The synthesis of two bis-amidinium calixarenes 3 and 4 has been achieved. Compounds 3 and 4 selfassemble with carboxylate salts via amidinium-carboxylate salt bridges producing ditopic receptor species, © 1998 Elsevier Science Ltd. All rights reserved.

The title compound, [CoNa(4)(C(6)H(5)O(7))(2)](n), was obtained under hydro-thermal conditions as a minor product. The Co(2+) cation is located on a crystallographic inversion center and is coordinated by six O atoms from two different citrate units, forming a [Co(C(6)H(5)O(7))(2)](4-) building unit with Co-O bond lengths between 2.0578 (17) and 2.0813 (16) Å. The structure features two crystal...

The surface-enhanced Raman scattering (SERS) spectra of maleic (cis; 2-butaneoic acid) and fumaric (trans; 2-butaneoic acid) acids adsorbed on aqueous silver sol particles are reported. These two acids form two groups of isomers which differ only in the relative positions of the two carboxylate groups. The photochemistry of maleic and fumaric acids adsorbed on the surface of silver colloids...

We use surface-specific intensity vibrational sum-frequency generation and attenuated total reflection spectroscopy to probe the ionization state of the amino-acids l-alanine and l-proline at the air/water surface and in the bulk. The ionization state is determined by probing the vibrational signatures of the carboxylic acid group, representing the nondissociated acid form, and the carboxylate ...

A new dicopper(I) complex is reported that can be incorporated into extended architectures through multitopic carboxylate linkers; reversible carboxylate templation under pH control led to the formation of [2+2] and [3+3] metallomacrocycles.

We report a general method for light-assisted control of interactions of PDZ domain binding motifs with their cognate domains by the incorporation of a photolabile caging group onto the essential C-terminal carboxylate binding determinant of the motif. The strategy was implemented and validated for both simple monovalent and biomimetic divalent ligands, which have recently been established as p...

In this paper we report the synthesis of new compounds based on the pyrazole and isoxazole framework fused to a cycloalkene unit, and bearing as a substituent the 1-piperidinyl group as new examples of potential antipsychotic molecules. The general synthesis involves the acylation of a chloro-substituted cyclic ketone with a 1-substituted piperidine-4-carboxylate derivative, followed by heteroc...

In the crystal structure of the title compound, C(6)H(6)NO(2) (+)·NO(3) (-), the protonated cations are linked by N-H⋯O hydrogen bonds into chains along the b axis. The cations and anions are also linked by N-H⋯O and O-H⋯O hydrogen bonds. C-H⋯O inter-actions also occur. In the cation, the ring makes a dihedral angle of 10.1 (3)° with the carboxylate group.