Synthesis, characterisation and crystal structure of a cobalt(II)-hexamethylenetetramine coordination polymer

Abstract

A novel one-dimensional zigzag coordination polymer, dinitrodiaqua-bis(hexamethylenetetramine)cobalt(II) was synthesised and characterised, and the structure was determined by single-crystal X-ray diffraction. The compound has a chain structure with each cobalt atom covalently bonded to two nitrate ions, two water molecules and two HMTA molecules, giving a slightly distorted octahedral geometry about the cobalt atom. Each HMTA ligand uses two of its N atoms to bond to two cobalt atoms giving an approximately bent Co-HMTA-Co configuration. Each chain is hydrogen bonded through OHÁÁÁN and OHÁÁÁO interactions with neighbouring chains leading to an overall polymer structure. Thermal studies show significant mass loss corresponding to the loss of the coordinated water molecules and the decomposition of both the nitrate ions and the HMTA.

Alkali metal halogenides coordination compounds with hexamethylenetetramine

“…For other compounds (1a, 1c, 3c, 4c) only bands originating from the inner coordination sphere water molecules are observed ( Table 6). The bands at about 700 cm -1 of t M-H2O vibrations (Table 4) proof coordination of water molecules to the metal ions [33,55,57]. The band at about 1,240 cm -1 is not split in the studied compounds what proofs that in all cases at least one nitrogen atom is not coordinated to the metal ion [33].…”

“…The C-N stretching vibrations of the hmta molecules existing at 815 cm -1 for pure and outer coordination sphere (compounds 1a and 1c) hmta molecules are split into two bands (mostly lower shifted, Table 6) in compounds 2b, 2c, 3c and 4c due to formation of metal-N coordination bonds [55]. The two bands at 1,670 and 1,640 cm -1 (Table 6) existing in compounds 2b and 2c spectra proof that these compounds contain two types of water molecules located in outer and inner coordination sphere (Table 6) [56].…”

Synthesis and Crystal Structure of N-(2-Pyridylmethyl)-L-Alanine) Isothiocyanate Cobalt(III)

“…Recent attention has been focused on the study of the coordination compounds of cobalt due to its varied oxidation states and their interesting structural, magnetic, electronic and optoelectronic properties [11]. Our focus has been on the synthesis of mixed ligand complexes involving tridentate reduced Schiff bases and the thiocyanate ion.…”

Мulticomponent Reactions of NH4Cl, CH2O and SH‐acids in Water as Effective Synthesis of Biologically Active Heterocycles

“…MCR of NH 4 OH with H 2 S and CH 2 O is not selective unlike MCR with aliphatic aldehydes leading to formation of 1a , 1b , 1c that are generally utilized as flavor, odorant a food additives . Among the unsubstituted heterocycles 4 , 5 , 6 , it was well studied biological activity for only hexamethylenetetramine 6 , which has been used medicinally as an antiseptic and antimicrobial agent .…”