Issue 46, 2009
From the journal:

Dalton Transactions

Co(ii) and Cr(iii) complexes of formate–formamide mixed ligands: synthesis, structures, single crystal-to-single crystal transformation and magnetic behaviour†

Oindrila Sengupta,a   You Songb  and  Partha Sarathi Mukherjee*a  

* Corresponding authors

a Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore-560012, India
E-mail: psm@ipc.iisc.ernet.in
Fax: 91-80-23601552
Tel: 91-80-2293-3352

b State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing-210093, China

Abstract

Solvothermal treatment of an equimolar mixture of Co(NO3)2·6H2O, HCONH2 and NaN3 in MeOH at 100 °C yielded a three-dimensional NaCl type network Co(HCOO)2(HCONH2)2·HCONH2 (1a) containing formamides in the pores of the structure. Solvated pink 1a undergoes single crystal-to-single crystal (SCSC) transformation at 215 °C to form the desolvated dark brown product Co(HCOO)2(HCONH2)2 (1b) with the retention of the original framework. Reversible single crystal-to-single crystal transformation of 1b (brown) to 1a (pink) in the presence of excess formamide was also established at room temperature. The coordination environment around Co(II) in both 1a and 1b is octahedral with a CoN2O4 coordination composition. A similar reaction replacing Co(II) by Cr(III) produced a heterometallic 3D extended network Na[Cr(HCOO)4(HCONH2)2]·2H2O (2a) at 100 °C. An increase in reaction temperature to 150 °C produced a simple mononuclear complex Cr(HCOO)3(HCONH2)3·3H2O (2b). Variable temperature magnetic studies revealed the presence of a canting phenomena in both 1a and 1b, and hysteresis loop in the field dependent magnetisation plot at 2 K whereas complex 2a is simply paramagnetic in nature.

Graphical abstract: Co(ii) and Cr(iii) complexes of formate–formamide mixed ligands: synthesis, structures, single crystal-to-single crystal transformation and magnetic behaviour

About
Cited by
Related
Download options Please wait...

Supplementary files

Article information

DOI
https://doi.org/10.1039/B916878H
Article type
Paper
Submitted
17 Aug 2009
Accepted
23 Sep 2009
First published
28 Oct 2009

Dalton Trans., 2009, 10343-10352

Permissions

Request permissions

Co(II) and Cr(III) complexes of formate–formamide mixed ligands: synthesis, structures, single crystal-to-single crystal transformation and magnetic behaviour

O. Sengupta, Y. Song and P. S. Mukherjee, Dalton Trans., 2009, 10343 DOI: 10.1039/B916878H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements