Four new supramolecular coordination complexes and salts based on proton-transferred pyridine-2,6-dicarboxylic acid N-oxide formulated as (Htata)(Hpydco)·H2O (1), (Htata)2(pydco)·2H2O (2), (H9a-acr)2[Zn(pydco)2(H2O)2]·4H2O (3), and (H9a-acr)2[Co(pydco)2(H2O)2]·4H2O (4) (where H2pydco = pyridine-2,6-dicarboxylic acid N-oxide, tata = 2,4,6-triamino-1,3,5-triazine (melamine) and 9a-acr = 9-aminoacridine) have been synthesized by proton transfer from H2pydco as ligand and to tata and 9a-acr. The structures of 1–4 were characterized by elemental analysis, infrared spectroscopy, and single crystal X-ray diffraction methods. Compounds 1 and 2 are salts of proton-transferred H2pydco and melamine with two separate formulas. There is a difference between the anionic fragment in 1 and 2, the anionic part of 1 retains one acid proton (Hpydco−) which is involved in a strong, intramolecular hydrogen bonding with the oxygen attached to nitrogen, while the acid units in 2 are fully deprotonated (pydco2−). The linear chains of melaminium cations with an anionic motif and water molecules lead to 2-D zipper layers in 1 and 2-D zigzag layers in 2. These layers are held together via an extensive network of hydrogen bonds, π+–π + stacking, N+–H⋯π+, and lp⋯π+ interactions to extend the structures into the 3-D supramolecular framework. Single-crystal studies revealed that 3 and 4 are isostructural with distorted octahedral geometry about the metal consisting of two pydco2− ligands acting in bidentate fashion and two trans-disposed water molecules. They also adopt alternating cationic and anionic layers with 9-aminoacridinium cations and transition metal complex anions which are linked to each other by a variety of noncovalent interactions such as ion pairing, hydrogen bonding and π–π stacking.
Research on Chemical Intermediates – Springer Journals
Published: Apr 9, 2015
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera