐VIS). The molecular structure of 5 was elucidated by X‐ray diffraction. Cyclovoltammograms of 5 and 7 show two irreversible oxidation waves at 0.76 and 0.73 V, respectively vs Fc/Fc+. The novel compounds display intense blue luminescence with Stokes shifts of 76 and 74 nm and relative quantum yields of 39 and 43 % vs Coumarin 120 (Φ = 50 %).
Template Syntheses of Two Open‐framework Zinc Phosphites
Authors: Yang Yang , Zhao Yongnan , Yu Jianguo , Zhou Yang , Pang Nan , Su Hao , Pang Sha 
Published: July 2008

AbstractTwo new open‐framework zincophosphites, Zn(H6C4N2S)(HPO3) (TJPU‐4) and [C6N2H14]·[Zn3(HPO3)4] (TJPU‐5) have been hydrothermally synthesized by using 2‐mercapto‐1‐methylimidazole [MMI] and 1,4‐diazabicyclo[2.2.2]octane [DABCO] as templates. TJPU‐4 crystallizes in monoclinic space group P21/c with the cell parameters a = 8.787(4) Å, b = 9.732(4) Å, c = 10.515(4) Å, β = 105.316(6)°, V = 867.3(6) Å3. The structure of TJPU‐4 is constructed by ZnO3S tetrahedron and HPO3 pseudo‐pyramid to generate a layer of 4, 8‐network in bc plane. The organic template locates on the both sides of the 8‐membered rings and bonds to zinc atom through Zn–S bond. TJPU‐5 crystallizes in the triclinic space group $P{\bar 1}$ with cell parameters a = 9.294 (5) Å, b = 9.976 (5) Å, c = 9.986 (5) Å, α = 85.692 (7)°, β = 82.010 (7)° and γ = 80.184 (7)°, V = 902.1 (8) Å3. A novel 4488 cage is found in TJPU‐5. The connections of Zn(1)O4, Zn(3)O4 and HPO3 groups give rise to an infinite corner‐shared four‐ring chain. Using Zn(2)O4 as four connected bridges, linkages of these chains produce a 3‐D framework with intersecting 8‐ring channels running along [100], [010], [001], [011] and [111] directions.
Synthesis and Properties of Rb6Mn2O6
Authors: Pfeiffer Steffen , Fischer Dieter , Jansen Martin 
Published: July 2008

AbstractRb6Mn2O6 was prepared via the azide/nitrate route. Stoichiometric mixtures of the precursors (Mn3O4, RbN3 and RbNO3) were heated in a special regime up to 500 °C and annealed at this temperature for 75 h in silver crucibles. Single crystals have been grown by annealing a mixture with a slight excess of rubidium components at 450 °C for 500 h. According to the single crystal structure analysis, Rb6Mn2O6 is isotypic to K6Mn2O6, and crystallizes in the monoclinic space group P21/c with a = 6.924(1) Å, b = 11.765(2) Å, c = 7.066(1) Å, β = 99.21(3)°, 2296 independent reflections, R1 = 5.23 % (all data). Manganese is tetrahedrally coordinated and two tetrahedra are linked by sharing a common edge, forming a dimer [Mn2O6]6−. The magnetic behavior has been investigated.
On the Flexibility of Thioantimonate Networks: Solvothermal Syntheses and Crystal Structures of Six New Thioantimonates(III) with the [Sb4S7]2− Anion
Authors: Lühmann Henning , Rejai Zomaje , Möller Karina , Leisner Philipp , Ordolff Marie‐Eve , Näther Christian , Bensch Wolfgang 
Published: July 2008

