Molecular sexing in Kea Nestor notabilis

DNAによる性判別法のミヤマオウムへの利用を目的として､鳥類の性染色体上に存在するCHD(chromo-helicase-DNA binding protein)遺伝子を標的とする2種類のプライマーセットについて検討した。その結果､ミヤマオウムでは､2種類のプライマーセットでDNAの増幅が認められた。しかし､オウム､インコ類においで性判別の報告があるプライマーAの雌雄間で認められる型が異なること から判別ができなかった。一方､ワシ､タカ類のCHD-Wの配列を基に設計されたプライマーBを用いた方法では､ミヤマオウムのW染色体由来の増幅産物のみが検出されることから性判別が可能となった。また､対照として用いたヨウムは､2種類のプライマーセットで性判別が可能であったことから､プライマーBは､他の鳥種でも性判別のできる可能性が示唆された

Trigonal dodecahedral sodium coordination in a trinuclear copper(II)-sodium complex incorporating a salen-type compartmental Schiff base

A new trinuclear heterometallic complex, [(CuL)Na(CuL)]·ClO4 (1), has been prepared using a Schiff base, H2L (where H2L=N,N′-(1,2-phenylene)-bis(3-methoxysalicylideneimine) and characterized by elemental analysis, Fourier transform infra-red (FT-IR) spectroscopy, UV/Vis, magnetic, electrochemical, and single crystal X-ray diffraction methods. The structure analysis reveals that two metallo-ligand [(CuL)] units are connected to each other by a sodium ion resulting in the cationic unit [(CuL)Na(CuL)]+. Both the copper(II) ions display an almost square planar geometry while the sodium ion adopts a trigonal-dodecahedral coordination geometry. The spectroscopic and other physicochemical studies are in good agreement with the crystal structure of the complex

Synthesis, Characterization and Magnetic Studies of a Tetranuclear Manganese(II/IV) Compound Incorporating an Amino-Alcohol Derived Schiff Base

A new tetranuclear mixed-valence manganese(II/IV) compound [MnIIMnIV3(μ-Cl)3(µ3-O)(L)3] (1) (where H3L = (3E)-3-((Z)-4-hydroxy-4-phenylbut-3-en-2-ylideneamino)propane-1,2-diol) has been synthesized and characterized by different physicochemical methods. Single crystal X-ray diffraction analysis reveals that 1 is a tetrahedral cluster consisting of a Mn4Cl3O4 core in which the only Mn(II) ion is joined through three μ2-O bridges to an equilateral triangle of Mn(IV) ions, which are connected by a μ3-O and three μ2-Cl bridges. The redox behavior of 1 was studied by cyclic voltammetry. Variable temperature magnetic susceptibility measurements of 1 revealed predominant antiferromagnetic coupling inside the Mn4Cl3O4 cluster

Syntheses, characterization, and crystal structures of few dioxomolybdenum(VI) complexes incorporating tridentate hydrazones

Three new cis-dioxomolybdenum(VI) complexes, [MoO 2 (L 1 )(CH 3 OH)] (1), [MoO 2 (L 2 )(CH 3 OH)] (2), and [MoO 2 (L 3 )(CH 3 OH)] (3) have been synthesized using three different tridentate hydrazone Schiff bases, (E)-N 0 -(4-oxopentan-2-ylidene)isonicotinohydrazide (H 2 L 1 ), (E)-N 0 -(4-oxo-4-phenylbutan-2- ylidene)isonicotinohydrazide) (H 2 L 2 ), and (E)-N 0 -(2,3-dihydroxybenzylidene)benzohydrazide (H 2 L 3 ), respectively. The ligands and their metal complexes were characterized by different physicochemical techniques. The molecular structures of the complexes were conclusively established by single crystal X-ray diffraction which reveals that six coordinated molybdenum(VI) atom adopts distorted octahedral geometry. The tridentate hydrazone coordinates to the metal centers in their di-anionic form. The crystal packing of the complexes also reveals that classical hydrogen bonding between adjacent units result in stair-like 1D structure for 1 while an interlocked dimer for 2 and 3, respectively. Crystal packing also reveals that further non-classical interactions lead to 2D (for 1 and 3) and 3D (for 2) supramolecular structures in their solid state. Hirshfeld surface analyses were carried out to get insight to the intermo- lecular interactions. Thermal stabilities and electrochemical behavior of the complexes have also been investigated

