01473nas a2200241   4500008004100000022001400041245008600055210006900141260007300210300001200283490000800295520063300303653002400936653001400960653001800974653002300992653000801015100001801023700001801041700002501059700002801084856011901112       2006                        eng d  a0304-885300aSize-dependent magnetic properties of nanocrystalline yttrium iron garnet powders0 aSizedependent magnetic properties of nanocrystalline yttrium iro  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN  a212-2190 v3013 a<p>Yttrium iron garnet (YIG) powders with particle sizes of 9, 14, 25 and 60 nm have been synthesised and their magnetic properties have been studied as a function of particle size and temperature. The particles with sizes of 9 and 14 nm exhibited superparamagnetism. The blocking temperature (T-B) decreased with decreasing particle size, whereas the anisotropy constant (K) increased. The saturation magnetisation (M-s) decreased with decreasing particle size. These variations are attributed to large surface-to-volume ratios in nanoparticles where the surface moments are predominant. (c) 2005 Published by Elsevier B.V.</p>10aanisotropy constant10aMagnetism10aNanoparticles10aSuperparamagnetism10aYIG1 aRajendran, M.1 aDeka, Sasanka1 aJoy, Pattayil, Alias1 aBhattacharya, Asish, K.  uhttp://library.ncl.res.in/content/size-dependent-magnetic-properties-nanocrystalline-yttrium-iron-garnet-powders-002639nas a2200253   4500008004100000022001400041245022900055210006900284260006900353300001200422490000800434520157900442653001902021653001402040653002702054653002902081100003302110700002202143700002602165700001902191700003002210700002002240856012502260       2011                        eng d  a0020-169300aLigand dynamics controlled reverse spin cross over in bis pyrazolyl pyridine based Fe(II) complex cation with metallodithiolato anions with an example of a ferromagnetic 2:1 cocrystal of mixed Ni(III)/Ni(II) oxidation states0 aLigand dynamics controlled reverse spin cross over in bis pyrazo  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAUG  a586-6000 v3743 a<p>We report here the crystal and molecular structures of three compounds [FeL(2)] [Ni(mnt)(2)] (1), [FeL(2)](2) [Ni(mnt)(2)](3)center dot 2H(2)O (2) and [FeL(2)] [Cu(mnt)(2)]center dot 2CH(3)CN (3) where L = 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl) pyridine and mnt = maleonitriledithiolate, and their detailed spectroscopic and magnetic properties using variable temperature Mssbauer, EPR, susceptibility studies, along with room temperature electron spectroscopy for chemical analysis (ESCA) studies. The observed temperature dependant high spin/low spin (HS/LS) ratios of [FeL(2)](2+) cations in these lattices, exhibiting `reverse spin cross-over' measured unequivocally by Mssbauer, have been interpreted as resulting from differing amount of `void space' in the lattice, a measure of the ease of lattice dynamics originating from ligand L. Differential scanning calorimetric data points this HS/LS transition to order-disorder type of second order phase transitions. While trying to test this lattice dynamics controlled property of [FeL(2)](2+) cations an unusual behavior of cocrystallization of two planar complex anions of the same type in two different oxidation states, viz. [Ni(mnt)(2)](2) and [Ni(mnt)(2)] , was observed in [FeL(2)](2+) [Ni(mnt(2))](3), supported by crystallography, ESCA chemical shifts of Ni 2p(3/2) and EPR. The susceptibility data in combination with ESCA chemical shifts of S 2p(3/2) and Ni 2p(3/2) on all the compounds reveal the importance of charge transfer between the two counter ions. (C) 2011 Elsevier B.V. All rights reserved.</p>10aIron complexes10aMagnetism10aReverse-spin crossover10aX-ray crystal structures1 aManoharan, Periakaruppan, T.1 aSambandam, Balaji1 aAmsarani, Ramamoorthy1 aVarghese, Babu1 aGopinath, Chinnakonda, S.1 aNomura, Kiyoshi  uhttp://library.ncl.res.in/content/ligand-dynamics-controlled-reverse-spin-cross-over-bis-pyrazolyl-pyridine-based-feii-002453nas a2200289   4500008004100000022001400041245016700055210006900222260000800291300001200299490000800311520147400319653002701793653001701820653000801837653001601845653001401861653002201875100002001897700002001917700002201937700001701959700001901976700002601995700002102021856012102042       2018                        eng d  a0020-169300aTetranuclear cubane Cu4O4 complexes as prospective anticancer agents: Design, synthesis, structural elucidation, magnetism, computational and cytotoxicity studies0 aTetranuclear cubane Cu4O4 complexes as prospective anticancer ag  cMAR  a121-1320 v4733 aTwo new homometallic Cu4O4 cubane clusters 1 and 2 have been synthesized by self-assembly of copper (II) acetate and ligand, 2-[(2-Hydroxy-3-methoxy-benzylidene)-amino]-2-hydroxymethyl-propane-1, 3-diol (H4L) and characterized thoroughly by various spectroscopic techniques and single crystal X-ray diffraction analysis. Temperature- dependent magnetic susceptibility measurements have been performed to elucidate the antiferromagnetic and ferromagnetic nature in Cu4O4 clusters 1 and 2, respectively. In vitro DNA binding studies of cubane clusters were carried out by employing optical spectroscopic techniques. Gel electrophoretic mobility assay performed to examine the nuclease activity of the complexes 1 and 2 with pBR322 DNA, and results revealed oxidative DNA cleavage via reactive oxygen species (ROS) species viz., O-2(.-), O-1(2), etc. In vitro cell proliferation via MTT assay was studied to calculate the cytotoxicity of complexes 1 and 2. The IC50 evaluated were similar to 20 mu M in MCF-7 (Breast) and similar to 30-35 mu M in HepG2 (Liver) cancer cell lines. Additionally, in the presence of 1 and 2, ROS and TBARS (Thiobarbituric acid reactive substance) levels amplified significantly, coupled with GSH (glutathione) levels in cancer lines. Hence, the results exhibited the major role of ROS in apoptosis induced by 1 and 2 clusters and validate their prospective to be efficient anticancer drug entities. (C) 2018 Elsevier B.V. All rights reserved.10aCu4O4 cubane complexes10aCytotoxicity10aDFT10aDNA binding10aMagnetism10aNuclease activity1 aUsman, Mohammad1 aArjmand, Farukh1 aKhan, Rais, Ahmad1 aAlsalme, Ali1 aAhmad, Musheer1 aBishwas, Mousumi, Sen1 aTabassum, Sartaj  uhttp://library.ncl.res.in/content/tetranuclear-cubane-cu4o4-complexes-prospective-anticancer-agents-design-synthesis