AbstractSix new thioantimonates(III) with the [Sb4S7]2− anion were obtained under solvothermal conditions with in‐situ formed transition metal complexes as structure directors. In the two isostructural compounds [Fe(dien)2]Sb4S7·H2O (1) and [Co(dien)2]Sb4S7·0.5 H2O (2) (dien = diethylenetriamine; space group: P21/c) the layered [Sb4S7]2− anion is characterized by Sb8S8 rings with a diameter of about 9.6·7.6Å. The cation complexes are located above and below the pores of the rings. Despite the larger size of the cation complex the network topology of the third thioantimonate [Ni(dien)(tren)]Sb4S7 (3) (tren = tris(2‐aminoethyl)amine; space group: P21/n) is similar to that of the first two compounds. In the isostructural thioantimonates [M(trien)]Sb4S7 (M = Zn (4); M = Mn (5); trien = triethylenetetramine; space group: $\rm P{\bar 1}$) the M2+ ions are fivefold coordinated by four N atoms of the amine molecule and by one S atom of the thioantimonate anion forming a MN4S trigonal bipyramid. Sb8S16 building blocks are the central structural motifs of the anion. Two of the terminal S atoms at the periphery of the Sb8S16 units are bound to M2+ ions and the four remaining terminal S atoms connect adjacent Sb8S16 groups into the final [Sb4S7]2− chain. [Ni(tren)]Sb4S7 (6) (space group: $\rm P{\bar 1}$) contains a one‐dimensional anionic chain. The Ni2+ ion has two bonds to the [Sb4S7]2− anion which is a unique feature in the thioantimonate(III) chemistry. The NiN4S2 octahedron is severly distorted with one very long Ni‐S bond of 2.782(2) Å. In all compounds several short S···H distances indicate hydrogen bonding interactions.
A Series of Three‐Dimensional Rare Earth Coordination Polymers with Two Binary Carboxylate as Mixed‐Ligand: Syntheses, Structures, Properties of [LnIII(mal)(ox)0.5(H2O)2]·2H2O (Ln = Pr, Nd, and La)
Authors: Zhang Xing‐Jing , Xing Yong‐Heng , Han Jing , Ge Mao‐Fa , Niu Shu‐Yun 
Published: July 2008

AbstractA series of lanthanide coordination polymers, [LnIII(mal)(ox)0.5(H2O)2]·2H2O (Ln = Pr (1), Nd (2), and La (3); H2mal= maleic acid; H2ox = oxalic acid), were synthesized firstly by the reaction of LnIII nitrate salts with maleic anhydrid and oxalic acid under hydrothermal conditions and were characterized by elemental analysis, IR spectroscopy, and single‐crystal X‐ray diffraction. X‐ray diffraction analyses reveal that they are crystallized in orthorhombic space group Fddd. Lanthanide metal center atom (Ln) and its corresponding centrosymmtric atom link through two chelating/bridging bidentate carboxyl groups of maleic acid ligands to form an infinite inorganic rod‐shaped building unit. These rod‐shaped building units were linked to each other through the carbon atoms of the maleate anions on the [110] plane to form lanthanide‐maleic acid layers. The oxalic acid pillared lanthanide‐maleic acid layers with intersected channels by free water molecules consist of a 3D framework structure. The thermogravimetric analyses of 1–3 were discussed in detail. The courses of the thermal decomposition of complexes are similar.
Magnetism and chronometers: the research of the Reverend George Fisher
Authors: Roberts G. W. 
Published: July 2008

AbstractAlthough largely remembered as an astronomer, the Reverend George Fisher (1794–1873) played a significant part in studying the performance and possible improvement of marine chronometers in the mid-nineteenth century. Appointed astronomer to the Royal Navy's Arctic expedition of 1818, while on the voyage Fisher carried out research into the effects of magnetism on the accurate running of chronometers on board ship. By this time, chronometers were standard equipment on many ships and their reliability was a matter of importance to all mariners. Fisher's published findings from this research led to considerable contemporary debate, and also influenced the work of others in the field. Moreover, as papers held at the National Maritime Museum show, he carried on his chronometer research in later life, making further contributions to the subject that have remained somewhat neglected.
Human fasting plasma concentrations of vitamin E and carotenoids, and their association with genetic variants in apo C-III, cholesteryl ester transfer protein, hepatic lipase, intestinal fatty acid binding protein and microsomal triacylglycerol transfer protein
Authors: Borel Patrick , Moussa Myriam , Reboul Emmanuelle , Lyan Bernard , Defoort Catherine , Vincent-Baudry Stéphanie , Maillot Matthieu , Gastaldi Marguerite , Darmon Michel , Portugal Henri , Lairon Denis , Planells Richard 
Published: July 2008

Plasma concentrations of vitamin E and carotenoids are governed by several factors, including genetic factors. Single nucleotide polymorphisms (SNP) in some genes involved in lipid metabolism have recently been associated with fasting plasma concentrations of these fat-soluble micronutrients. To further investigate the role of genetic factors that modulate the plasma concentrations of these micronutrients, we assessed whether SNP in five candidate genes (apo C-III,CETP,hepatic lipase,I-FABPandMTP) were associated with the plasma concentrations of these micronutrients. Fasting plasma vitamin E and carotenoid concentrations were measured in 129 French Caucasian subjects (forty-eight males and eighty-one females). Candidate SNP were genotyped by PCR amplification followed by restriction fragment length polymorphisms. Plasma γ-tocopherol, α-carotene and β-carotene concentrations were significantly different (P < 0·05) in subjects who carried different SNP variants in hepatic lipase. Plasma α-tocopherol concentrations were significantly different in subjects who had different SNP variants in apo C-III and cholesteryl ester transfer protein (CETP). Plasma lycopene concentrations were significantly different (P < 0·05) in women who had different SNP variants in intestinal fatty acid binding protein (I-FABP). Finally, there was no effect of SNP variants in microsomal TAG transfer protein upon the plasma concentrations of these micronutrients. Most of the observed differences remained significant after the plasma micronutrients were adjusted for plasma TAG and cholesterol. These results suggest that apo C-III, CETP and hepatic lipase play a role in determining the plasma concentrations of tocopherols while hepatic lipase and I-FABP may modulate plasma concentrations of carotenoids.
Sex ratio and female sexual status of the coconut pest,Oryctes monoceros(Coleoptera: Dynastidae), differ in feeding galleries and pheromone-baited traps
Authors: Allou K. , Morin J.-P. , Kouassi P. , Hala N'klo F. , Rochat D. 
Published: July 2008

AbstractOryctes monocerosis a serious coconut pest, causing up to 40% damage in tropical Africa. Synthetic aggregation pheromone, ethyl 4-methyloctanoate, has been used to lure adults to traps. Traps with pheromone plus decaying palm material captured a high proportion of males. This raises the question whether individuals, which damage palms are receptive to the pheromone. We studied the sex ratio of the insects feeding on coconuts and those attracted to pheromone traps. Sixty two percent of adults from feeding galleries on living coconut palms were females. Pheromone with rotting palm material lured 43% females. To investigate the reasons for this difference, we compared the reproductive system of females lured to the odour traps or feeding in coconut galleries, or present in old rotting stems. Ninety six percent of the females trapped by pheromone had mated, and were sexually mature. In the galleries on living palms, 46% of females were immature, and 24% had not mated. In old rotting stems where eggs are laid and larvae develop, a mixture of 52% mated and 48% virgin females was found. Therefore, the pheromone together with the odour of rotting coconut stems signals a reproduction site to beetles, particularly mature females. In practice, the pheromone-baited traps will help in reducing the dissemination of gravid females, but will not affect directly the numbers of immature ones attacking palms. Our results show that when using pheromones for monitoring or controlling insects, the physiological status of the insects may have unexpected effects on the outcome.
Disruption of Spodoptera exigua larval development by silencing chitin synthase gene A with RNA interference
Authors: Chen X. , Tian H. , Zou L. , Tang B. , Hu J. , Zhang W. 
Published: July 2008

AbstractRNA interference (RNAi) is a powerful tool for rapidly analyzing gene functions. However, little is known about the possible use of dsRNA/siRNA as a pest control method. Here, we demonstrate that dsRNA/siRNA can induce the silence of chitin synthase gene A (CHSA), which is an important gene for the growth and development of cuticles and trachea in beet armyworm, Spodoptera exigua. Based on the in vitro RNAi experiments in an insect cell line (Trichoplusia ni High 5), in vivo RNAi was performed by injecting synthesized dsRNA/siRNA into the 4th instar larvae of S. exigua. Significantly lower levels of CHSA transcripts were detected. In addition, the cuticle of these insects was disordered and the epithelial walls of larval trachea did not expand uniformly in injected individuals. Moreover, Injections significantly increased abnormalities relative to control larvae. These results highlighted the possibility of dsRNA/siRNA for gene function studies in lepidopteran insects and future pest control.
Molecular markers reveal strong geographic, but not host associated, genetic differentiation inAphidius transcaspicus, a parasitoid of the aphid genusHyalopterus
Authors: Lozier J.D. , Roderick G.K. , Mills N.J. 
Published: July 2008

AbstractHost plant associated genetic differentiation is a common phenomenon in phytophagous insects, but the degree to which such associations sequentially drive diversification at higher trophic levels is not as well understood. A recent study examining neutral molecular markers inHyalopterusaphids revealed that genetic structure in this genus is strongly determined by primary host plant use (Prunusspp.). In this paper, we take a similar approach to determine whether this host plant specificity has affected genetic structure in the parasitoidAphidius transcaspicus, an important natural enemy ofHyalopterusspp. in the Mediterranean. Mitochondrial DNA (428 bp) and seven microsatellite loci were examined in parasitoids collected from aphid populations on almond, apricot, peach and plum trees from Spain and Greece. In contrast to the previous findings forHyalopterusfrom the same regions, here we find no evidence for host associated diversification inA. transcaspicusat the species level or below, though geographic structure between regional populations is exceptionally high. These findings have several implications for our understanding of the ecology and evolution ofA. transcaspicusas well as for its use as a biological control agent forHyalopterus, suggesting that a consideration of host plant specificity may be less critical than factors such as climatic suitability or geographic origins of invasive populations.