A novel two-dimensional layered framework built of strontium(II) with 4-nitrobenzene-1,3-dicarboxylic acid.

In poly[[aquastrontium(II)]-micro(6)-4-nitrobenzene-1,3-dicarboxylato-kappa(7)O(1):O(2):O(2):O(3):O(3),O(4):O(4)], [Sr(C(8)H(3)NO(6))(H(2)O)](n), the Sr(II) ion displays a distorted bicapped triangular prismatic configuration, defined by seven carboxyl O atoms from six symmetry-related ligands and one water molecule. The ligand molecules connect the Sr(II) ions into a two-dimensional layered framework in the ac plane, with close O..

Tetraaquabis(5-carboxy-2-nitrobenzoato-kappaO)manganese(II) dihydrate: a metal-water chain complex containing cyclic water tetramers.

In the title complex, [Mn(C(8)H(4)NO(6))(2)(H(2)O)(4)] x 2H(2)O, cyclic water tetramers forming one-dimensional metal-water chains have been observed. The water clusters are trapped by the co-operative association of coordination interactions and hydrogen bonds. The Mn(II) ion resides on a center of symmetry and is in an octahedral coordination environment comprising two O atoms from two 5-carboxy-2-nitrobenzoate ligands and four O atoms from water molecules.

Bis(mu-3-nitrobenzene-1,2-dicarboxylato)-kappa8O1,O2:O2,O3;O3,O2:O2,O1-bis[triaqua(2-carboxy-3-nitrobenzoato-kappa2O,O')lanthanum(III)] dihydrate.

The title compound, [La2(C8H3NO6)2(C8H4NO6)2(H2O)6].2H2O, consists of dimeric units related by an inversion center. The two La(III) atoms are linked by two bridging bidentate carboxylate groups and two monodentate carboxylate groups.

Synthesis of labelled small peptide complexes for imaging agents with technetium-99m and biodistribution in mice.

Aim: To look for new heart or kidney imaging agents. Five new target chelators--2-N-(2'-s-triphenylmethylacetyl) amino-(N'-acetyl glycine) isovalericamide (MVG2), 2-N-(2'-s-triphenylmethylacetyl) amino-[N'-acetyl-(N"-butylacetaminde)] isovalericamide (MVGT), 2-N-(2'-s-tri-phenylmethylacetyl) amino-[N'-acetyl-(N"-cyclohexanylacetaminde)] isovalericamide (MVGH), 2-N-(2'-s-triphenylmethylacetyl) amino-[N'-acetyl-(N"-butylacetaminde)] phenyl propamide (MPGT) and 2-N-(2'-s-triphenylmethylacetyl) amino-[N'-acetyl-(N"-cyclohexanylacetaminde)] phenylpropamide (MPGH) were synthesized as primitive materials to explore the synthetic methods of polypeptides.

Methods And Results: All target chelators were identified on the basis of the spectroscopic data, such as IR, 1HNMR, 13CNMR and elementary analysis.

[Synthesis of new N3S pseudo-peptide complexes and biodistribution in mice].

Aim: To explore the synthetic methods of polypeptides containing new heart of kidney imaging agents.

Methods And Results: Five new target chelators--2-N-(2'-s-triphenylmethylacetyl) amino-(N'-2"-N",N"-diethylethylamine) phenylpropamide (MPNE), 2-N-(2'-s-triphenylmethyl acetyl) amino-(N'-2"-N",N"-dimethylethylamine) phenylpropamide (MPNM), 2-N-(2's-triphenylmethylacetyl) amino-3-methyl-(N'-2"-N",N"-dimethylethylamine) butyramide (MVNM), 2-N-(2'-s-triphenyl methylacetyl) amino-3-methyl-(N'-2"-N",N"-diethylethylamine) butyramide (MVNE), 2-N-(2'-s-triphenylmethylacetyl) amino-(N'-acetylglycine) phenylpropamide (MPG2)--were synthesized through five steps with mercaptoacetic acid as primitive materials, all of which were identified on the basis of spectroscopic data, such as IR, 1HNMR, MS or elementary analysis. The protection of the mercapto group was improved and the relatively new reaction condition of active ester with amino acid is developed.