Editor's note

New Super- and Supramolecular Receptor Systems - Cages, Chains, Squares, and Dendrimers Incorporating Macrocycles as Structural Elements
L.F. Lindoy

Conical Cavitands as Second Coordination Spheres and Protecting Environments. Towards Metal-Centred, Intra-Cavity Reactions
D. Armspach, I. Bagatin, E. Engeldinger, C. Jeunesse, J. Harrowfield, M. Lejeune, and D. Matt*

Biologically Potent Sulphonamide Imine Complexes of Organotin(IV): Synthesis, Spectroscopic Characterization and Biological Screening
M. Jain, V. Singh and R. V. Singh*

An Efficient Solvent Free and One-Pot Conversion of Aldehydes into Nitriles Using NH₂OH.HCl/CH₃COCl/Charcoal System
H. Sharghi* and M. Hosseini Saravi

Facile Entries for Regioselective Synthesis of [1,2,4]Triazolo- [4,3-a]pyrimidin-5(1H)-ones from 2-Thiouracil
A.S. Shawali^a,*, I.M. Abbas^a and A.M. Mahran^b

Determination of Cr(III) and Cr(VI) in Environmental Waters by Derivative Flame Atomic Absorption Spectrometry Using Flow Injection On-Line Preconcentration with Double-Microcolumn Adsorption
H-W. Sun^a,*, W-J. Kang^b, J. Ha^c, S-X. Liang^a and S-G. Shen^a

Complexation Between Rare Earth Metals and 1, 5-di(2-hydroxy-5-sulfophenyl)-3- Cyanoformazan Occurring on Cetyltrimethylammonium Bromide Micelle
L-X. Zheng^a, H-W. Gao^b,* and R-Y. Xue^c

Synthesis, X-ray Characterization, NMR and Ab Initio Molecular-Orbital Studies of Some Cadmium(II) Macrocyclic Schiff-Base Complexes with Two 2-Aminoethyl Pendant Arms
H. Keypour^a,*, H. Khanmohammadi^a, K.P. Wainwright^b and M.R. Taylor^b

Complexation of Vanadium(IV) with Hydroxamate Chelators and Their Stability Relation with pH
K. Ali, N. Fatima*, Z.T. Maqsood and S.A. Kazmi

An Ab Initio Study of Conformational Properties of (Z,Z)-, (E,Z)- and (E,E)-Cycloocta-1,5-diene
I. Yavari^a,*, H. Kabiri-Fard^b, S. Moradi^b

Simultaneous Preconcentration Flotation-Separation and Spectrophotometric Determination of Thorium, Lanthanum and Yttrium in Some Geological and Enviromental Samples
A.M. Abdallah, M.A. Kabil, M.A. Akl*, D.S. Ismael