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Crystal structure of a palladium(II) complex containing the wide bite-angle bis-(selenium) ligand, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)].

ABSTRACT: A palladium(II) complex {systematic name: dichlorido[1,3-di-tert-butyl-2,4-bis(tert-butylamino)-1,3,2λ5,4λ5-diazadiphosphetidine-2,4-diselone-κ2Se,Se']pal-ladium(II)}, cis-[PdCl2{I}], (II), containing a bis-(selenium) ligand based on cyclo-diphosph(V)azane, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)], (I), has been synthesized and structurally characterized. The crystal structure of complex II reveals that the ligand chelates through selenium donors with the natural bite-angle of 110.54 (1)° and a Pd-Se bond distance of 2.444 (1) Å. The coordination around PdII shows a slightly distorted square-planar geometry, as indicated by the angle between the [PdCl2] and [PdSe2] planes of 5.92 (3)°. In the crystal, the mol-ecules are inter-linked through weak N-H⋯Cl and C-H⋯Cl hydrogen-bonding inter-actions.

SUBMITTER: Bonnette A

PROVIDER: S-EPMC5956332 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Crystal structure of a palladium(II) complex containing the wide bite-angle bis-(selenium) ligand, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)].

Bonnette Austin A Mague Joel T JT Chandrasekaran Perumalreddy P

Acta crystallographica. Section E, Crystallographic communications 20180119 Pt 2

A palladium(II) complex {systematic name: dichlorido[1,3-di-tert-butyl-2,4-bis(tert-butylamino)-1,3,2λ5,4λ5-diazadiphosphetidine-2,4-diselone-κ2Se,Se']pal-ladium(II)}, cis-[PdCl2{I}], (II), containing a bis-(selenium) ligand based on cyclo-diphosph(V)azane, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)], (I), has been synthesiz ...[more]

PMID: 29850049

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Project description:Selenium (Se) hyperaccumulator plants can concentrate the toxic element Se up to 1% of shoot (DW) which is known to protect hyperaccumulator plants from generalist herbivores. There is evidence for Se-resistant insect herbivores capable of feeding upon hyperaccumulators. In this study, resistance to Se was investigated in seed chalcids and seed beetles found consuming seeds inside pods of Se-hyperaccumulator species Astragalus bisulcatus and Stanleya pinnata. Selenium accumulation, localization and speciation were determined in seeds collected from hyperaccumulators in a seleniferous habitat and in seed herbivores. Astragalus bisulcatus seeds were consumed by seed beetle larvae (Acanthoscelides fraterculus Horn, Coleoptera: Bruchidae) and seed chalcid larvae (Bruchophagus mexicanus, Hymenoptera: Eurytomidae). Stanleya pinnata seeds were consumed by an unidentified seed chalcid larva. Micro X-ray absorption near-edge structure (µXANES) and micro-X-Ray Fluorescence mapping (µXRF) demonstrated Se was mostly organic C-Se-C forms in seeds of both hyperaccumulators, and S. pinnata seeds contained ∼24% elemental Se. Liquid chromatography-mass spectrometry of Se-compounds in S. pinnata seeds detected the C-Se-C compound seleno-cystathionine while previous studies of A. bisulcatus seeds detected the C-Se-C compounds methyl-selenocysteine and γ-glutamyl-methyl-selenocysteine. Micro-XRF and µXANES revealed Se ingested from hyperaccumulator seeds redistributed throughout seed herbivore tissues, and portions of seed C-Se-C were biotransformed into selenocysteine, selenocystine, selenodiglutathione, selenate and selenite. Astragalus bisulcatus seeds contained on average 5,750 µg Se g(-1), however adult beetles and adult chalcid wasps emerging from A. bisulcatus seed pods contained 4-6 µg Se g(-1). Stanleya pinnata seeds contained 1,329 µg Se g(-1) on average; however chalcid wasp larvae and adults emerging from S. pinnata seed pods contained 9 and 47 µg Se g(-1). The results suggest Se resistant seed herbivores exclude Se, greatly reducing tissue accumulation; this explains their ability to consume high-Se seeds without suffering toxicity, allowing them to occupy the unique niche offered by Se hyperaccumulator plants.

Dataset Information

Crystal structure of a palladium(II) complex containing the wide bite-angle bis-(selenium) ligand, cis-[( t BuNH)(Se)P(μ-N t Bu)2P(Se)(NH t Bu)].

Publications

Crystal structure of a palladium(II) complex containing the wide bite-angle bis-(selenium) ligand, <i>cis</i>-[( <sup><i>t</i></sup> BuNH)(Se)P(μ-N <sup><i>t</i></sup> Bu)<sub>2</sub>P(Se)(NH <sup><i>t</i></sup> Bu)].

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