Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [magnetism]

For questions about determining the paramagnetism, diamagnetism, etc. of chemical species and other chemical applications of magnetism. Note that questions oriented towards physical aspects of electromagnetism are off-topic on this site.

1
vote
0answers
20 views

Other than ultracold lithium gas, are any ferromagnetic or magnetic gasses known or hypothesized?

I'm dealing with an interactive work of fiction right now, and one proposal is to combine two types of puzzles with a magnetic gas. I know that fermionic $\ce{^6Li}$, when cooled below $\pu{1 K}$, has ...
-1
votes
1answer
36 views

Is Al2O3 (aluminum oxide) diamagnetic or paramagnetic?

The title about covers it, I am an amateur and I have found that checking 'molecule orbitals' can reveal the answer here but I cannot locate such an orbital. The reason for this question is I am ...
0
votes
1answer
20 views

Maximum metal-metal distance for antiferromagnetic coupling

Imagine a transition metal complex with multiple open-shell transition metal cations. If the metals are relatively close in distance, it is possible that antiferromagnetic coupling will occur between ...
5
votes
0answers
58 views

What is the magnetic moment of potassium hexacyanochromate(II)?

I calculated the magnetic moment of $\ce{K4[Cr(CN)6]}$? in the following way: $\ce{Cr^{+2}}$ has $4$ d electrons. And since $\ce{CN-}$ is a strong field ligand, the electrons will pair up in the $\...
-1
votes
1answer
19 views

Help understanding the equation for Spin Energy in Zero Field

I’m working with a system that experiences spin frustration and for me this is the first time dealing with such a phenomenon. To grasp the concept, I’ve decided to go to the basics and read the ...
2
votes
1answer
45 views

Magnetic couplings using DFT in a spin frustrated system

I’m working with a trimeric copper system that have the classic triangular shape and experiences spin frustration. This is my first time dealing with such system and, so far, from what I’m reading, I ...
1
vote
1answer
52 views

Help understanding external magnetic field sensitivity of radical pair reaction rate

Two recent papers have been published on magnetoreception in birds. In this case it is the ability of the birds to sense the direction of the Earth's magnetic field potentially for navigation. ...
2
votes
1answer
132 views

Jahn Teller distortion and magnetic moments.

It is relatively well known that the discrepancy between the observed and experimental magnetic moments in the first row transition metals is attributed to spin-orbit coupling when it comes to metal ...
4
votes
1answer
390 views

Is Co[Hg(SCN)4] diamagnetic?

I was reading a book and it was mentioned that $\ce{Co[Hg(SCN)4]}$ is diamagnetic. I know that it is made up of $\ce{Hg^2+}$ and $\ce{Co^2+}$. $\ce{Co^2+}$ has 7 electrons which means that it should ...
1
vote
1answer
73 views

Coordination compounds

Which of the following complex is diamagnetic? $\ce{[Cr(Cl3)(NMe3)]}$ $\ce{[Co(EDTA)]-}$ $\ce{[Cu(CN)(NO2)(NH3)(Py)]}$ $\ce{[Fe(NH3)6]^2+}$ For (4) I found that since $\ce{NH3}$ ...
0
votes
1answer
66 views

Van der Waals interaction and magnetic dipole dipole interaction

I have a conceptual question that bothers me. From what I understand, van der Waals forces are the primary source of inter-molecular interaction. There are three different possible origins for van ...
5
votes
2answers
803 views

Why is neodymium the most paramagnetic lanthanide?

My textbook says that paramagnetism rises to a maximum in neodymium. I don't understand how gadolinium has 8 unpaired electrons, whereas neodymium has only 4. Shouldn't paramagnetism be higher in ...
1
vote
2answers
713 views

Is [PdCl2(PMe3)2] diamagnetic or paramagnetic?

Please tell me where I am wrong. The complex will have $\ce{Pd^{2+}}$ ion, which has a $\mathrm{d^8}$ configuration. So, it will have $2$ unpaired electrons. Unpaired electrons will mean that it is ...
1
vote
1answer
24 views

detecting/tracking nano particle [closed]

I am new to nano-sized particles and conducting a very simple experiment using nano particles. In my experiment I have nanomagnetic particles inside water and they are moving due to applied magnetic ...
0
votes
0answers
42 views

The challenge to preserve a ferrofluid [duplicate]

Like many else Im trying to make a ferrofluid display by suspending the FF in a clear liquid to create blobs to control with magnets. The big challenge is to get the suspension liquid right and I'm ...
1
vote
0answers
242 views

Magnetic work and the first law of thermodynamics

We commonly encounter the first law of thermodynamics in the form $\mathrm{d}E = T\mathrm{d}S - p\mathrm{d}V + \mu\mathrm{d}N$, which notes the contribution of thermal, pressure-volume, and chemical ...
0
votes
0answers
64 views

Why is the copper in my pan magnetic?

My Momma bought a copper pan made for induction because it was the only one she could find that she wanted and was big enough to pan fry half a chicken. But I noticed something odd about the copper. ...
2
votes
0answers
1k views

Unpaired electrons from magnetic moment

A complex formulated as $\ce{Cs_x[NbCl6]}$ has spin-only magnetic moment $\mu_{s.o}$ of approximately 2 B.M. From this value calculate how many unpaired electrons are present. Spin-only magnetic ...
3
votes
0answers
56 views

Why does some compound as given in the image below change from low spin to high spin above a particular transition temperature?

Magnetic moment sudden increase at a particular temperature is explained by CFT. But why does it happen at all?
5
votes
1answer
97 views

Amine Inversion and Paramagnetism

In amine inversion, there is a planar $sp^2$ intermediate. The electron pair transferred from the blue lobe to the red one during the inversion. It is natural to assume, for a layman like me, that ...
3
votes
0answers
123 views

Magnetic anisotropy of triple bonds

Is the rule for shielding/deshielding areas in NMR bond dependent? The acetylene C triple bond C has deshielding zone perpendicular to the triple bond. Will the same deshielding zone hold true for C ...
3
votes
1answer
2k views

What atom is always paramagnetic and why?

Regardless of its electron configuration, it must always be paramagnetic when it's a single, neutrally charged atom: (A) Carbon (B) Nitrogen (C) Oxygen (D) Neon (E) Argon At first, I eliminated D ...
1
vote
0answers
51 views

Magnetic Water Softener

I've been asked to install some kind of technology to a building with 40 rooms to soften the water. Browsing through the product catalog I found this so called "Magnetic Water Softener", however ...
10
votes
1answer
737 views

Why is gadolinium specifically used in MRI contrast agents?

Gadolinium(III) chelate complexes are routinely used as contrast agents in magnetic resonance imaging (MRI);1 the usual explanation is that paramagnetic species contain unpaired electrons, which cause ...
17
votes
0answers
191 views

Single-molecule magnet with electrically-controlled permeability: How does the Titan Shield from Deus Ex work?

In a recent installment of Deus Ex game series there is an augmentation called "Titan Shield" (it has nothing to do with $\ce{Ti}$ element): A neodymium skin underlay matrix built of nano-meshed ...
0
votes
1answer
316 views

Magnetic and acidic properties of nitric oxide

I was faced with the following question: PART C – CHEMISTRY Which one of the following properties is not shown by $\ce{NO}$? It combines with oxygen to form nitrogen dioxide Its bond ...
21
votes
1answer
3k views

What is behind of the attraction between a burned matchstick with a magnet?

I do not know how to understand the reasons of why a burned matchstick is attracted by a magnet (most probably) of Neodymium. Here are some screenshots of a video in which this natural phenomenon is ...
6
votes
0answers
380 views

“Alternative” derivation of the spin-only formula

The spin-only formula $$\mu_\mathrm{so} = \mu_\mathrm{B} \sqrt{n(n+2)} = \mu_\mathrm{B}\cdot 2\sqrt{S(S+1)}$$ is usually a good first approximation to calculate the magnetic moment of transition ...
4
votes
1answer
55 views

Reactivity of magnetized materials

Does the magnetisation process affects the reactivity of a magnetic material? Does the electronegativity change if a metal is magnetised?
-1
votes
1answer
94 views

How does magentic field change spin values of a proton or electron? [closed]

I am asking this in context of NMR. Firstly I wanna say that I thought that spin values of a proton or electrons were intrinsic. I didn't know that you can change spin states from one value to another....
3
votes
1answer
106 views

Chemical reaction and shift in magnetic susceptibility sign

I'm trying to find an easy experiment involving a chemical reaction in which two paramagnetic reactants A and B react to give a product which is diamagnetic (or the reverse). The idea is to show that ...
1
vote
0answers
70 views

Is ZnO still diamagnetic after you dope it with aluminium?

There are no unpaired electrons in $\ce{ZnO}$, making $\ce{ZnO}$ diamagnetic. Aluminium has an unpaired electron, which would mean it is paramagnetic. Will $\ce{ZnO}$ become paramagnetic after it ...
15
votes
1answer
331 views

Why doesn't curie temperature follow a periodic trend in ferromagnetic materials

I was writing up an answer to a question which was asking why the Curie Temperature's of $\ce{Fe, Co, Ni}$ don't follow a periodic trend. The OP voluntarily deleted his question before I could finish ...
7
votes
2answers
1k views

How to determine whether a organic compound is diamagnetic or not?

I have faced several questions regarding the diamagnetic behaviour of certain organic compounds. I know that one has to check the electronic configuration of the atoms in the compound and see if there ...
1
vote
0answers
45 views

Magnetically separating H2 and O2 in a volume of gas [duplicate]

I'm using a method of electrolysis where the anode and cathode are in close proximity (~0.7mm) and therefore the separate collection of H2 from the cathode is very difficult. Since O2 is paramagnetic ...
7
votes
1answer
3k views

Why isn't the orbital angular momentum also considered while calculating the magnetic moments 3d transition elements?

My textbook (Chapter: The d- and f- Block Elements) makes an interesting assertion, however, without any reason to back it up. Paramagnetism arises from the presence of unpaired electons, each such ...
3
votes
0answers
84 views

Why is the spin magnetic moment for nickel(II) given as 1.7 Bohr magnetons in some references?

I read some theoretical articles concerning $\ce{Ni-O}$ system, where $\ce{Ni}$ sits at the center of the octahedron formed by $\ce{O}$. The calculated magnetic moment on the $\ce{Ni}$ sites is about $...
6
votes
1answer
416 views

NMR Splitting for Adjacent, Equivalent Hydrogens?

Why don't chemically equivalent hydrogens on adjacent carbons split the 1H NMR signal? There appears to be an answer here, but I'm having trouble understanding it because I cannot rationalize what ...
2
votes
2answers
481 views

Ring currents of anti-aromatic and aromatic systems

Why are ring currents associated with aromatic systems diamagnetic while those of anti-aromatic systems are paramagnetic? Does it have anything to do with the number of delocalised electrons 4n+2 and ...
6
votes
2answers
135 views

What are contrast agents in MRI and how do they work?

By reading some Wikipedia pages about MRI and MRI Contrast agent, I understand that contrast agents are mediums that reduce the relaxation times of the body tissues thereby increasing the contrast of ...
1
vote
1answer
746 views

Why can't diamagnetic, and paramagnetic magnetize?

Ferromagnetic materials can be made into permanent magnets. How come diamagnetic, and paramagnetic materials be made into magents? Does it have to do with the valence electrons, and how they are ...
0
votes
2answers
42k views

How to determine whether a given compound is paramagnetic or diamagnetic? [closed]

Well i am very confused whether we can determine the magnetic property of compounds.. If it us asked for elements we can say by looking at electronic configuration... For ex- how is N2O diamagnetic?...
5
votes
1answer
93 views

Coupling constant (Jab) - Why more unpaired electrons means a smaller coupling?

I hope this is not a "homework" question, but I'm having a bad time trying to figure this out. Available literature proposes 3 equations to calculate the coupling constant during a Broken-Symmetry ...
3
votes
0answers
68 views

organic chemistry and magnet

Is it possible to use magnet to influence the reaction in order to favor one outcome over the other? ie addition reaction that favor the minor.
-1
votes
1answer
69 views

From a Quantum Chemistry Point of View how can I break Bonds without Heating?

Is it possible to dissolve/break bonds using strong alternating magnetic fields at high frequency? (Perhaps from tesla coils?) Could you use resonance to cause the bond to weaken over time? If so how ...
1
vote
2answers
2k views

Metallic and magnetic nature of transition metal oxides

Which of the following oxides is both metallic and ferromagnetic: $\ce{VO2}$, $\ce{CrO2}$, $\ce{MnO2}$, $\ce{TiO2}$? This is how I went about solving it: Since ferromagnetic materials also show ...
3
votes
0answers
76 views

What are open access sources for approximate magnetic susceptibility of liquid rocket propellants?

This question asks if the comparatively large paramagnetic susceptibility of liquid oxygen (LOX) is considered when designing rocket tank and engine systems. This comment suggests fuels such as RP-1 (...
4
votes
1answer
544 views

Is there an example of a closed shell molecule with a permanent ground state magnetic dipole?

It seems that molecules of point group C$_{n}$ and C$_{nh}$ can in principle support a permanent magnetic dipole moment (Barron, 2004). However, I cannot think of any closed shell molecules that ...
1
vote
1answer
61 views

Plasma, Fourth State of Matter, and Magnetic Fields and Electric Fields [closed]

Plasma is the fourth state of matter consisting of positive atoms, and freed negative electrons. Does plasma have an electric field, and magnetic field?
0
votes
1answer
73 views

Can you make a magnetic fluid that's drinkable [closed]

I need to make a ferrofluid that is drinkable so I obviously can't use the traditional method of using iron as it is harmful. Are there any chemicals that are not harmful that can take on magnetic ...