Ferromagnetic copper(II)–copper(II) interaction in a single chlorido and dicyanamido bridged mixed–valence copper(I/II) 2-D polymer generated byin situpartial reduction of copper(II)

A mixed-valence 2-D Cu(I/II) complex, [{Cu(II)(dmen)(μ-Cl)(μ 1,5 -dca)}{Cu(I)(μ 1,5 -dca)}] n (1) (dmen = N,N-dimethylethylenediamine, dca = dicyanamide = [N(CN) 2 ] − ), has been synthesized by in situ partial reduction of Cu(II) to Cu(I) using benzoin (2-hydroxy-1,2-di(phenyl)ethanone) as reductant. Complex 1 was characterized by spectroscopic techniques, single crystal X-ray diffrac- tion, and low temperature magnetic measurements. Structural investigation reveals that 1 represents a mixed-valence 2-D coordination polymer formed by parallel 1-D [Cu(II)(dmen)(Cl)Cu(I)(μ 1,5 - dca) 2 ] n chains running along the b axis, where chloride bridges Cu(II) ions of adjacent polymers through long connections (2.8401(1) Å) to form a 2-D network. The metal centers have two differ- ent geometrical environments (distorted square pyramidal and distorted trigonal planar geometries for Cu(II) and Cu(I), respectively). The Cu(II) ions in [Cu(II)(dmen)(μ-Cl)(dca)] n are interconnected through single chloride bridges while within the [Cu(I)(μ 1,5 -dca)] n units, the dca connects adjacent Cu(I) ions through μ 1,5 -dca bridges. Magnetic susceptibility measurements reveal weak ferromag- netic interactions (J = +0.3 cm −1 ) within the chlorido-bridged Cu(II) regular chain present in 1. Simultaneous presence of μ 1,5 -dca and single chlorido bridges with ferromagnetic coupling is believed to be unique in mixed-valence Cu(I)/Cu(II) complexes

A Hexanucluear copper(II) Schiff base complex incorporating rare “bicapped cubane” core: structural aspects, magnetic properties and EPR study

The reaction of Cu2(CH3COO)4·2H2O with the Schiff base ligand, H4L [(OH)2C6H3CH=N–C(CH3)(CH2OH)2], yields a novel hexanuclear copper (II) cluster {[Cu6(HL)4]·CH3OH·0.5CH3CN·6.5H2O} (1) with a rare “bicapped cubane” core. Title complex has been characterized by different physico-chemical techniques. Single-crystal X-ray structure reveals that the “bicapped cubane” core was formed by a cubane-like Cu4O4 subcore capped by two copper(II) atoms over opposite faces. The cubane copper(II) atoms are in distorted square pyramidal geometry and connected each other via μ3-alkoxo oxygens while two apical copper(II) atoms are in distorted square planar environments and connected to the main cubane subcore by doubly phenoxo bridged oxygen atoms. EPR spectra of the complex reveals overall strong antiferromagnetic behavior, well supported by cryomagnetic susceptibility measurements in the range 2–300 K under the magnetic field of 0.1 T leading different coupling constants: J1 = +60 cm−1, J2 = −45.5 ± 1 cm−1; J3 = −140 ± 1 cm−1, using the general Hamiltonian H = −J(Si·Sj). A plausible magneto-structural correlation has also been established

Synthesis, crystal structure and fluorescence properties of two dinuclear zinc(II) complexes incorporating tridentate (NNO) Schiff bases

Reactions of hydrated zinc(II) trifluoroacetate and sodium azide with two tridentate Schiff bases HL1 (2-((E)-(2-(dimethylamino)ethylimino)methyl)-4-chlorophenol) and HL2 (2-((E)-(2-(dimethylamino)ethylimino)methyl)-4-bromophenol) under the same reaction conditions yielded two dinuclear isostructural zinc(II) complexes, Zn(L-1)(N-3)](2) (1) and Zn(L-2)(N-3)](2) (2), respectively. The complexes were characterized systematically by elemental analysis, UV-Vis, FT-IR, and H-1 NMR spectroscopic methods. Single-crystal X-ray diffraction studies reveal that each of the dinuclear complexes consists of two crystallographically independent zinc(II) ions connected by double bridging phenoxides. All zinc(II) ions in 1 and 2 are surrounded by similar donor sets and display distorted square-pyramidal coordination geometries. The ligands and complexes reveal intraligand (1)(*) flourescence. The enhancement of the fluorescence intensities for the complexes compared to the ligands indicates their potential to serve as photoactive materials. GRAPHICS]

Syntheses, structural diversity and photo-physical properties of copper(I) and silver(I) coordination polymers based on the pyridine-4-amidoxime ligand

Three new complexes, [{Cu(L)I}2]n (1), [Ag(L)]n.nClO4 (2) and [{Ag(L)(CF3COO)}2]n (3), have been synthesised and characterized by different physico-chemical methods with the aim of exploring the ligating properties of pyridine-4-amidoxime (L). Single crystal X-ray structure analysis reveals that 1 is a 2D coordination polymer, while 2 and 3 are wavy 1D chains in spite of the same coordination mode adopted by the ligand. The crystal structures also show that the coordination geometry of the metals is different in each complex, being tetrahedral in 1, but distorted trigonal planar and distorted linear in 2 and 3, respectively. The asymmetric units of 1 and 3 consist of two independent metal centres and each is associated with a counter anion of the metal salt used, while the asymmetric unit of 2 is cationic in nature, the perchlorate anion being non-coordinated. Structural diversities are also evident as the 2D structure of 1 is stabilized by O\u2013H...I interactions, while several classical and non-classical hydrogen bonds lead to 3D supra-molecular structures for complexes 2 and 3. The solid state fluorescence of L and of its complexes were studied revealing that both 1 and 2 show a broad emission band with a maxima at 525 and 522 nm, respectively, strongly red shifted when compared to the free ligand band (463 nm), while 3 is found surprisingly to be non-emissive

Novel mixed-valence Cu compounds formed by Cu(II) dimers with double oximato bridges: in situ formation of anionic layer [Cu2(SCN)3]n(n-)

Two new N3O donor ketoxime Schiff bases (HL(1) and HL(2)) have been synthesized by condensing N,N-dimethylethylenediamine with diacetylmonoxime and benzilmonoxime, respectively in a 1:1 ratio. Reaction of Cu(ClO4)2\ub76H2O with HL(1) resulted in a discrete oximato-bridged dinuclear Cu(II) complex [Cu2(L(1))2(H2O)2](ClO4)2 (1). The same reaction in presence of NaSCN affords the complex {[Cu(II)2(L(1))2][Cu(I)4(\u3bc(1,3)-SCN)4(\u3bc(1,1,3)-SCN)2]}n (2), where partial Cu(II)\u2192Cu(I) reduction is observed. In 2, arrays of [Cu(II)2(L(1))2](2+) cationic units are inserted in between 2D {[Cu(I)4(SCN)6](2-)}n layers and connected via \u3bc(1,1,3)-SCN(-) links, thus forming a 3D network. On the other hand, reaction of Cu(CH3COO)2 and HL(2) in the presence of NaSCN gave rise to a mixed-valence pentanuclear cluster {[Cu(II)2(L(2))2(NCS)]2[Cu(I)(SCN)(\u3bc(1,1)-SCN)(\u3bc(1,3)-SCN)]} (3) where Cu(II) is also partly reduced to Cu(I). In compound 3, two cationic [Cu(II)2(L(2))2(NCS)](+) units are bridged by the anionic [Cu(I)(SCN)3](2-) unit through long Cu-SCN linkages. The ligands and the complexes have been characterized by elemental analysis, UV/Vis and IR spectroscopy. The complexes are further characterized by single crystal X-ray diffraction and variable temperature magnetic (VTM) studies. Finally a complete magneto-structural correlation has been established between compounds 1-3 and all the characterized Cu dimers with a double NO bridge