Contents Sudeshna Saha, Souvik Pal, Carlos J. Gómez-García, Juan M. Clemente-Juan, Klaus Harms and Hari Pada Nayek Polyhedron 74 (2014) 1 A ferromagnetic tetranuclear nickel(II) Schiff-base complex with an asymmetric Ni 4 O 4 cubane core A ferromagnetic tetranuclear nickel(II) com- plex [Ni 4 (L) 4 (CH 3 OH) 2 ]Æ2MeOHÆ8H 2 O(1) has been synthesized and characterized. The solid-state structure of 1 shows a distorted asymmetric Ni 4 O 4 cubane moiety encapsu- lated by Schiff base ligands. The magnetic study of 1 showed predominant ferromag- netic coupling within the Ni 4 O 4 cluster. Amna Qasem Ali, Siang Guan Teoh, Naser Eltaher Eltayeb, Mohamed B. Khadeer Ahamed and A.M.S. Abdul Majid Polyhedron 74 (2014) 6 Synthesis of copper(II) complexes of isatin thiosemicarbazone derivatives: In vitro anti- cancer, DNA binding, and cleavage activities Six new copper(II) complexes of thiosemi- carbazone Schiff base with isatin moiety were synthesized. The interaction of these compounds with calf thymus (CT) DNA exhibited high intrinsic binding constant. CuL1 and CuL2 showed ability to cleave the DNA by oxidative pathway only, whereas CuL3, CuL4, CuL5 and CuL6 induced DNA cleavage via oxidative and hydrolytic pathway. The in vitro anti-pro- liferative study clearly establishes the anticancer potency of these complexes against (HCT 116). Aminul Huq Mirza, Malai Haniti S.A. Hamid, Sazwani Aripin, Mohammad Rezaul Karim, Md. Arifuzzaman, Mohammad Akbar Ali and Paul V. Bernhardt Polyhedron 74 (2014) 16 Synthesis, spectroscopy and X-ray crystal struc- tures of some zinc(II) and cadmium(II) com- plexes of the 2-pyridinecarboxaldehyde Schiff bases of S-methyl- and S-benzyldithiocarba- zates The complexes, [Zn(NNS)(CH 3 COO)] 2 and [M(NNS) 2 ] (M = Zn 2+ , Cd 2+ ; NNS ) = anionic forms of the tridentate Schiff bases formed by condensation of 2-pyridinecarboxalde- hyde with S-methyl- and S-benzyldithio- carbazates) have been prepared and structurally characterized. The complexes [Zn(NNS)(CH 3 COO)] 2 are centrosymmetric acetate anion bridged dimers in which the zinc atoms are five-coordinated with ap- proximately square-pyramidal geometries whereas the complexes, [M(NNS) 2 ] have distorted octahedral structures. Elsevier Ltd. Polyhedron 74, 28 May 2014 Contents lists available at ScienceDirect Polyhedron journal homepage: www.elsevier.com/locate/poly
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Contents
Sudeshna Saha, Souvik Pal,Carlos J. Gómez-García,Juan M. Clemente-Juan, Klaus Harmsand Hari Pada Nayek
Polyhedron 74 (2014) 1
A ferromagnetic tetranuclear nickel(II)Schiff-base complex with an asymmetric Ni4O4
cubane core
A ferromagnetic tetranuclear nickel(II) com-plex [Ni4(L)4(CH3OH)2]Æ2MeOHÆ8H2O (1) hasbeen synthesized and characterized. Thesolid-state structure of 1 shows a distortedasymmetric Ni4O4 cubane moiety encapsu-lated by Schiff base ligands. The magneticstudy of 1 showed predominant ferromag-netic coupling within the Ni4O4 cluster.
Amna Qasem Ali, Siang Guan Teoh,Naser Eltaher Eltayeb,Mohamed B. Khadeer Ahamedand A.M.S. Abdul Majid
Polyhedron 74 (2014) 6
Synthesis of copper(II) complexes of isatinthiosemicarbazone derivatives: In vitro anti-cancer, DNA binding, and cleavage activities
Six new copper(II) complexes of thiosemi-carbazone Schiff base with isatin moietywere synthesized. The interaction of thesecompounds with calf thymus (CT) DNAexhibited high intrinsic binding constant.CuL1 and CuL2 showed ability to cleavethe DNA by oxidative pathway only,whereas CuL3, CuL4, CuL5 and CuL6induced DNA cleavage via oxidative andhydrolytic pathway. The in vitro anti-pro-liferative study clearly establishes theanticancer potency of these complexesagainst (HCT 116).
Aminul Huq Mirza,Malai Haniti S.A. Hamid, Sazwani Aripin,Mohammad Rezaul Karim,Md. Arifuzzaman, Mohammad Akbar Aliand Paul V. Bernhardt
Polyhedron 74 (2014) 16
Synthesis, spectroscopy and X-ray crystal struc-tures of some zinc(II) and cadmium(II) com-plexes of the 2-pyridinecarboxaldehyde Schiffbases of S-methyl- and S-benzyldithiocarba-zates
The complexes, [Zn(NNS)(CH3COO)]2 and[M(NNS)2] (M = Zn2+, Cd2+; NNS) = anionicforms of the tridentate Schiff bases formedby condensation of 2-pyridinecarboxalde-hyde with S-methyl- and S-benzyldithio-carbazates) have been prepared andstructurally characterized. The complexes[Zn(NNS)(CH3COO)]2 are centrosymmetricacetate anion bridged dimers in which thezinc atoms are five-coordinated with ap-proximately square-pyramidal geometrieswhereas the complexes, [M(NNS)2] havedistorted octahedral structures.
Elsevier Ltd.
Polyhedron 74, 28 May 2014
Contents lists available at ScienceDirect
Polyhedron
journal homepage: www.elsevier .com/locate /poly
Naghmeh Foroz and FatemehNiroomand Hosseini
Polyhedron 74 (2014) 24
Effects of chelate ligands containing NN, PN,and PP on the reactivity of organoplatinum(II)complexes in oxidative addition reactions
The oxidative addition reactions of threeplatinum square planar complexes of thetype [PtMe2(LL)] (LL = NN, PN, PP) withMeI, with a systematic variation in thechelate ligands, have been theoreticallyinvestigated.
L
LPt
Me
Me+ MeI
L
LPt
Me
Me
Me
I
2,2'-bipyridine
N N
2,2'-biphosphinine2-(2-pyridyl)phosphinine
P N P PL L=
Natalia Pawlak and Gra _zyna Oczko
Polyhedron 74 (2014) 31
Optical properties of heavy lanthanide maleatesin solution and crystal form
The spectroscopic results confirm the X-raymeasurements on an Eu(C4O4H3)3Æ8H2Ocrystal, which is isostructural with theNd3+ analogue. In the absorption spectra,a �red shift� was observed for the hyper-sensitive transitions of the lanthanide ions.The variation of the spectroscopic para-meters, calculated based on the absorption
spectra, the nephelauxetic ratio b andSinha�s parameter d, suggested an increasein the �degree of covalency� of the metal–ligand coordination bond from the Eu3+
crystal to the Ho3+ crystal and to the Er3+
crystal of the title compounds. An emissionfrom the 5D1 level for europium maleatewas detected in spite of the presence ofwater molecules in the inner coordinationsphere for the lanthanide maleate crystals.On the basis of the europium maleate-excited spectra, a ligand-to-metal chargetransfer (LMCT) band was determined at345 nm.
370 375 380 385
1
2
ν(ErO)
Lattice mode 4I15/2 4G11/2
Abso
rban
ce/a
.u.
nm
480 490
1,0
1,54I15/2
4F7/2
Abso
rban
ce/a
.u.
nm
510 520 530
1
2
δ(OErO)
T = 4.2 K
latti
ce m
ode
4I15/22H11/2
Abso
rban
ce/a
.u.
nm
Absorption spectra of Er(HOOC-CH=CH-COO)3⋅8H2O crystals at 4.2 K.
Six heterometallic coordination polymers con-taining cobalt(II): Syntheses, crystal structuresand magnetic properties
Six heterometallic coordination polymerscontaining cobalt(II), CoNi (1), Co2Cu (2),Co2Ni (3), Co2Cu2 (4), Co4Ni4 (5) and CoCu(6), have been synthesized with macrocyc-lic oxamide and aromatic multicarboxylate(including aipt2), hipt2), ipt2) and tpt2))ligands, structurally determined and mag-netically studied.
Ligand induced diversification from tetranuc-lear to mononuclear compounds: Syntheses,structures and magnetic properties
Three new complexes 1–3 have beenconstructed. The studies show that theposition and steric hindrances of the sub-stituted groups are essential in determin-ing the final structures of the assemblies.The {Ni4O4} core displays dominant ferro-magnetic interactions due to the nature ofthe binding modes through l3-O.
vContents
Arpita Biswas, Arpita Jana, Sohini Sarkar,Hazel A. Sparkes, Judith A.K. Howard,Núria Aliaga-Alcalde andSasankasekhar Mohanta
Polyhedron 74 (2014) 57
Discrete systems and two-dimensional coordi-nation polymers containing potentially multi-dentate and bridging inorganic anions:Observation of a new type of two-dimensionaltopology
The work here deals with copper(II)–hex-acyanoferrate(III)/hexacyanocobaltate(III)/hexacyanochromate(III)/tetracyanonickela-te(II), cocrystalline copper(II) dicyanoar-gentate(I) and copper(II)/nickel(II)–dicyanamide compounds having a diamineas the blocking ligand. The systems arediscrete or two-dimensional in terms ofcoordinate bonds and three-dimensional interms of hydrogen bonds.
Bao-Hua Zhu, Yan-Hong Liu, Xue-Yan Jin,Hai-Ying Xu, Ya-Ya Han and Qi Zhao
Polyhedron 74 (2014) 67
Synthesis, characterization and luminescenceproperties of LnIII (Ln = Eu, Tb, Ce, Sm, Dy)complexes containing a terpyridine ligand and a3d–4f type conjugated terpyridine-alkyne brid-ging EuIII–Co0 carbonyl cluster complex
Seven new lanthanide luminescent com-plexes containing terpyridine derivates andone new EuIII–Co0 conjugated luminescentcarbonyl cluster complex have been pre-pared and characterized, including an X-ray crystal structure in the case of the CeIII
complex, with intermolecular hydrogenbonds, p–Br and p–p interactions. Theluminescence properties of these com-plexes have been investigated in the solidstate.
Vanessa Ramírez-Delgado,Ricardo Emmanuel Morales León,Luis Felipe Hernández-Ayala,Victor Angel Ramírez Coutiño,Francisco Javier Rodríguez,Guadalupe Osorio-Monreal,Juan Carlos García-Ramos,Marcos Flores-Alamo, Lena Ruiz-Azuaraand Luis Ortiz-Frade
Polyhedron 74 (2014) 72
First example of bridge mono-coordinationmode for the ligand 1,8-bis-(2-pyridyl)-3,6-dithiaoctane (pdto) in a Co(II) tetrahedralcomplex
This work presents the first Co(II)–pdtocomplex with tetrahedral geometry inwhich this versatile ligand (pdto = 1,8-bis(2-pyridyl)-3,6-dithiaoctane) presentsan unusual bridge monodentate mode. Itwas found that in solid sate and in solutionthe complex presents similar coordinationenvironment around Co(II) metal center.
Syntheses, characterization and crystal struc-tures of eight Cd(II) carboxylates containing3,5-dimethylpyrazole
Eight cadmium complexes with 3,5-di-methylpyrazole and carboxylate ligandswere prepared and characterized by EA, IRspectra, TG and single crystal XRD analysis.These complexes display mononuclear todinuclear structures with an octahedralcoordination for the cadmium cation. Theextensive non-bonding interactions in 1–8have been analyzed.
vi Contents
Mukul Kalita, Prasanta Gogoi,Pranjit Barman, Bipul Sarma,Alok K. Buragohain and Ranjan D. Kalita
Polyhedron 74 (2014) 93
A new series of Ni(II), Cu(II), Co(II) and Pd(II)complexes with an ONS donor Schiff base:Synthesis, crystal structure, catalytic propertiesand bioactivities
A new series of bichelated complexes of theformula M(L)2 and M(L)Cl, where,M = Ni(II), Cu(II), Co(II) and Pd(II) andL = deprotonated Schiff base, were synthe-
sized from 5-bromo N-[(2-benzylthio)-phenyl] salicylaldimine (HL, 1). The ligandand its complexes were characterized byelemental analyses, FT-IR, 1H NMR andUV–vis spectroscopies, thermogravimetricanalysis and conductivity studies. Thecrystal structure of the palladium complexwas determined by single crystal X-raydiffraction studies. The copper complexshows very good catalytic activity towardsthe oxidation of organic thioethers. Again,the ligand and the complexes exhibitedconsiderable antibacterial and antifungalactivities.
Sachin Kumar Singh,Hemant Kumar Singh, Rajib Nandi,Vijay Kumar, Nicolae Tarcea,Jürgen Popp, Ranjan K. Singh andBachcha Singh
Polyhedron 74 (2014) 99
Synthesis, characterization and mesomorphicinvestigations of ester-substituted aroylhydra-zones possessing a lateral hydroxyl group
The synthesis, characterization and meso-morphic investigations of a new series ofester containing benzylidene-hydrazineswith a lateral hydroxyl group, Cm,nLH, withthe same or different peripheral alkylchains, and some of their nickel(II) andcopper(II) complexes are described. A tem-perature dependent Raman study wasemployed to understand the molecularrearrangement of the molecules duringthe phase transitions.
Qinghua Meng, Jack K. Clegg,Aidan J. Brock, Katrina A. Jolliffe,Leonard F. Lindoy and Gang Wei
Polyhedron 74 (2014) 113
Mono- and dinucleating Ni(II), Cu(II), Zn(II) andFe(III) complexes of symmetric and unsym-metric Schiff bases incorporating salicyliminefunctions – Synthetic and structural studies
Both unsymmetric and symmetric Schiffbase complexes, the latter formed by imineexchange, are reported; included in theproducts are an unusual oxo-bridged Fe(III)tetranuclear cluster and a new dinuclearNi(II) species.
Ozge Ozbek, Seniz Özalp-Yaman,Ilker Ozkan, Ahmet M. Önal andHuseyin Isci
The spectroelectrochemical behavior of[Pt2(C4H3N2S)4X2] (C4H3N2S) = pyrimi-dine-2-thionate; X) = Cl), Br), I)), com-plexes have been studied. The spectralchanges observed during the reductiveelectrolysis indicate that all three com-plexes give [Pt2(C4H3N2S)4]. The changes inthe reduction potentials of the complexesare correlated to the changes in the energyof the LUMO.
viiContents
Xingfeng Sheng, Lijun Qiao, Yusheng Qin,Xianhong Wang and Fosong Wang
Polyhedron 74 (2014) 129
Highly efficient and quantitative synthesis of acyclic carbonate by iron complex catalysts
Novel iron complexes in combination withTBAB showed excellent activity for thecoupling reaction of epoxides and CO2 togenerate the corresponding cyclic carbo-nates.
Varied dicarboxylate bridges in dinuclear trigo-nal prismatic manganese(II) and octahedralnickel(II) compounds containing tetradentateN-donor Schiff bases: Syntheses, structures andmagnetic behaviors
Syntheses, crystal structures and magneticproperties of two manganese(II) and onenickel(II) dinuclear complexes with dicar-boxylate bridges and N-donor Schiff basesas end-capping ligands are described. In-teresting variation in coordination geome-tries and bridging motifs are observed inthe complexes. Variable-temperature mag-netic susceptibility measurements showweak antiferromagnetic coupling betweenthe metal centers mediated through longbridging arms of the dicarboxylates.
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